CAJ | 학술논문

采用网袋法,研究不同还田方式下木薯茎秆腐解及养分释放特征。结果表明：不同还田方式下,木薯茎秆在30~60 d腐解速度较快,在240 d时,覆土、覆土覆膜和仅覆膜处理下木薯茎秆的质量累积减少率分别为69．9%、80．8%和73．8%,表现为覆土覆膜>覆膜>覆土。腐解过程中木薯茎秆养分的释放速率表现为K>P>N≈C。240 d,碳、氮、磷、钾的累积释放率分别为69．9%~80．8%、78．1%~94．2%、87．3%~93．5%、97．4%~98．5%。考虑木薯茎秆还田养分的释放及碳氮比变化情况,木薯茎秆还田时可以适量减少基肥中钾肥的用量,并在还田后期结合木薯的生长情况适当配施氮肥；木薯茎秆还田最好采用覆土覆膜的方式。
채용망대법,연구불동환전방식하목서경간부해급양분석방특정。결과표명：불동환전방식하,목서경간재30~60 d부해속도교쾌,재240 d시,복토、복토복막화부복막처리하목서경간적질량루적감소솔분별위69．9%、80．8%화73．8%,표현위복토복막>복막>복토。부해과정중목서경간양분적석방속솔표현위K>P>N≈C。240 d,탄、담、린、갑적루적석방솔분별위69．9%~80．8%、78．1%~94．2%、87．3%~93．5%、97．4%~98．5%。고필목서경간환전양분적석방급탄담비변화정황,목서경간환전시가이괄량감소기비중갑비적용량,병재환전후기결합목서적생장정황괄당배시담비；목서경간환전최호채용복토복막적방식。
Net bags were employed to research characteristics of decomposing and nutrients releasing of cassava stalk under dif-ferent ways returned to field. The results showed that the decomposing speed of cassava stalk was fast during 30 to 60 days un-der different ways returned to field. Under covered with soil, covered with soil and plastic film and covered with plastic film only, the accumulated decay rate was 69. 9%, 80. 8% and 73. 8% respectively at the 240th day, and was ranked as: cov-ered with soil and plastic film >covered with plastic film only>covered with soil. Releasing speed of nutrients of cassava stalk ranked as: potassium > phosphorus >nitrogen≈carbon. The accumulated releasing rates of carbon, nitrogen, phosphorus and potassium were 69. 9% ~80. 8%, 78. 1% ~94. 2%, 87. 3% ~93. 5% and 97. 4% ~98. 5% respectively at 240th day. Considering both the nutrients releasing and carbon nitrogen ratio, it was suggested that the content of potassic fertilizer in base manure should be reduced and nitrogen fertilizer could be increased according to growth of cassava. The way of covered with soil and plastic film when returned cassava stalk to field could be the best choice.