RESPON DAN EFISIENSI PUPUK FOSFOR (P) PADA BEBERAPA GALUR KEDELAI

Abstract

Soybean is one of the commodity priorities in the agricultural revitalizationprogram, announced by Indonesian government in 2005 to increase soybeanproduction. Fertilization is one of the cultural practices that are expected to giveimportant contribution in increasing soybean production. Phosphor fertilizer isneeded in cultivation of soybean plants to obtain optimal yield. The objective ofthis study are to determine the fertilizer P use efficiency in several strains ofsoybean and it’s their response. The research was conducted in the Balai BenihUtama (BBU), Pasir Pangarayan, Dalu-Dalu Village, District of Rokan Hulu. Theresearch was conducted over four months from September 2009 until Februar y2010. The research was conducted using randomized block design consisting oftwo factors. The first factor is the genotype of soybean (G) ie: line ED 13, 14 DD,19 BE, 25 EC, 11 AB. The second factor is the rate of phosphorus fertilizer infourt, namely: Without Fertilizer P 0 kg / ha, 25 kg TSP / ha (9.2 g P2O5/ plot), 50kg TSP / ha (18.4 g P2O5/ plot), 75 kg TSP / ha (27.6 g P2O5/ plot). The results ofthis study indicated that, in general application of phosphorus fertilizer at all rateswere no significant effect to the growth and yield components of soybean plants. Inaddition line 13 ED, 14 DD, 19 BE, and 25 EC were perfomed good yieldcomponent and was able to give higher number of pods and number of seed perplant than 11 AB. Fertilizer P was not able to be absorbed efficiently all genotypeof soybean.