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The general principles of ovoid shapes and their mathematical interpretation were considered concerning previous data and experience. Previously, bird egg description was carried out using the composite ovoid model. According to this model, an ovoid is considered as a set of arcs with a smooth transition between them. The studied group of eggs was named true ovoid. They differ from other forms in size of their infundibular zone radius (thick end) that is almost equal to half of the diameter (0.5D ± 0.01 ˂ ri = 0.5D).We suggested that this commonality, a priori, implies the presence of an abstract geometric model, which is a satisfactory solution and logical approach for analyzing the diversity of natural ovoids. Such a model is a system of circles passing into each other. This allows, within a single system, to assign a vendor code to each form, which involves the name, geometric shape, and quantitative parameters that can be implemented in bird taxonomy.Early, 0.01 D was chosen as the model difference value and the ratio of symmetrical eggs in the analyzed database was 1.1%. In this research, we extended the difference value to 0.05 D and this covered 6.0% of the egg shapes. This is the maximum interval at which the curvature of the polar zones does not visually differ. We revealed that the variability in the egg shapes depends on the radii of curvature of the lateral and polar arcs. The larger the radius of the lateral arches, the greater the degree of freedom for variation of the lateral arches. We supposed that our data could associate any form of bird egg with its biological content. In turn, many ovoid features relevant to other natural objects can be used in bird taxonomical study.

Soil carbon sequestration plays an important role in mitigating the anthropogenic increases in atmospheric carbon dioxide concentrations. Pastures and meadows are the significant localities for the deposition of soil organic carbon (SOC). The objective was the comparison of the impact of plant species and their quality on the deposition of SOC under the grasslands in 18 variants of meadows and pastures at the original unfertilized soils, the overfertilized soils by organic fertilizers in the form of excrements and the soils after the ecological regeneration by regrassing. The plots 5, 8, 9 and 10 were used on a long-term basis as old semi-natural sheep pastures from the 15 century. We took into consideration the deposits of SOC and Nt in soil. The old semi-natural pasture proved the most intensive transformation and accumulation of SOC (even 5.60%) and the highest values were measured in the depth I (0–100 mm) soil layer, the concentrations decreased along with the depth in all treatments. At these plots, there was the lowest yield of dry matter and quality (EGQ). The yield of dry matter in t.ha−1, the number of species, EGQ and C:N in the depth I with the significant impact on the species variability, which were selected by Monte-Carlo permutation test explain up to 47% of the total variability. According to the result of “forward selection” in RDA analysis, out of all significant factors, the number of species has the biggest impact on the total species variability, which represents 17% of the total variability. The total evaluation indicates that from the agricultural aspect of utilization, a more favourable quite high content of SOC was deposited at the ecologically regenerated grasslands by the additional sowing of the valuable autochthonous plant species.

The research was aimed at assessing the effect of complementary use of slurry with soil conditioners and with NPK fertilizers on the content of crude fibre fractions in the biomass of Lolium multiflorum. The studies were conducted on the basis of a two-year (2016-2017) field experiment established in three replications in a completely randomized design. The impact of slurry and its interaction with soil conditioners and with NPK fertilizers was tested on the Dukat variety of Lolium multiflorum forage grass. The results demonstrated that there was no significant effect of the treatments on the content of crude fibre and its fraction in the grass. However, ADF and ADL fibre content varied significantly across the growing seasons. In the same growing season crude fibre content as well as the content of the ADL fraction varied across three Lolium multiflorum harvests.

The aim of the present study was to determine the effect of Tytanit foliar application, also comparing it with that of nitrogen, on the content of Festulolium braunii fibre fractions, its nutritional value and feed intake. The experiment showed that forage of better quality could be obtained by reducing the amounts of traditional nitrogen fertilisers, or excluding them and using a product containing titanium instead. The experiment commenced in the spring of 2014 in the field of the University of Natural Sciences and Humanities in Siedlce. The plant used in the experiment was the Felopa variety of Festulolium braunii. The effects of Tytanit foliar application at a concentration of 0.2% and 1% and of mineral nitrogen at a dose of 80 and 160 kg ha−1 were studied. Festulolium braunii was harvested three times a year in the period 2015–2017. The amounts of NFD, ADF, and ADL in the plant material were determined by near-infrared reflection spectroscopy (NIRS) using the NIRFex N-500. Relative feed value (RFV) and dry matter intake (DMI) were calculated. The higher dose of Tytanit supplied to Festulolium braunii contributed to an increase in NDF and ADF fraction content and a reduction in RFV and ADL fraction and DMI.

The aim of this study was to determine the suitability of lawn grasses cultivated in monoculture and fertilizated by soil conditioners to establish lawn grasses used extensively in terms of their impact on the overall aspect. The following grass species were used in the experiment: Lolium perenne, Festuca rubra and Poa pratensis. They were sown on their own, each of them at the rate of 28 g m-2. Another experimental factor tested in the research was soil conditioners – Substral, Humus Activ Papka, Eko-Użyźniacz, UG-max. At the end of each growing season between 2013 and 2015 an assessment of grass was carried out. Among other things its general appearance was assessed using a 9-point rating scale. This assessment was conducted in three seasons: spring, summer, and autumn. Obtained results showed, that lawn appearance ratings varied throughout the research, both in terms of the season, the species of grass, and soil conditioners. This proves that soil conditioner effects depend on temperature and moisture conditions, and that there is an interaction affecting grass appearance between soil conditioners and the weather conditions. Lawn grass species responded strongly to different weather conditions by changing their appearance in different seasons and years.

The aim of the research was to assess the content of protein and soluble sugars and the yield of Festulolium braunii treated with different fertilizers. The effects of Tytanit foliar application at a concentration of 0.2% and 1% and of mineral nitrogen at a dose of 80 and 160 kg/ha were studied in the experiment. When the grass was fully developed (2015&ndash, 2017), Festulolium braunii was harvested three times a year. Mineral nitrogen fertilizer in combination with Tytanit increased the yield and the concentration of proteinin the plants. Each year the highest yield was recorded on plots treated with mineral nitrogen at a dose of 160 kg ha&minus, 1 in combination with the foliar application of Tytanit at a concentration of 1%. In the 1st and 2nd years of the research, Festulolium braunii treated with one dose of Tytanit at a concentration of 1% contained more soluble sugars than plants from plots treated with nitrogen.

The purpose of the study was to evaluate the effect of distance from a road on lead and cadmium content in grass species near an expressway and to assess bioaccumulation of these elements by morphological parts of the plants. The material for the research was the following grass species in their flowering stage: Dactylis glomerata, Arrenatherum elatius, and Alopecurus pratensis. Plant samples were collected along the international E30 road, the ring-road of Siedlce, in May 2015. A 9-km road section was examined with samples collected on both sides, covering a stretch of 700 m, at the following distances from the edge of the road: 1, 5, 10, and 15 m. Five samples of each plant species and at each distance from the road were collected. Lead and cadmium concentration was determined with the AAS method. The largest amounts of Pb were absorbed by A. pratensis L. (3.843 mg kg−1DM), while the lowest by A. elatius L. (2.523 mg kg−1DM). Of the above plants, the highest amount of Cd (0.286 mg kg−1DM) was accumulated by D. glomerata L. Underground parts of the grass species accumulated greater amounts of Pb and Cd than aboveground parts. It indicates that considerable amounts of heavy metals released by expressway vehicles contaminated the soil. The highest content of Pb and Cd was found in the grass growing at a distance of 5 m from the edge of the roadway, and this applies both to underground and aboveground parts.

A three-year field experiment (52.169°N, 22.280°E), in which each treatment was replicated three times, was set up in a randomised split-plot design in the autumn of 2011. The main experimental factors were soil conditioners with the trade names such as UGmax, Eko-Użyźniacz and Humus Active Papka, which were applied on their own and with mineral fertilisers. They were applied to the soil with two forage grasses: the Bora variety of Dactylis glomerata and Lolium perenne of the Info variety. The results were processed statistically with the multi-factor analysis of variance with a significance level of P≤0.05, whereas the differences between means were verified with Tukey’s test. The Statistica 12 program was used to do all the calculations. Compared to the control, soil conditioners (UGmax, Humus Active and Eko-Użyźniacz) did not reduce carbohydrate content in grass significantly. This proves that they can be applied to grass. Combination of mineral fertilisers with soil conditioners, relative to the control, resulted in about 15% increase in digestible protein content. Comparing all the plots, without the control, the ratio of non-structural carbohydrates to protein was the most favourable in the grass from plots where UGmax or nitrogen-phosphorus-potassium (NPK) fertiliser or a combination of both was applied.

Nowadays substances stimulating growth and development of different agricultural plant species are used in intensive farming. Some of such plant growth regulators are Asahi SL and Moddus 250-EC. So far the literature dealing with growth regulators has concentrated mainly on their effects on deciduous trees. Because no data are available on how those substances affect conifer trees, this paper presents description of experiments on the effects of Asahi SL and Moddus 250-EC on the increase of tree height and branch length of Picea pungens and Thuja occidentalis. The research has proved that morphological features of the plants tested in the experiment varied according to which growth regulator was used and in what month the measurements were taken. Conifer trees sprayed with Asahi SL had a bigger yearly height growth rate and bigger growth of branches than those sprayed with the stimulator Moddus 250-EC.

Replicated three times, the research was conducted in the experimental field between 2011 and 2014. Three soil conditioners with the following trade names: UGmax, Eko-Użyźniacz, and Humus Active Papka were used in the experiment, separately or together with NPK fertilisers. They were all used on plots sown with two species of grass, Dactylis glomerata of the Bora variety and Lolium perenne of the Info variety. The plant material from both grass species was tested for the concentration of ADL fraction (% DM), cellulose (% DM), and hemicellulose (% DM). It was found that the concentration of cellulose, hemicelluloses, and the ADL fraction was significantly higher in the biomass of Dactylis glomerata than in the biomass of Lolium perenne. The grass from the plot with the UGmax soil conditioner applied had the highest amount of cellulose and hemicellulose. The lowest amount of those organic compounds was found in the grass treated with UGmax together with mineral fertilisers and in plants treated with Humus Active, together with mineral fertilisers. However, the fertilisers and conditioners did not increase the ADL content in both grass species.

Recently, there is a big interest in science to use seaweed extract in agricultural practice. Therefore, the aim of this paper was to determine the effect of foliar application of Ecklonia maxima extract on photosynthetic activity and chlorophyll content of Medicago ×varia Martyn leaves. The experimental factor was a commercial product containing E. maxima extract (Em). The following parameters were determined: maximum photosystem II efficiency (Fv/Fm) in the dark-adapted state, actual photosystem II efficiency in the light-adapted state (∆F/Fm’), the photochemical quenching coefficient (qP), the non-photochemical quenching coefficient (qN), chlorophyll content determination. The Fisher-Snedecor test was used to determine whether the impact of experimental factor was significant, while the value of the HSD0.05 was calculated with Tukey’s test. As a reaction to the particular conditions during the experiment alfalfa treated with Em had a better efficiency of the photosynthetic apparatus in relation to the control. Algae extract used on hybrid alfalfa leaves caused a 12.4% increase of Fv/Fm parameter, from 0.565 on the control to 0.635. The value of the actual efficiency of photosystem II (∆F/Fm) determined under the same conditions turned out to be about 20% higher for plants treated with the extract. Chlorophyll a and b concentration, as a response to the extract, increased by 12% and 16.7%, respectively. The experiment showed that periods of rainfall shortages did not reverse the effect of the extract on plants, with an increase in chlorophyll a and b content during the growing seasons with dry and extremely dry months.

The study was focused on the impact of an extract of Ecklonia maxima on selected morphological features of yellow pine (Pinus ponderosa Dougl. ex C. Lawson), prickly spruce (Picea pungens Engelm.) Variety Glauca, thuja (Thuja occidentalis) variety Smaragd. The experiment was established in April 12, 2012 on the forest nursery in Ceranów. April 15, 2013 was introduced research agent in the form of a spraying an aqueous solution extract of Ecklonia maxima with trade name Kelpak SL. Biologically active compounds in the extract are plant hormones: auxin and cytokinin. There were studied increment in plant height, needle length of yellow pine, twigs length in prickly spruce and thuja. The measurements of increment in length of twigs and needles were made in each case on the same, specially marked parts of plants and have carried them on the 27th of each month beginning in May and ending in September. The results were evaluated statistically using the analysis of variance. Medium differentiations were verified by Tukey's test at a significance level p ≤ 0.05. The study showed that the diversity of traits features in the experiment was depended on the extract, the tree species and the measurement time. The best results after the extract using showed a pine and spruce. Seaweed preparation contributed to increment increased of trees height for in the pine and spruce and the needles length of pine and twigs of spruce. The species showing no reaction to the extract was thuja.

The aim of the research was to determine the relationship between application of various concentrations of Ecklonia maxima extract and development of some morphological features, the SAD index as well as selected organic compound content in Festuca pratensis and Lolium perenne. The experiment was replicated three times and the following concentrations of the extract were used: control, 0.04, 0.4, 4.0 and 40%. 40 days after the extract was sprayed on the plants the following measurements were taken: the number of shoots, the length of leaf blades, the width of the leaf base, the relative chlorophyll index SPAD, and the amount of biomass. The content of protein compounds, simple sugars, lignin, cellulose and hemicellulose were determined after the harvest. The research showed that there was a relationship between a higher concentration of the extract and a higher number of shoots, longer leaf blades and an increase in their width. In consequence of those changes the amount of biomass also increased. The plants sprayed with higher doses of extract had a higher SPAD index, a higher concentration of both protein compounds and simple sugars, and a lower concentration of cellulose, lignin and hemicellulose.

The aim of this paper is to evaluate the effect of liming and various doses of municipal sewage sludge (5, 10, and 15% of the weight of the soil) on cobalt total content and its speciation. The incubation experiment lasted 420 days and was conducted in controlled laboratory conditions. Soil was sampled after 30, 60, 90, and 120 days and then, with a break of 180 days, after 360 and 420 days. In all samples, cobalt total content was determined by means of ICP-AES (emission spectrophotometer), and fractions of this metal were measured with the seven-step Zeien and Br&uuml, mmer method, with seven of them separated: F1&ndash, easily soluble, F2&ndash, exchangeable, F3&ndash, bound to MnOx, F4&ndash, bound to organic matter, F5&ndash, bound to amorphous FeOx, F6&ndash, bound to crystalline FeOx, and F7&ndash, residual. Compared to the control, the average content of total cobalt in the soil increased more than two times in experimental units with higher doses of sewage sludge (10% and 15% of the weight of the soil). The metal was mainly bound to the residual fraction, where it constituted 40% of its total content, while in the organic fraction, its share was 20%. In the soil incubated with sludge, cobalt in mobile fractions constituted a small percentage of its total content. Liming limited the release of this metal.

In 2011 a study was carried out analyzing the effects of road traffic on bioaccumulation of zinc and copper in selected species of dicotyledonous plants growing on adjacent grasslands. To do the research the plants were sampled from the 9-km-long Siedlce bypass, a part of the international route E-30. They were collected during the flowering stage, at following distances from the road: 1, 5, 10, 15 m. The content of zinc and copper was determined with the AAS method, with dry mineralisation done before. The highest concentration of the elements, regardless of the distance from the road, was found in Taraxacum spec. Among the tested plants, the lowest zinc content was in Vicia cracca, and the lowest copper content in Rumex acetosa. The limit for copper content was exceeded in Taraxacum spec. and, slightly, in Achillea millefolium growing at the roadside, closest to the roadway.

In the study the physicochemical properties of selected municipal sewage sludge were compared using the reports on waste generation from the years 2007–2012 in the Mazovia voivodship. The selection was done on the basis of different methods of sludge processing and the number of equivalent inhabitants (NEJ) supported by sewage. Physical and chemical properties of municipal sewage sludge were significantly dependent on the method of purification and treatment methods. These sludges were characterized by a high content of organic matter and macronutrients. The amount of heavy metals (Pb, Cd, Cr, Cu, Ni, Hg and Zn) were within acceptable standards for municipal sewage sludge used in agriculture. Municipal sewage sludge treated by biological method with higher nutrients removal did not create bacteriological danger and were used in agriculture, generally to the cultivation of all agricultural products. Sewage sludge sanitized with lime and subjected to anaerobic digestion did not meet bacteriological standards, which eliminated their use in agriculture.

The aim of this paper is to analyze yield variation of Dactylis glomerata and Festuca pratensis varieties grown on organic and mineral soil. This paper has drawn on two field experiments set up and carried out between 2010 and 2013. The experiment was conducted in two experimental stations: one in the Research Centre for Cultivar Testing in Krzyżewo and the other in the Experimental Stations for Variety Testing in Uhinin. The experiment in Krzyżewo was set up on ploughed soil, with spring barley as a forecrop. In Uhnin the experimental plots were located on peat meadow. The experimental plots were sown with varieties of Dactylis glomerata: Niva, Tukan, Amila, Crown Royale and with varieties of Festuca pratensis: Limosa, Pasja, Anturka, Amelka. The full exploitation of Dactylis glomerata varieties was due between 2012 and 2013, whereas for Festuca pratensis it was due between 2011 and 2012. In the experimental plots with the varieties of Dactylis glomerata the grass was harvested six times a year and chemical analysis of the biomass was done taking dry matter only from five cuts. The varieties of Festuca pratensis were harvested four times. Each year in the course of the experiment fresh and dry matter of each cut were weighed. The grass species and their varieties as well as the particular mowing and kind of soil where the grass was grown have an impact on the yield. On mineral soil the yield of Dactylis glomerata was higher than Festuca pratensis. On organic soil the yield of both species was similar. During the two years of experiment the highest yield among Festuca pratensis varieties was noted for Amelka whereas among varieties of Dactylis glomerata the yield was similar and differences were not statistically significant.

In 2013 a field experiment was set up in order to determine the effect of Ecklonia maxima extract on the development of the aboveground biomass of alfalfa (Medicago X Varia T. Martyn). The main experimental factor was a biostimulant based on the extract containing plant hormones. The extract was applied to the experimental units in the form of spraying. The following features were determined in the experiment: plant density, the number of shoots per square meter, dry matter weight per square meter, and the ratio of leaves to the entire biomass. The results were processed statistically with the analysis of variance, while differences between means were verified with Tukey's test (p ≤ 0.05). Furthermore, the Pearson linear correlation coefficient and the coefficient of determination were calculated in order to determine the relationship between the number of plants and shoots per area unit and biomass weight. Extract application led to an increase in shoot length and density, and the weight of dry matter in individual harvest, but it did not affect plant density and the ratio of alfalfa leaves. However, a decrease of plant density in consecutive years was observed.

The aim of the experiment was to determine the effects of synthetic auxin and cytokinin and the time of their application on some morphological and physiological characteristics of Medicago x varia T. Martyn grown under controlled conditions. The experiment was to check whether an application of exogenous hormones during vegetative and generative stages of the plant had an effect on above-ground mass development, on nitrate reductase activity and on plastid pigments content. Experiment factor was synthetic auxin and cytokinin and the date of their application. Auxin was applied in the form of a synthetic indole-3-butyric acid, while cytokinin was sprayed as synthetic 6-benzylaminopurine. The control plants were treated with distilled water. Depending on the experimental variant, spraying was applied at the sixth true leaf stage and at the first flower bud stage. The research showed that the response of the alfalfa plants to the application of cytokinin and auxin was not uniform. It seems that the most effective was the application of a mixture of them both but only during the vegetative stage.Additionally, cytokinin caused an increase in plastid pigments content in alfalfa leaves. On the other hand, a mixture of auxin and cytokinin triggered the highest nitrate reductase activity in alfalfa roots and raised the ratio of total chlorophyll content to carotenoids. Synthetic auxin caused the decrease of the levels of most parameters compared to the control. Keywords: Auxin, Cytokinin, Biometrics, Nitrate reductase, Pigments

The effect of traffic on the content of lead and cadmium in grass morphological parts-leaves, shoots, and inflorescences-was studied. The samples were taken on a part of the European route E30 (Siedlce by road). The following plants were tested: Dactylis glomerata, Arrhenatherum elatius, and Alopecurus pratensis. During the flowering of grasses, the plant material was collected at distances of 1, 5, 10, and 15 m from the edge of the road, on the strip of road with a length of 9 km. In the collected plant parts, the content of lead and cadmium using the atomic absorption spectroscopy (AAS) method was determined. The effect of distance from the road on the content of lead and cadmium was evaluated using regression equations. Average lead content in the above parts of tested grass species was 3.56, while cadmium 0.307 mg kg(-1) dry matter (DM). Lead content in plants of Alopecurus pratensis (average 4.11 mg kg(-1) DM) was significantly higher than in other grasses. The lowest cadmium content, significantly different from the other species, was found in plants of Arrhenatherum elatius (0.251 mg kg(-1) DM). Distance of sampling sites from the roadway significantly affects the differences in the content of cadmium and lead in plants. Analyzed aboveground plant organs of studied grasses were significantly different in contents of lead and cadmium. There were species differences in the proportions of cadmium concentration in various organs of plants. The obtained results indicate the possibility of species composition selection of grassland sward in areas with a higher risk of heavy metals associated with dust sedimentation.

The aim of study was to compare the effects of two growth regulators on selected morphological features of yellow pine. In April 2012, 9 plants of yellow pine Lawson variety were planted to the soil. In April 15, 2013 a research agent in a form of following growth regulators: Asahi SL and Moddus 250-EC was introduced. There were the following experimental objects: C – control (only water spraying), As – Asahi spraying, Md – Moddus spraying. The tested features were: increase in plant height (cm), the increase in needle length (cm) of yellow pine. Measurements of increases in length of needles were made in each case on the same specially marked parts of the plants and performed on 27th of each month from beginning of May to ending of September. Among the used of growth regulators the greatest influence on the height increase of the tested trees as well as on the needle length of yellow pine more affected regulator Moddus. The largest total increase in the needles length of yellow pine was on the object with Modus and Asahi, and on control object it was significantly lower than on objects with growth regulators.

In order to determine the impact of improved microbiological preparations of soil on the development of the aboveground biomass of red clover (Parade variety) in the 2012-2013 year, field experiment with cultivation of this species was conducted. Experiment factors were three preparations containing composition of soil microorganisms (trade name: UGmax, Humus Active and Ekoużyźniacz). All study objects were carried out in triplicate. The analysed features were: green and dry matter of plant (kg • m-2), plant height (cm), number of shoots (unit • m-2), share of leaves and stems in biomass (%). The plants were cut three times, and collections of fresh weight were carried out at the beginning of flowering, i.e. when in 30-50% of the plants from plots the flower buds bloomed. The results were statistically analysed using analysis of variance. The study shows that the effects of biopreparations were dependent on the type of preparation and cut. Also, the meteorological conditions during the growing season of each research year were highly significant. The highest values of the analysed parameters were obtained for the plants that were sprayed using aqueous solutions of UGmax and Humus Active. There were no clear effects of soil fertilisers on the biomass structure expressed as the percentage of leaves and stems

This experiment was carried out in laboratory conditions. The aim of this work was estimating allelopathic potential of Taraxacum officinale on seeds germination and initial growth of Poa pratensis. In the experiment different concentration of soil’s and plant’s water solution obtained from common dandelion were employed. The inhibition of germination energy of Poa pratensis under the influence of plant extracts produced from roots and leaves of Taraxacum officinale was found. Germination availability was inhibited in a higher degree by extracts prepared from the leaves than the roots of Taraxacum officinale. Higher concentrations of all solutions of both the soil and the plant inhibited the length of seending of Poa pratensis.

Entomopathogenic fungi are the largest group of microorganisms existing in the soil environment. Occurrence and pathogenicity of entomopathogenic fungi in soil is dependent on many factors affecting the soil environment. The aim of this study was to compare the species composition and the intensity of the occurrence of entomopathogenic fungi in soils from monoculture crops of Festuca pratensis Huds. The study material consisted of soil samples taken from the experiment conducted in two experimental stations of the Research Centre for Cultivars Study. The insecticides fungi were isolated from soil using a method of the selective substrate. Three species of entomopathogenic fungi Beauveria bassiana, Isaria fumosorosea and Metarhizium anisopliae were isolated from the study soils using the selective medium.

In a pot experiment conducted in a greenhouse, the effect of CCC Bercema growth inhibitor to reduce vegetative shoot growth of perennial ryegrass and cocksfoot was studded. The experiment was set up in triplicate. Growth regulator was applied once, in a form of an aqueous solution. The following experimental objects were specified: control object, Bercema with a concentration of 10%, 20% and 30%. Ten measurements were performed every 3 days. The study was conducted under conditions of 12-hour artificial light daily. The results were statistically analyzed using two-factorial variance analysis . It was found that the greatest shoot growth reduction of ryegrass due to the highest inhibitor concentration (B- 30%), but for cocksfoot under the influence of the minimal concentration (B- 10%), compared to the control object. It has been noted that cocksfoot is more sensitive to the applied growth regulator, resulted in significantly greater inhibition of shoot regrowth than for ryegrass. In the experiment with the perennial ryegrass significant differences in the growth of shoots were found under the influence of inhibitor application at a concentration of 30%, compared to the control object. In the case of cocksfoot, all the concentration increases of Bercema inhibitor significantly differentiated the shoots regrowth.