关键词: 啤酒大麦, 减量施肥, 产量, 品质

Abstract: In order to optimize northwest beer barley fertilization measures, this paper studied the effects of reduced fertilization on the growth, dry matter accumulation, yield, quality and fertilizer utilization of high-yield and high-quality beer barley ‘Ganpi 7’ selected by Gansu Academy of Agricultural Sciences.  4 treatments were set up including T1(N 0 kg·hm-2+P2O5 0 kg·hm-2), T2 (N 50 kg·hm-2+P2O5 50 kg·hm-2),  T3 (N 100 kg·hm-2+P2O5 100 kg·hm-2) and local conventional fertilization (N 150 kg·hm-2+P2O5 150 kg·hm-2) as a control (CK). The results showed that with the reduction of fertilization amount, the growth period of beer barley was advanced. The plant height, ear length and stem length increased, and the dry matter quality of leaves, leaf sheaths, stems and grains were lower than the control, resulting in both grain yield and net income were  significantly lower than the control. With the increasing of fertilization reduction, the reduced fertilization improved the agronomic efficiency of nitrogen and the partial productivity of nitrogen fertilizer, saved the fertilizer application rate and improved the fertilizer utilization efficiency and grain quality,  the grain protein content decreased, 1 000-grain weight increased, fullness (abdominal diameter ≥2.5 mm) increased. The comprehensive results showed that proper reduction of fertilizer application was one of the ways to improve the fertilizer utilization rate. However, if the fertilizer application was too low, the yield would be seriously reduced. T3 had no significant effect on the net income, which can not only reduced the fertilizer input, but also improved the utilization of fertilizers and grain quality of beer barley. Above results provided the theoretical and technical basis for achieving the goal of zero growth of fertilizer.

Key words: barley, reducing fertilization, yield, quality