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

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*.*。

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

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^**.