Effects of Intercropping with different Resistant Wheat Varieties and Faba Beans on Available Nutrient Content in the Rhizosphere

Field experiment was conducted to study effects of the intercropping with three different powdery mildew resistant strains wheat of 93-124(low resistance),YM47(high resistance) and YM42(medium resistance) and faba bean on the available nitrogen(N),phosphorus(P) and potassium(K) contents in the rhizosphere at different growth stages.The results showed that,under monocropping,no significant difference of available nitrogen or potassium content was detected in rhizosphere between different resistant wheat varieties across the whole growth period.And no significant difference of available phosphorus in rhizosphere was observed at the stages of tillering,jointing,heading between different varieties,while the phosphorus content in filling was significantly higher in 93-124 than YM-42.Wheat and faba bean intercropping significantly increased the available nitrogen,phosphorus and potassium content in rhizosphere at the stages of tillering,jointing and heading,and decreased the available nitrogen and phosphorus contents in the rhizosphere at the ripening stage.Between tillering and heading,compared to monocropping,the available nitrogen content in the rhizosphere of 93-124,YM47 and YM42 intercropping systems were increased by 23.16%-46.90%,23.74%-31.78% and 11.23%-22.44%,respectively;the available phosphorus content in 93-124 rhizosphere increased by 35.26%-59.63%;available potassium in YM47 rhizosphere increased by10.87%-57.59%.The intercropping most effectively increased rhizosphere available nitrogen and phosphorus of 93-124,and the available potassium of YM47.And the intercropping with wheat and faba bean had significant advantages of high yield,as the land equivalent ratios of 93-124,YM47 and YM42 were separately 1.01,1.20 and 1.14.