Effect of interspecific interaction on crop growth and nutrition accumulation

A split-plot experiment was designed to study the effect of two nitrogen application levels and interspecific interaction of faba bean, soybean and wheat intercropping with maize on crop growth and nutrition absorb. The results indicate that compared with sole, intercropping with maize have no significant effect on faba bean growth and nutrition absorb. Intercropping with maize promote the growth of soybean before florescence of maize but restrain its growth significant after that time. Intercropping with maize improved the growth and nutrition absorb significantly to wheat. Maize have more yield and nutrition absorb when intercropping with faba bean than sole, but it has been restricted when intercropping with soybean before florescence, and it has more benefit growth and nutrition absorb after that time. Intercropping with wheat, maize has been restricted during co-existed time, and it began to get back after wheat harvest. Land equivalent ratio of biomass at harvest is bigger to 1 when maize intercropping with faba bean but it below to 1 when it intercropped with soybean. Maize intercropping with wheat, the land equivalent ratio is below to 1 when wheat harvest but it increased and arrived at 1 with the growth of maize and more nitrogen applied. Aboveground and belowground interaction between crops determined interspecific reaction together. Effect of biological nitrogen fixation and acidification soil by excrete organic acid and proton from legumes to improve the availability of phosphorus could promote the growth of maize, but stronger ability of nutrition competition of wheat also restricted the growth of maize. Maize which have more bigger height could restrain the growth of soybean after its florescence. Specie has trends of come back to sole in biomass after another stronger competition companion specie harvest. The results indicate that reasonable collocation of species could improve the utilization of resources and got higher yield for intercropping species.