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Palm oil can produce high productivity which must be supported from several aspects, one of them is a good and correct nursery. Palm oil nursery isusually carried out conventionally, namely planting using soil media. Hydroponic research using cocopeat and rice husks planting media on the growth of palm oil seeds in pre nursery has never been carried out. The objective of this study was to determine the growth of palm oil seedlings using the hydroponic method. This research was conducted in the STIPAP Medan greenhouse. This research was conducted from April to July 2018. This research was a non-factorial RAK, which consisted of four treatments, namely M0 (top soil), M1 (Cocopeat), M2 (rice husks), M3 (combination). Height, stem, number of leaves, dry and wet weight of roots and plants, root length were observed. Then data analysis with ANOVA with the continued test of 5% Duncan was performed. The results of the effect of cocopeat and rice husk media was there was no a significant effect on the treatment parameters of seed height, number of leaves, dry and wet weight of roots and plants, and root length.

The availability of topsoil which is relatively fertile to use as seedling media is more and more limited so that the low nutrient degraded soil become alternative media for tree seedling nursery. The purpose of the research was to get the combination of degraded soil media mixture for nyawai ( Ficus variegata ) seedling media in nursery. The degraded soil collected in the heavy ero d ed soil in Rumpin Villages, Rumpin Sub District, Bogor. Completed random design with factorial was used to test the media mixture treatments and NPK fertilizer dosages on the growth of nyawai seedling. A pair of leaves seedlings was transplanted on 5 media treatments, i.e. top soil, degraded soil, degraded soil 70 % + compost 30 % (v:v), degraded soil 90 % + rice husk charcoal 10 % (v:v), and degraded soil 60 % + compost 30 % + rice husk charcoal 10 % (v/v). The dosage of NPK fertilizer was used as much: 0 g, 0.5 g polybag, and 1.0 g/polybag. The result showed that interaction of media and NPK fertilizer dosages was only affected on seedling biomass parameter. The interaction treatment of t he mixture media of degraded soil 60 %, compost 30 % and rice husk charcoal 10 % could increase the growth of nyawai seedlings high by 30.60 % and fertilizer treatment of 1 g NPK could increase seedling biomass 6.21 g. The mixture media and fertilizing treatment by NPK 1 g can be alternative media on nyawai nursery. Keywords: Ficus variegata , soil media, seedlings, growth

Main nursery is the first step affecting oil palm’s age and productivity. Good plant growth will produce high quality and yield of oil palm. The demand of oil palm seedlings for extensification and replantation increases continuously, and therefore this need to be supported by precise fertilization programs. The objectives of this experiment were to investigate the role of organic fertilizer and to obtain the best organic-NPK fertilizer combination in increasing the effectiveness of the use of NPK fertilizer for the growth of oil palm (Elaeis guineensis Jacq.) seedling in the main nursery. The experiment was conducted from December 2011 to September 2012 at IPB Teaching Farm Dramaga Bogor. The treatment was arranged in a factorial randomized block design with three replications. The first factor was amount of organic fertilizer consisted of 0:6, 1:6, 2:6, and 3:6 of the soil volume (6 kg). The second factor was NPK fertilizer rates, i.e., 0.0, 127.5, 255, and 382.5 g NPK per plant. The results showed that application of organic fertilizer increased the effectiveness of NPK fertilizer and could be a substitute for NPK fertilizer in oil palm seedlings. The best combination treatment was 2:6 (organic fertilizer:top soil) and 382.5 NPK g per plant with effectiveness of 158.9, 209.1 and 170.1 % for plant height, leaf number and stem diameter, respectively. The efficiency of N, P, and K application were 56.2, 11.1, and 29.0% for the same variables, respectively. Based on morphological variables, recommended rate of an NPK compound fertilizer 15-15-15 was in the range of 396.05 g per seedling for eight months. Recommended NPK were 7.00, 12.59, 37.58, 56.41, 36.74, 87.00, 86.60, and 72.97 g per seedling for first to eighth months, respectively.Keywords: chlorophyll, fertilizer recomendation, morphological and physiological response, nutrient balance

To support t he cultivation of yellow c empaka (Michelia champaca) intensively , high quality seedlings was needed . One of the factors that affect the growth and quality of seedling was growth media. Th e objectives of the research were to (1) determine the effect of saw dust and rice husk as growth medi a than the top soil for yellow c empaka seedlings; (2) obtained the best composite media between top soil with saw dust and rice husk as media for growth medi a for yellow c empaka seedlings. The research was conducted in greenhouse, started from January to April 2013. The experiment used Completely Randomized Design (CRD ) with 6 treatments and 3 replicates, every experiment unit consisted of 6 yellow c empaka seedlings so the total number amounted to 108 seedlings. The treatment were number of medias (1) top soil; (2) saw dust; (3) rice husk; (4) top soil + saw dust 1:1; (5) top soil + rice husk 1:1; (6) top soil + saw dust + rice husk 1:1:1 . Observed variables include high growth, diameter, number of leaves, root length, top root ratio, total dry weight and seed ling quality index . The results showed that growth media of rice husk gave a good growth of yellow cempaka same as media top soil. Composite growth media that had a better growth of yellow cempaka seedling was composite growth media top soil + rice husk 1:1.

Kadam is one type of fast growing trees species. One of the factors that affect plant growth are nutrients , the use of organic fertilizer such as cow manure compost soil mix additive during planting can increase nutrient substances in the soil that plants need for growth. The purpose of this experiment was to study the growth response of kadam seedling at different mixing ratio betwen soil with cow manure compost at seedling growth media and the best comparison of soil mixed with cow manure compost where g a ve the best effect on the growth of kadam seedling. The experiment was conducted from March until June 2012 in the nursery PT Subur Anugrah Sejahtera, District of K aur, Sub District Air Palawan. The method used in this experiment was randomized block design (RBD) with 5 groups and 5 treatments. Treatment of this experiment w e re growth media consisted of top soil, top soil + compost (1:1), top soil + compost (1:2), top soil + compost (1:3) and top soil + compost (1:4). Each experimental unit consisted of 10 seedlings. Similarity variety tested with Bartlett test, then performed analysis of variance and comparison of average values between treatments with HSD test, all the tests done at 5% significance level . The results showed that composition of soil and cow manure compost significantly affect to height, seedling height, dry weight of root, and seedling quality index. Composition of soil and cow manure compost 1:2 resulted the best of high growth , seedling high, dry weight of root, and the best seedling quality index respectively 42.64 cm, 40.56 cm, 10.22 g, and 8.73 g. For further research recommended to conduct the same study by replacing the type by cow m a nure compost white chiken manure compost as a growth media seedling so, can obtain new knowledge about the type of compost with for growth media.

As agricultural waste, rice straw could be used to substitute potassium fertilizer in food crops farming system, especially rice crop. The use of rice straw in rainfed lowland areas is not significant to substitute potassium fertilizer which is relatively higher cost. The field experiment was conducted to determine potassium uptake pattern of rainfed lowland rice in light textural Endoaquepts through using straw and inorganic fertilizers. The experiment was arranged using split plot design where rice straw as main plot and potassium fertilizer as subplot. The variable observed was agronomic variable, potassium uptake, exchangeable potassium. The straw incorporation into soil increased the higher exchangeable potassium content in topsoil and also could reduce K losses due to leaching. The peak of K uptake was occurred at panicle initiation growth phase and gradually declined at reproductive growth phase. Interaction between rice straw and potassium fertilization increased significantly grain yield of 0.93 – 1.39 t/ha. The increase of potassium rate and its application method did not influence significantly grain yield of Ciherang variety.