Effects of Long-term Straw Returning and Nitrogen Fertilizer Regulation on Soil Quality and Yields of Rice Field

doi:10.7668/hbnxb.201750955

Abstract

Abstract: In order to reveal the response of soil to long-term straw returning and nitrogen fertilizer regulation, based on field experiments of rice-wheat rotation, effects of straw returning and nitrogen fertilizer (with TB as no straw return with 300 kg/ha nitrogen fertilizers, and T0, T17, T20 and T23 as straw return with 0, 255, 300, 345 kg/ha nitrogen fertilizers) on physico-chemical properties, concentration of heavy metals, organic matter content and carbon pool management index, rice yields were investigated. The results showed with the increased of nitrogen fertilizer,total N,total P,total K, available N, available P, available K, organic matter, labile organic matter, microbial biomass carbon and yields of T17, T20 and T23 were increased, but no significant difference of the total organic matter, total N, total P and total K. Bulk density decreased, and there were no apparent accumulation of Hg, As, Pb, Cd, Cr, Cu, Zn in the soil.With the same amount of fertilizer, straw return to soil (T20) significantly increased available N and available P, which were higher than those of TB by 21.1%, 8.9% respectively. Considering the factors of soil quality, rice yield and economic cost, non-polluting straw return with 300 kg/ha nitrogen fertilizers (T20) could not only avoid competing for nitrogen fertilizer with crops in the process of straw decomposition, but also promoted the renewal of soil carbon and nitrogen, improved yield and soil quality.

Key words: Straw returning, Nitrogen fertilizer, Physico-chemical properties, Heavy metals, Organic matter, Carbon pool management index, Yields

CLC Number:

S143.1

ZHANG Juanqin, ZHENG Xianqing, ZHANG Hanlin, LÜ Weiguang, LI Shuangxi. Effects of Long-term Straw Returning and Nitrogen Fertilizer Regulation on Soil Quality and Yields of Rice Field[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(1): 181-187. doi: 10.7668/hbnxb.201750955.

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