Nitrogen Absorption of Crops Affected by Root Interaction in Maize and Soybean Intercropping

The nutrient absorption and aboveground biomass of intercropping crops are closely related with the root. The objective of the study was to find out some proper combination of maize and soybean based on nutrient absorption and aboveground biomass and to provide a scientific basis for nitrogen absorption of maize and soybean intercropping. In this study, through pot experiment, by root interaction in maize and soybean intercropping with different root separation treatments, including no barrier (NB), mesh barrier (MB) and polythene film barrier (PB), there was studied intercropping maize (seeding stage, jointing stage, large bell stage, booting stage and mature stage), soybean (seeding stage, branching stage, podding stage, filling stage and mature stage) on the absorption of nitrogen in the soil in different growth period. The results showed that in comparison with PB, nitrogen absorption of maize aboveground with NB increased by 36.9% (P0.05) at large flare stage, compared with PB, nitrogen absorption of maize aboveground with MB increased by 22.5%(P0.05) at large flare stage. Compared with PB, nitrogen accumulation aboveground of soybean with MB at seeding stage, branching stage, filling stage, mature stage increased by 14.9%,7.9%,4.5% and 11.6%, respectively(P0.05). Compared with PB, nitrogen accumulation aboveground of soybean with MB at branching stage increased by 29.9% (P0.05). Compared with PB, the economic yield of maize with NB and PB increased by 124% and 93.4% (P0.05), the economic yield of soybean decreased with NB (P0.05). The root interactions improve the economic yields of maize, the economic yields of soybean showed the root interaction of no advantages.