Abstract:
The relations between application of Nfertilizer and Nabsorption in crops,andNaccumulation in soil and Nloss under soilcrops system in wheatcorn double croppingwere studied by location trials of Nfertilizer for five years ar the loam in Wuji county,Hebeiprovince.The results showed that:at the low level of Nfertilizer application,utilizationratio of Nfertilizer was higher,but the grain yield was lower and soilN was plundered cropsat the high level of Nfertilizer application,the grain yield decreased due tonitrogen of excessive absorption in crops,accumulation and leaching loss incrase in Soutilization ratio of Nfertilizer decreased at the rate of Nfertilizer applied which obtainedthe maximum grain yield,the excessive absorption of crops to was not appeared and soil N was plundered by crops.Naccumulation in soil and Nloss were less.Utilized coefficientsof Nfertilizer(including organicN).Thepercentages of Naccumulation in soil and Nloss were less than 5% and 23% respeectively.
Key words:
Wheat-corn double cropping,
Soil-crop system,
Nitrogen balance
CLC Number:
Zhang Wenying, Zhang Qingjiang. Nitrogen Balance of SoilCrops System in WheatCorn Double Cropping[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1994, 9(S1): 109-114. doi: 10.3321/j.issn:1000-7091.1994.z1.023.