ABSTRAK, and a mixture of those three microbes (ABC) were used as biofertilizers, and applied directly on plant grown in pots. Randomized Block Design (RBD) was used in this experiment with six treatments and four replicates. The measured parameters were nitrogen (N) uptake, N derived from the soil, N derived from fertilizer, and plant dry weight. These parameters were determined at 20 days after planting. N derived from biofertilizer and N derived from soil were determined by N-15 isotope technique. The results showed that ABC treatment most significanly increase the total N plant (142,42%) and plant dry weight plant (129.03%) by the control plant. Based on N-15 isotope technique analysis showed that the significantly contribution to increase N plant was found in ABC treatment (67.92%).
Sidenuk rice is a superior rice variety produced by BATAN through a radiation mutation technique. The new varieties that have been produced need to be supported by efforts to optimize production through fertilization technology. The purpose of this study was to determine the effect of organic fertilizer which can increase growth, production and reduce the use of urea fertilizer in lowland rice optimally. The study was conducted using a completely randomized design. Each was repeated 4 times so that the total experimental unit (pot) was 32 rice pots. The treatments include (1) Control (without urea fertilizer), (2) Control (+) 100% urea, (3) 50% urea, (4) Local microorganisms (MOL), (5) Compost, (6) Biochar , (7) Azolla, (8) Mol + Compost + Biochar + Azola + SP 36 and KCl. The results showed that the highest grain weight was found in the 100% urea treatment, which was 43.97 g plant-1. MKBA treatment (MOL fertilizer, compost, biochar, azolla) showed values that were not significantly different from 100% urea treatment. Organic fertilizer formula (MOL fertilizer, compost, biochar, azolla) can reduce the use of urea fertilizer by 50%.
Penelitian ini dilakukan untuk menguji pengaruh dari biochar yang berasal dari cangkang kelapa sawit dan juga keefektifan bakteri penambat N pada tanaman padi sawah varietas MIRA 1, dengan menggunakan teknik isotop 15 N. Rancangan penelitian yang digunakan yaitu Rancangan Acak Lengkap dengan 3 ulangan. Perlakuan yang diberikan meliputi K0 = Kontrol; K1 = NPK; B1 = Biochar 2 t ha-1 ; B2 = Biochar 4 t ha-1 ; B3 = Biochar 2 t ha-1 + NPK; B4 = Biochar 4 t ha-1 + ½ NPK; B5 = Biochar 2 t ha-1 + pupuk hayati ABC; B6 = Biochar 4 t ha-1 + pupuk hayati ABC; B7 = Biochar 2 t ha-1 + pupuk hayati ABC + ½ NPK; B8 = Biochar 4 t ha-1 + pupuk hayati ABC + ½ NPK; B9 = pupuk hayati ABC. Hasil penelitian menunjukkan bahwa pemberian perlakuan B8 (biochar 4 t ha-1 disertai dengan pupuk hayati ABC dan NPK ½ rekomendasi) mampu memberikan nilai serapan N dan hasil tanaman tertinggi. Teknik 15 N menunjukan bahwa sumbangan N tertinggi diperoleh dari perlakuan pupuk K1 (pemupukan NPK 100%). Biochar pada sawah memiliki efek pada peningkatan berat kering biji dan jerami, dan jika disertai dengan pupuk hayati, formula ABC + biochar dapat mengurangi penggunaan pupuk NPK hingga 50%.
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