Mechanism Of Facilitation Phosphorus Uptake In Chickpea/maize And Rape/maize Intercropping

Intercropping is a traditional agricultural cropping patterns in china. Intercropping plays an important role in the agriculture of world, most researches are focus on legumes and grass intercropping. Legume/grass intercropping is regarded as an increased more production and sustainable cropping patterns,its resource utilization (water, light, nutrients), its legume nitrogen fixation improved intercropping system nitrogen utilization and reduction of negative impacts on the environmental. legume/ grass intercropping system can increase the oproduction because of legume nitrogen fixation on N-deficient soils, but in the world, there is a large number phosphorus-deficient soils. In the pot experiment, legume/grass intercropping has been proved inercropping uptaked more phosphorus than momoculture on P-deficient soil. In this study, P-efficient crop(faba bean,chickpea,soybean,rape) intercropped with maize under different rate of P applicated(0,40,80kg/ha), further to proved of this phenomenon under fields experiment.Soils of acid phosphatase and pH in rhizosphere may explain intercropping uptake more phosphorus. Experimental results are as follows:Chickpea secreted acid phosphatase and decreased soil pH to improve the soil absorption capacity of insoluble phosphate without P, Phosphorus uptake of chickpea was not different between with no P and with P.In chickpea/maize intercropping P uptake of intercropped maize was no among difference phosphorus situation and maize intercropped with chickpea absorpted more phosphorus, biomass of chickpea was no significant differences. Chickpea significantly affected by cropping system, soil acid phosphatase activity of intercropped chickpea was lower than monoculture, soil pH of intercropped chickpea was higher than in monoculture, P uptake and yield of intercropped chickpea werelower than monoculutre.Rhizosphere process of chickpea in acid phosphatase activity and changes in soil pH played an important role on P uptake and yield of crops. P uptake in chickpea/maize intercropping was higher than Weighted mean for sole crop.Rape increased capacity of using organic phosphorus and decreased soil pH when with no P,can not meet the growth and development of maize and rape.P uptake of intercropped rape did not change among difference phosphorus situation, but P uptake of intercropped maize was lower than monoculture. total P uptake of intercropping system was less than Weighted mean for sole crop.Acid phosphatase and pH changes of rape in rhizosphere can not explain that the phosphorus uptake of intercropped maize than monoculture increased.