Key word : Biosulpho, fertilizer horticulture, Alfisol, Entisol, Vertisol
By: Sudadi, Sumarno & Jaka Widada
This research is the second year of two years research aimed to evaluate the effectivity of Biosulpho fertilizer pellet in supplying P and S nutrients for growth and high yield of onion and soybean at field experiment. The experiment were conducted at Sukasari, Jumantono, Karanganyar district for Alfisol, at Palur, Mojolaban, Sukoharjo district for Entisol and at Pungkruk, Sragen district for Vertisol. The treatment of these field experiment were the formulas of biosulpho fertilizer taken from the first research which gave the highest yield of red onion and soybean at each soil type. The treatment of each experiment for red onion AS plant indicator were as follow : B1 (900 kg/ha BF60 J11, 0 ton/ha BO), B2 (450 kg/ha BF60 J11,10 ton/ha BO), B3 (900 kg/ha BF80 J11,0 ton/ha BO), B4 (450 kg/ha BF80 J11,10 ton/ha BO), SP-36 (450kg/ha SP-36,10 ton/ha BO) and control treatment at Alfisol, B1 (900 kg/ha BF60 J11, 0 ton/ha BO), B2 (900 kg/ha BF60 J11, 5 ton/ha BO), B3 (900 kg/ha BF80 J31, 0 ton/ha BO), B4 (900 kg/ha BF80 J31, 5 ton/ha BO), SP-36 (450kg/ha SP-36, 5 ton/ha BO) and control treatment at Entisol, B1 (450 kg/ha BF60 J11, 10 ton/ha BO), B2 (900 kg/ha BF60 J11, 10 ton/ha BO), B3 (450 kg/ha BF80 J11, 10 ton/ha BO), B4 (900 kg/ha BF80 J11, 10 ton/ha BO), SP-36 (450kg/ha SP-36, 10 ton/ha BO) and control treatment at Vertisol. For soybean were : B1 (900 kg/ha BF60 J11, 5 ton/ha BO), B2 (450 kg/ha BF60 J11, 10 ton/ha BO), B3 (900 kg/ha BF80 J11, 5 ton/ha BO), B4 (450 kg/ha BF80 J11, 10 ton/ha BO), SP-36 (450kg/ha SP-36, 5 ton/ha BO) and control treatment at Alfisol, B1 (450 kg/ha BF60 J31, 5 ton/ha BO), B2 (900 kg/ha BF60 J31, 5 ton/ha BO). B3 (450 kg/ha BF80 J31, 5 ton/ha BO), B4 (900 kg/ha BF80 J31, 5 ton/ha BO), SP-36 (450kg/ha SP-36, 5 ton/ha BO) and control treatment at Entisol, and B1 (450 kg/ha BF60 J11, 5 ton/ha BO), B2 (900 kg/ha BF60 J11, 0 ton/ha BO), B3 (450 kg/ha BF60 J31, 5 ton/ha BO), B4 (900 kg/ha BF60 J31, 0 ton/ha BO), SP-36 (450kg/ha SP-36, 5 ton/ha BO) and control treatment at Vertisol respectively. Each experiment arranged in randomized completely block design with single factor and replicated three times for each treatment. The variables observed were soil available-P and S, P and S uptake and plant yield. Data analyzed with F test at 5% of level significant followed by Duncan Multiple Range Test if there were any significant influences.
The result indicate that biosulfo fertilizer may supply P and S nutrients for onion and soybean as good as SP-36 fertilizer was, and also plants yield. The treatment with highest red onion yield were : B4 (450 kg/ha BF80 J11,10 ton/ha BO) at Alfisol, B3 (900 kg/ha BF80 J31, 0 ton/ha BO) at Entisol and B4 (900 kg/ha BF80 J11, 10 ton/ha BO) at Vertisol. While for highest soybean yield the treatments were : B4 (450 kg/ha BF80 J11, 10 ton/ha BO) at Alfisol, B1 (450 kg/ha BF60 J31, 5 ton/ha BO) at Entisol and B3 (450 kg/ha BF60 J31, 5 ton/ha BO) at Vertisol. These formulas of biosulfo need more improvement to make them convenient formula for application