Excessive fertilization has negative influence on yield and quality of barley Ganpi No.7

Aiming to understand the effects of fertiliziation amounts on the yield,quality and fertilizer utilization rate in malting barley Ganpi No.7,in Huangyang town of Gansu province,we conducted a two-year experiment with four fertilization treatments:A(N 285 kg·hm^-2+P₂O₅ 285 kg·hm^-2),B(N 240 kg·hm^-2+P₂O₅ 240 kg·hm^-2),C(N 195 kg·hm^-2+P₂O₅ 195 kg·hm^-2) and D(N 150 kg·hm^-2+P₂O₅ 150 kg·hm^-2,the local conventional fertilization as a control).The results showed that,compared with the control,the yield of treatment C increased while that of other treatments decreased,and the yield decreased with the increase of fertilization amount; the quality of three treatments was inferior to the control,and protein content of grain rose while 1000-seed weight and plumpness (abdominal diameter ≥ 2.5 mm) reduced with the increase of fertilization amount; the nitrogen agronomy efficiency and the nitrogen partial productivity decreased with the increase of fertilization amount.Increasing fertilization was negative to the yield formation and reduced the utilization rate.Therefore,optimizing fertilization and zero fertilization increase would be the main ways to achieve high quality and high yield of Ganpi No.7.