Importance of Harvesting Time of Winter Cover Crop Rye as Green Manure on Controlling CH4 Production in Paddy Soil Condition
Winter cover crop cultivation provides high amount of organic matter when applied as green manure in paddy soils but can adversely increase methane (CH4) production during rice cultivation.Main organic components (cellulose,hemicellulose,lignin,) concentrations of cover crops may vary according to the different harvesting dates and might affect differently CH4 production in the paddy soil when applied as green manure.In this study,above-ground biomass of rye (Secale cerealis L.) were harvested over a week-interval for nine weeks (April 23-June 19) and then mixed with dried paddy soil with the rate of 5 Mg ha-1 on dry-weight base for incubation test.The concentration of total C,cellulose and lignin of rye biomass was steadily increased with crop maturing,but total N and labile C concentrations were reversely decreased.Methane production activity has very high positive correlation with labile C (water-soluble C,hot water-extractable C) concentration of rye biomass,but negative correlation with C/N ratio,total C and lignin concentrations.Therefore,CH4 production activity was higher in soils treated with early harvested rye to that of the late rye-harvested treatment.Rye that was harvested on the 2rid-3rd week after the 1 st harvesting date had slightly lower labile C but very high amount of total N,which could be the optimum harvesting period to regulate CH-4 production without compromising its ability to provide added N supply when used as green manure in paddy soil.Conclusively,selection of the optimum period of rye harvesting is considerable to regulate CH-4 production and improve soil fertility during green manure application in paddy soils.
Winter cover crop Cellulose Lignin Hemicellulose Methane Paddy soil
Sang Yoon Kim Hyo Suk Gwon Yong Gwon Park Hyun Young Hwang Pil Joo Kim
Division of Applied Life Science(BK 2 i Program),Gyeongsang National University,Jinju,660-701,Korea Division of Applied Life Science(BK 2 i Program),Gyeongsang National University,Jinju,660-701,Korea;
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
271-273
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）