本文關(guān)鍵詞：除草劑和土壤改良劑對(duì)熱帶農(nóng)業(yè)生態(tài)系統(tǒng)中微生物生物量動(dòng)態(tài)的影響（英文），由筆耕文化傳播整理發(fā)布。

【摘要】：The influences of herbicide alone and in combination with the soil amendments with contrasting resource qualities on dynamics of soil microbial biomass C(MBC),N(MBN),and P(MBP) were studied through two annual cycles in rice-wheat-summer fallow crop sequence in a tropical dryland agroecosystem.The experiment included application of herbicide(butachlor) alone or in combination with various soil amendments having equivalent amount of N in the forms of chemical fertilizer,wheat straw,Sesbania aculeata,and farm yard manure(FYM).Soil microbial biomass showed distinct temporal variations in both crop cycles,decreased from vegetative to grain-forming stage,and then increased to maximum at crop maturity stage.Soil MBC was the highest in herbicide + Sesbania aculeata treatment followed by herbicide 4- FYM,herbicide + wheat straw,herbicide + chemical fertilizer,and herbicide alone treatments in decreasing order during the rice-growing period.During wheat-growing period and summer fallow,soil MBC attained maximum for herbicide + wheat straw treatment whereas herbicide + FYM,herbicide 4- Sesbania,and herbicide 4 chemical fertilizer treatments showed similar levels.The overall trend of soil MBN was similar to those of soil MBC and MBP except that soil MBN was higher in herbicide 4 chemical fertilizer treatment over the herbicide + wheat straw treatment during rice-growing period.In spite of the addition of equivalent amount of N through exogenous soil amendments in combination with the herbicide,soil microbial biomass responded differentially to the treatments.The resource quality of the amendments had more pronounced impact on the dynamics of soil microbial biomass,which may have implications for long-term sustainability of rainfed agroecosystems in dry tropics.
【作者單位】： Centre
【關(guān)鍵詞】： chemical fertilizer farmyard manure organic amendment Sesbania aculeata wheat straw
【基金】：financially supported by University Grants Commission,New Delhi,India in form of a major research project(No.SR36-32 2008) and University Research Fellowships to Ms.Alka Singh and Mr.Mahesh Kumar Singh
【分類號(hào)】：S182
【正文快照】： INTRODUCTION Tropical dryland agroecosystems generally havelow crop productivity,and the factors responsible arenot only limitations of soil moisture and/or nutrientsbut also the severe weed infestation.Weeds are gene-rally controlled by herbicides(Hyvon

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  本文關(guān)鍵詞：除草劑和土壤改良劑對(duì)熱帶農(nóng)業(yè)生態(tài)系統(tǒng)中微生物生物量動(dòng)態(tài)的影響（英文），由筆耕文化傳播整理發(fā)布。

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