Green Manuring Effect on Changes of Soil Nitrogen Fractions, Maize Growth, and Nutrient Uptake
文献类型： 外文期刊
作者： Yang, Lu 1 ; Bai, Jinshun 2 ; Liu, Jia 3 ; Zeng, Naohua 2 ; Cao, Weidong 2 ;
作者机构： 1.Chinese Acad Agr Sci, Grad Sch, Beijing 100081, Peoples R China
2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr & Rural Affairs, Key Lab Plant Nutr & Fertilizer, Beijing 100081, Peoples R China
3.Jiangxi Acad Agr Sci, Inst Soil & Fertilizer & Resources & Environm, Nanchang 330200, Jiangxi, Peoples R China
关键词： green manure; nitrogen uptake; Orychophragmus violaceus L.; soil nitrogen pools; grain yield; Zea mays L.
期刊名称：AGRONOMY-BASEL （ 影响因子：3.417； 五年影响因子：3.64 ）
ISSN： 2073-4395
年卷期： 2018 年 8 卷 11 期
页码：
收录情况： SCI
摘要： Green manure is a promising, at least partial, substitution for chemical fertilizer in agriculture, especially for nitrogen (N), which in soil can be radically changed by exogenous input. However, it is not well understood how, after green manure incorporation, soil N changes coordinate with crop N uptake and consequently contribute to fertilizer reduction in a maize-green manure rotation. A four-year field study was performed consisting of (1) control, no fertilization; (2) F-100, recommended inorganic fertilization alone; (3) G, green manure incorporation alone; (4) F-70 + G (70% of F-100 plus G); (5) F-85 + G; and (6) F-100 + G. The results show that treatments with 15-30% reduction of inorganic fertilizer (i.e., F-70 + G and F-85 + G) had similar grain yield, dry matter (DM) accumulation, and N uptake as F-100 treatment. F-100 + G maize had 17% greater DM and 15% more N uptake at maturity relative to F-100. Of the five soil N fractions examined, dissolved organic N (DON) and mineral N (N-min) explained over 70% of the variation of maize DM and N accumulation. Partial least squares path modeling further revealed that soil N fractions had positive indirect effects on DM production through N uptake, which might be coordinated with improved DON and N-min status at both early and mid-late stages of maize growth. Overall, the results highlight enhanced maize production with reduced fertilizer inputs based on green manure incorporation in temperate regions.
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