Accumulation of soil inorganic nitrogen in mono-harvesting farmlands of northeast China in late autumn

Abstract

Abstract: The study showed that in northeast China,the farmlands with a mono-harvesting agricultural system had a low accumulation of soil inorganic nitrogen after harvest.In late autumn,there was an interval of about 20～30 days when the temperature and humidity were appropriate to soil N mineralization,but the mineralized nitrogen could not be used by crops in this non-growing season.The accumulation of inorganic nitrogen in upland soil reached a high level before freezing.Its inorganic nitrogen content in 1m depth soil was 99.9 kg·hm^-2 in the treatment of commercial fertilizers(N 150 kg·hm^-2;P 16.4 kg·hm^-2;K 62.3 kg·hm^-2)and 145.4 kg·hm^-2 in the treatment of commercial fertilizers plus manure(pig manure by a reutilization of 80% product).While in rice field,its inorganic nitrogen content was relatively low before freezing.The reason might be that the soil permeability was not as good as that in upland for its long-term water-logging,and its insufficient aeration would be favorable to denitrification which induces the inorganic nitrogen loss via N₂O emission.

Key words: Accumulation of inorganic nitrogen, Mono-harvesting farmland, Non-growing season

CLC Number:

S153.6⁺1

CHEN Xin, ZHANG Qingzhong, LU Caiyan, SHI Yi, ZHANG Lu. Accumulation of soil inorganic nitrogen in mono-harvesting farmlands of northeast China in late autumn[J]. Chinese Journal of Applied Ecology, 2004, (10): 1887-1890.

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