Abstract
ABSTRACT In order to explore a fertilization scheme that can adapt to different soil fertility conditions and wheat varieties, two kinds of controlled-release ureas with different release periods (60 days (CRU-60 d) and 90 days (CRU-90 d)) blending with ordinary urea were applied in different proportions at three different sites to evaluate the impacts of controlled-release bulk blending fertilizer (CRBBF) on soil NO3 –N, NH4 +-N contents and dynamic change of tillers, SPAD value, grain yield and yield components. The results indicated that applying CRBBF could increase soil NO3 –N, NH4 +-N contents, tiller numbers, leaf areas, leaf SPAD values and grain yield. Compared with local farmers’ habitual fertilization treatment, CRBBF application presented a higher soil inorganic N content, yield with more spikes and grains per spike. This study has important guiding significance for one-time fertilization of wheat and provides an effective way to alleviate the non-point source pollution caused by excessive fertilization.
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