Effect of induced defoliation in pigeonpea, farmyard manure and sulphitation pressmud on soil organic carbon fractions, mineral nitrogen and crop yields in a pigeonpea-wheat cropping system
Effect of induced defoliation in pigeonpea, farmyard manure and sulphitation pressmud on soil organic carbon fractions, mineral nitrogen and crop yields in a pigeonpea-wheat cropping system
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DOI：
10.1016/j.fcr.2013.08.007
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发表时间：
2013-12-01
影响因子：
5.8
通讯作者：
Sharma, Brij M.
中科院分区：
文献类型：
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作者：
Mandal, Nintu;Dwivedi, Brahma S.;Sharma, Brij M.
印度-恒河平原（IGP）地区的土壤中有机质和氮含量本来就很低，因此，研究这些参数的变化，从而养分管理措施是具有重要意义的观点，维持农业生产力。因此，我们研究了肥料NPK单独施用或与不同性质和组成的有机输入组合对木豆（Cajanus cajan L Millsp.）下土壤有机碳（SOC）组分和矿物氮的影响。小麦（Triticum aestivum L.）在印度农业研究所，新德里的一个典型的单粒小麦种植系统上。有机输入包括农家肥（FYM）、亚硫酸压（SPM）和在木豆生理成熟期叶面喷施10%尿素溶液诱导木豆落叶（ID）。与单施化肥相比，有机肥与化肥配施使0-15 cm土层总有机碳（TOC）及其各组分和矿质氮（NH4-N和NO3-N）含量显著增加，但增加幅度因有机质投入的性质而异。与NPK相比，配施FYM或SPM的IPNS使土壤中的Walkley-Black C（WBC）、颗粒态有机碳（POC）和TOC增加幅度更大，而ID处理下微生物量C（MBC）和活性碳（LBC）的增加幅度更大。各处理间WBC、MBC和LBC对TOC的贡献分别为17 - 22%、1.0 - 1.8%和6.7 - 11.8%。将可氧化有机碳分馏成不同的不稳定池有助于检测由于营养管理导致的SOC的更小变化。不同SOC组分之间存在显著的相关性，并与矿质氮和作物产量相关。与单施NPK相比，FYM、SPM或ID与NPK配合沿着处理的木豆和小麦籽粒产量显著（p <0.05）提高。然而，单独使用有机物（FYM或SPM）的产量总是小于使用NPK肥料获得的产量。(C)2013年由Elsevier B.V.出版
Soils of the Indo-Gangetic Plain (IGP) region are inherently low in organic matter and N contents, hence studying changes in these parameters consequent to nutrient management practices is of great significance with the viewpoint of sustaining agricultural productivity. We, therefore, studied the effects of fertilizer NPK applied alone or in combination with organic inputs of varying nature and composition on soil organic carbon (SOC) fractions and mineral-N under the pigeonpea (Cajanus cajan L Millsp.)-wheat (Triticum aestivum L.) cropping system on a Typic Haplustept at the Indian Agricultural Research Institute, New Delhi. The organic inputs included farmyard manure (FYM), sulphitation pressmud (SPM), and induced defoliation (ID) imposed by foliar spray of urea solution (10%, w/v) on pigeonpea at physiological maturity. The total organic carbon (TOC) and its different fractions, and mineral-N (NH4-N and NO3-N) in 0-15 cm soil layer increased significantly with conjoint use of fertilizers and organics compared with fertilizers alone, but the extent of increase differed in accordance with the nature of organic inputs. Compared with fertilizer NPK, IPNS involving FYM or SPM brought greater increase in Walkley-Black C (WBC), particulate organic C (POC) and TOC, whereas the magnitude of increase in microbial biomass C (MBC) and labile C (LBC) over NPK was greater under ID treatments. Contribution of WBC, MBC and LBC towards TOC across the treatments was in the range of 17-22%, 1.0-1.8% and 6.7-11.8%, respectively. Fractionation of oxidizable organic C into different lability pools helped detecting even smaller changes in SOC due to nutrient management. Different SOC fractions were significantly correlated with each other, and also with mineral-N and crop yields. Grain yields of pigeonpea and wheat were significantly (p < 0.05) greater in the treatments that received FYM, SPM or ID along with NPK, compared to sole NPK treatments. Yields with organics (FYM or SPM) alone were, however, invariably smaller than those obtained with fertilizer NPK. (C) 2013 Published by Elsevier B.V.