With increasing costs of chemical fertilizers, using organic amendments is an alternative method
for the improvement of crop production and soil fertility maintenance. This study aimed to determine
the effects of different organic amendments on soybean plant growth and grain yield. The eight treatments
were arranged in an RCB design with three replications. Treatments were a combination of chemical
fertilizer (16-20-0) 60 kg ha-1and extracts of jatropha 20 cc, chitosan 60 cc and fish waste 40 cc in 20 l
of water; chicken manure 3 ton ha-1; jatropha cake 3 and 6 ton ha-1; chemical fertilizer (16-20-0) 180 kg
ha-1 and control (no application). The field experiment was conducted at the National Corn and Sorghum
Research Center, on a site with Pakchong series soils during the dry season in 2007 (DS) and the wet
season in 2008 (WS). In DS, soybean applied with chemical fertilizer produced the highest grain yield
(1755 kg ha-1). In WS, however, amendment with 3 ton of jatropha cake substantially increased grain
yield (5410.83 kg ha-1) over other treatments, followed by jatropha cake 6 ton (4331.67 kg ha-1) and
chemical fertilizer (4190.83 kg ha-1). Other organic extract applications produced similar grain yield
production as the control.
With increasing costs of chemical fertilizers, using organic amendments is an alternative method
for the improvement of crop production and soil fertility maintenance. This study aimed to determine
the effects of different organic amendments on soybean plant growth and grain yield. The eight treatments
were arranged in an RCB design with three replications. Treatments were a combination of chemical
fertilizer (16-20-0) 60 kg ha-1and extracts of jatropha 20 cc, chitosan 60 cc and fish waste 40 cc in 20 l
of water; chicken manure 3 ton ha-1; jatropha cake 3 and 6 ton ha-1; chemical fertilizer (16-20-0) 180 kg
ha-1 and control (no application). The field experiment was conducted at the National Corn and Sorghum
Research Center, on a site with Pakchong series soils during the dry season in 2007 (DS) and the wet
season in 2008 (WS). In DS, soybean applied with chemical fertilizer produced the highest grain yield
(1755 kg ha-1). In WS, however, amendment with 3 ton of jatropha cake substantially increased grain
yield (5410.83 kg ha-1) over other treatments, followed by jatropha cake 6 ton (4331.67 kg ha-1) and
chemical fertilizer (4190.83 kg ha-1). Other organic extract applications produced similar grain yield
production as the control.
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