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The trail is based on the experimental field of IPGR „K. Malkov“ in town of Sadovo, located in the South Central region of Bulgaria, during period 2016 / 2017-2017 / 2018. The study period is characterized by contrasting conditions, with drought in April. During the first year there are periods of drought, the second year is more rainy but with an uneven distribution of rainfall. A potential grain yield was calculated using the Edwards (2017) formula. The following analyzes were made: the arithmetic mean was calculated, the variation analysis represented by the variance coefficient; accuracy indicator, the maximum and minimum values of the signs are reported. An analysis of variance of the studied signs was performed. Homogeneity test of offspring of Triticale Rozhen cultivar was performed with the software product SPSS 19, correlation analysis, regression analysis, multiple step regression analysis, Path coefficient analysis. The length of the spike and the height of the plants are confirmed as morphological markers for the Triticale Rozhen cultivar, as they are homogeneous in progeny, have high accuracy and low variation. The spike density of triticale Rozhen cultivar can be used as an additional marker, as it is also homogeneous in offspring, with low variation over years and accuracy from high to border with good accuracy. The potential grain yield of the triticale cultivar Rohzen is formed during the trial period by the number of productive tillers / m2 (NPT/m2) and spike density, which have a positive correlation with yield. Seed yield of the triticale Rozhen cultivar is formed mainly by NPT / m2, the correlation with spike density is also positive and strong. For seed yield the overall indirect effect is strongest of the weight of kernels per spike, but is negative. [ABSTRACT FROM AUTHOR]

The productivity of grain and grain protein of the Progress durum wheat variety was studied under fertilizing systems (1. N0P0; 2. N0P80; 3. N0P120; 4. N0P160; 5. N120P80; 6. N120P120; 7. N120P160) within a long-term fertilizing experiment. It was established that the system of phosphorus fertilization alone, in rates of 80, 120 and 160 kg/ha, reduced the grain and grain protein yields to the level of a non-fertilized control variant when the available soil phosphorus (DL-method) exceeded 15 mg P2O5/100 g soil. Independent phosphorus fertilizing above 120 kg P2O5/ha significantly decreased the harvest index. The systems with nitrogen fertilization at a rate of 120 kg N/ha, at rates of phosphorus fertilization 80-160 kg P2O5/ha yielded 728 kg grain protein per hectare in average, which exceeded 3.37 times those with independent phosphorus fertilization. [ABSTRACT FROM AUTHOR]

Synthetic wheat populations (BBAuAuDD, 2n=42) originating from three crosses were grown under field and greenhouse conditions. After some observations and measurements during the vegetation, a biometric analysis of the genotypes for ten basic morphological characters was performed. Single-factor ANOVA was used to identify the significant differences between progenies in each cross, and the influence of each type of conditions on plants in both variants of the experiment. The analysis showed that seven traits differentiated progenies in cross No. 32. In the remaining two crosses the traits distinguishing plants grown under field and greenhouse conditions, were of little significance (five characteristics in cross No. 107, and two -- in cross No. 106). As the synthetic wheats were hulled forms, spike weight per plant (with or without main spike) could be a promising trait for selection of yielding synthetic genotypes under different growing conditions, as compared to other investigated features. [ABSTRACT FROM AUTHOR]

The correlations between the yield and the elements which determine it in 10 accesions of durum wheat have been studied. A positive correlation has been established between plant height and the last internode length (r=0.72). It was established that the length of the top /1 st / internode take about 40% of the total stem length. A positive correlation was found between the weight of seeds per plant and the productive tillering (r=0.81). The correlation between number of seeds per spike and weight of seeds per spike, number of spikelets per spike and weight of seeds per spike and the weight of seeds per spike and per plant is - 0.86, 0.83 and 0.76.Moderately the correlations exists between the weight of seeds from the main spike and from the rest stems and correlation between spike length and weight of seeds per spike (r=0.45 and r=0.36). A negative correlation between the weight of seeds per plant and mass of 1000 seeds was established (r=-0.51). [ABSTRACT FROM AUTHOR]