小麦/蚕豆间作条件下小麦的氮、钾营养对小麦白粉病的影响

Effects of nitrogen and potassium nutrition on the occurence of Blumeria graminis(DC).Speer of wheat in wheat and faba bean intercropping

通过小麦／蚕豆间作盆栽试验，研究比较了单作和间作条件下不同氮、钾营养水平对小麦氮、钾养分吸收和小麦白粉病发生的影响。结果表明：小麦蚕豆间作提高小麦子粒产量74．7％～133．9％，低氮条件下，间作提高小麦氮吸收量14．7％～169％；在高氮条件下，间作提高氮吸收量的优势降低；间作提高小麦钾吸收量32％～69％，增施钾肥提高小麦钾吸收量25．5％～57．3％。小麦间作蚕豆能明显减轻小麦白粉病的发生，间作平均防效达42．1％～83．1％；小麦白粉病的发生与小麦茎叶的氮吸收量呈显著正相关关系，r=0．623～0．702。

Pot experiment of wheat and fababean in intercropping was conducted in Yunnan agricultural university to study the effect of different level of N and K nutrition levels on the N and K uptake and the incidence of Blumeria graminis （DC）. Speer in intercropping pattern. The results showed that the grain yield of wheat increased by 74.7 %— 133.9% due to the intercropping, The amount of N uptake by wheat increased by 32%—69% and the K uptake increased by 32 %—69 % at low nitrogen supply level in intercropping. The amount of K uptake increased by 25.5 %— 57.3 % after supply potassium fertilizer. The intercropping advantages became smaller at high nitrogen supply level. The occurrence of Blumeria graminis （DC）. Speer of wheat decreased by 42.1%—83.1% in wheat and faba bean intercropping, and the occurrence of Blumeria graminis （DC） correlated with N concentration of wheat＇ s stem and leaf with the coefficient being 0.623 -0.702 .