Effects of Deep Application of Nitrogen Fertilizer on Maize Nutrient Utilization and Yield under Mulching Farmland in Semiarid Region
In this study,a field experiment was established with spring maize based on full plastic-film mulch-ing on double furrow planting.Three fertilizer placement depths(5 cm:D5,15 cm:D15,and 25 cm:D25)were set up,and surface fertilization was used as control(D0),formed four treatments.The effects of different nitrogen appli-cation depth on maize plant growth,nutrient utilization and yield were analyzed,and the effects of different nitrogen application depth on maize fertilizer utilization in dry mulched farmland were clarified.The results showed that the plant height and dry matter accumulation increased gradually with the increase of fertilization depth,and D25 treat-ment had the highest dry matter accumulation of grain,leaves,and stem among fertilization depth treatments.The nutrient content of all organs showed the order of D25＞D15＞D5＞D0.Fertilizer use efficiency and agronomic effi-ciency were significantly improved under different nitrogen application depth treatments.The grain yield under D25 treatment was significantly increased.Therefore,the nitrogen fertilizer applied to 25 cm depth can better promote the nutrients utilization and absorption of spring maize,which can be used as one of the effective measures to im-prove the utilization efficiency of fertilizer in dry farmland of film mulching farmland in semiarid regions.
万方数据
维普
