Abstract:

For the purpose of optimum proportion of controlled-release urea (CRU) and common urea (CU) combined application , conventional applying urea as control, let five treatments, a study on the effect of CRU and CU combined application on soil nitrogen content and yield and quality of soybean. The results indicated that, CRU and CU combined application could promote soil available nitrogen and soil total nitrogen contents, soil available nitrogen contents showed a rising tendency and soil total nitrogen contents decreasing. Different proportion application of the CRU, aboveground biomass of soybean in different growth stages, especially R4 to R8, the most raising in T5. The protein increased and fat decreased, and improved soybean quality. The treatment of T3 had the highest yield, reached 3019.88 kg/hm2, increased yield by 11.33% compared with common urea application, the difference reached significant level.