Nitrogen Uptake and Residual Effect of Different Summer Monocropping and Intercropping Patterns in Dry Farming Area in the North China Plain

In order to screen a summer planting pattern which could not only reduce the soil NO-3-N residue content but also provide obvious economic benefits in North China Plain,a field contrast experiment of different single intercropping was conducted in Xushui County,Hebei Province.The results showed that corn soybean intercropping got the highest nitrogen uptake rate,and could reduce the soil NO-3-N residue content evidently,obtain better economic benefits at the same time.Moreover,this treatment got the land equivalent ratio of more than 1,had a good effect in increasing the aftercrop winter wheat grain yields,straw yields and nitrogen uptake.Compared with the traditional monocropping corn,corn soybean intercropping reduced the soil NO-3-N residue content of 0~200 cm by 56.66 kg·hm-2,raised the total nitrogen uptake rate by 6.17 kg·hm-2,and increased got economic benefits by 2 054.62 Yuan·hm-2.Additionglly,the aftercrop wheat grain yields,straw yields and nitrogen uptake rate under this treatment were enhanced by 197 kg·hm-2,673 kg·hm-2,5.91 kg·hm-2,respectively.