关键词: 夏玉米, 水肥一体化, 减氮, 氮素偏生产力

Abstract: In order to study the influence of water-fertilizer Integration on growth of summer maize in Central Region of Shandong province, five treatments were conducted including non-nitrogen (CK), reduction of nitrogen of water and fertilizer integration (W1N1), normal nitrogen of water and fertilizer integration (W1N2), reduction of nitrogen of conventional fertilizer and water management (W2N1), normal nitrogen of conventional fertilizer and water management (W2N2). The growth, nitrogen absorption and utilization of maize were investigated under different treatments. The results showed that: the grain yield, panicle number and 1 000-grain weight of maize in fertilization treatments were higher than those in no fertilization treatment. Under the same nitrogen application rate, the treatments of water and fertilizer integration could significantly increase corn grain yield, shoot biomass and total nitrogen accumulation of maize. The accumulation of dry matter, the absorption and accumulation of nitrogen after flowering in W1N2 treatment were significantly increased . The nitrogen transport amount and nitrogen transport rate in W1N1 treatment were increased. Compared with CK, the nitrogen transportation amount and transportation rate of nitrogen in W1N1 treatment were increased by 120.51% and 72.78%, respectively. In W1N1 treatment, the grain yield was higher, and the nitrogen transport efficiency, nitrogen partial productivity and nitrogen agronomic utilization efficiency were improved. So, the suitable reduction of nitrogen rate under water-fertilizer integration could not only enhance nitrogen use efficiency, but also high yield.

Key words: summer maize, water-fertilizer integration, reduce nitrogen, the partial nitrogen productivity