Regulations of Tartary Buckwheat Photosynthetic Characters and Soil Enzyme Activities by Nitrogen Fertilizer

doi:10.7668/hbnxb.20191665

Abstract

Abstract: To strengthen the nitrogen management of tartary buckwheat,the effects of different types of nitrogen fertilizer on photosynthesis properties,soil enzyme activities and soil nitrogen forms of tartary buckwheat on different stages were investigated. In total four treatments were tested,including conventional urea(U),resin-coated urea(CRU),sulfur-coated urea(SU),organic fertilizer(ORU). The results showed:Compared with conventional urea,controlled release nitrogen fertilizer and organic fertilizer could increase the SPAD value,Pn and decrease Ci effectively;the photosynthesis parameters showed better level under SU treatment on flowering stage,and performed better under CRU and ORU treatment on middle filling stage;Controlled release nitrogen fertilizer and organic fertilizer could promote the soil nitrogen-related enzyme activities on certain degree,especially the effects of organic fertilizer on enzyme activities of late-growth stage was more obvious;Controlled release nitrogen fertilizer and organic fertilizer could increase the nitrate and ammonium nitrogen level significantly,and improve the soil nitrogen supply capacity. The relevant analysis showed,nitrate nitrogen content had positive correlation with soil enzyme activities(urease and protease);ammonium nitrogen content had significant correlation with urease activity on late-growth stage.

Key words: Tartary buckwheat, Nitrogen nutrition, Photosynthetic characters, Soil enzyme activities

CLC Number:

ZHAO Xin. Regulations of Tartary Buckwheat Photosynthetic Characters and Soil Enzyme Activities by Nitrogen Fertilizer[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(S1): 262-267. doi: 10.7668/hbnxb.20191665.

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