Abstract:

Basing on optimum fertilzer level, dry matter accumulation, yield and nitrogen efficiency of soybean
were studied at nitrogen management of nirogen fertilizer. There were three methods of monitrogen
management in the experiment. As follow, the total basal fertilizer (N1), half of rate as basal fertilizer combined
with the half of N rate as topdressing in the florescence stage (N2), half of rate as basal fertilizer combined with
the quarter of N rate as topdressing in the florescence stage and quarter of N rate as topdressing in the seed
filling stage (N3). The results showed that the speed of dry matter accumulation of soybean was higher from
florescence stage to seed filling stage. In all the period, which was accounted for over per 40. The dry matter
accumulation of N3 was highest among the different applying methods. The effect of different applying methods
on yield of soybean was following: N3＞N2＞N1. The nitrogen efficiency of N3 was highest among the different
applying methods. As far as partial factor productivity(PFP) for different applying methods, N3＞N2＞N1. The
results further indicated that applying nirogen method was one of the key factors on increase effective
utilization of nitrogen fertilzer and yield.