Organic Amendments Influence Soil Organic Carbon Pools and Rice–Wheat Productivity

Soil Science Society of America Journal - Tập 72 Số 3 - Trang 775-785 - 2008
Bidisha Majumder1, Biswapati Mandal2, P. Bandyopadhyay2, A. Gangopadhyay1, Pabitra Kumar Mani2, Arnab Kundu2, Debasis Mazumdar3
1Jadavpur Univ. Kolkata West Bengal 700 032 India
2Directorate of Research, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal, 741 235, India
3Dep. of Agril. Statistics Bidhan Chandra Krishi Viswavidyalaya Mohanpur West Bengal 741 252 India

Tóm tắt

Soil organic C (SOC) pools under long‐term management practices provide information on C sequestration pathways, soil quality maintenance, and crop productivity. Farmyard manure (FYM), paddy straw (PS), and green manure (GM) along with inorganic fertilizers were used in a 19‐yr‐old rice (Oryza sativa L.)–wheat (Triticum aestivum L.) cropping system in subtropical India to evaluate their impact on SOC stock, its different pools—total organic C (Ctot); oxidizable organic C (Coc) and its four fractions of very labile (Cfrac1), labile (Cfrac2), less labile (Cfrac3), and nonlabile C (Cfrac4); microbial biomass C (Cmic); and mineralizable C (Cmin). Cropping with only N–P–K fertilization just maintained SOC content, while N–P–K plus organics increased SOC by 24.3% over the control, their relative efficacy being FYM > PS > GM. A minimum of 3.56 Mg C ha−1 yr−1 was required to be added as organic amendments to compensate for SOC loss from cropping. The passive (Cfrac3 + Cfrac4) pool and Cmin constituted about 39 and 11.5%, respectively, of Ctot Organics contributed toward the passive pool in the order FYM > PS > GM. Most of the pools were significantly (P = 0.005) correlated with each other. Yield and sustainable yield index were strongly related with Cfrac1, Coc, Cmic, and Cmin Results suggest Cfrac1 as a useful indicator for assessing soil health, and balanced fertilization with FYM as suitable management for sustaining crop productivity of the rice–wheat system.

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Soil Science Society of America Journal

Tập 72 Số 3

775-785

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