Effect of Different Water-Fertilizer Groups on Nitrogen Balance and Leaching in Wheat-Maize Cropping System Surrounding Gangnan Reservoir

doi:10.7668/hbnxb.2014.S1.056

Abstract

Abstract: According to the serious eutrophication status of Gangnan reservoir,reducing the N leaching in maximum when meeting the need of crop growth is the only way for minimizing the non-point pollution in cropland.In this study,balance theory of nitrogen was used to research the effect of water-fertilizer coupling on surplus or loss of nitrogen.The results showed that fertilization and irrigation both effected NO₃-N leaching to deep soil layer,and fertilization was the prominent factor.N in 0-140 cm soil layer of water-fertilizer combination was surplus except CK.Leaching NO₃-N under 140 cm was between 35.23-212.53 kg/(ha · a) with different water and fertilizer.The most environmental friendly combination was N_conW₂,and it reduced the nitrogen leaching 141.19 kg/(ha · a) than N₂W₂,the rate was 80%.The reasonable fertilizer and irrigation can effectively decrease the nitrogen leaching,improve the fertilizer utilization efficiency,and reduce the menace from nitrate to groundwater in Wheat-maize cropping fields surrounding Gangnan reservoir.

Key words: Gangnan reservoir, Wheat-maize, Nitrogen balance, Nitrogen leaching

CLC Number:

S143.1

HAO Gui-qin, WANG Ling, ZHANG Guo-yin, RU Shu-hua, GENG Nuan, SUN Shi-you. Effect of Different Water-Fertilizer Groups on Nitrogen Balance and Leaching in Wheat-Maize Cropping System Surrounding Gangnan Reservoir[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(S1): 299-304. doi: 10.7668/hbnxb.2014.S1.056.

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