摘要
为了研究免耕直播和免耕抛秧两种免耕栽培模式对稻田土壤肥力的影响，开展3年6造连续田间试验，并用数理统计软件-SPSS对稻田土壤肥力进行综合评价。结果表明：与常规插秧比，免耕栽培能使稻田表层（0—5cm）土壤有机质累积。腐殖质品质改善；〉5mm和〉0．25mm水稳性大团聚体含量增加，全氪和速效磷、速效钾养分含量提高，稻田土壤肥力性状有所改善。两种免耕栽培模式中，免耕直播在土壤有机质总量累积速效钾上不如免耕抛秧，但在腐殖质品质、〉5mm和〉0．25mm大粒团聚体含量及速效磷上优于免耕抛秧。稻田土壤肥力综合评价结果表明，土壤表层两种免耕栽培处理明显高于常规插秧，两种免耕模式之间无明显差别；亚表层（5—15cm）3种耕作模式差异也不明显。说明免耕模式更有利于提高稻田表层土壤肥力。
A field experiment was conducted for three years continuously to study the effects of no-tillage direct seeding （NTDS） and no-till- age cast seedling （NTCS） on paddy soil fertility, and evaluated synthetically by mathematical statistic software-SPSS. The results showed that compared with conventional transplanting seedling （CTS） ,NTDS and NTCS could make the soil organic matter cumulate in the top layer（0 -5cm） ,improved the quality of humus,increase the percentage of the aggregates in the size group of 〉 5mm and 〉 0.25 mm, the contents of the total N , available P and available K,improved the properties of the soil fertility. Between the two no-tillage planting modes, the organic matter content and the available K content of NTDS was lower than that of NTCS, however, the humus quality of NTDS was better than that of NTCS,the percentage of aggregates in the size group of 〉5mm and 〉 0.25 mm and the available P content of NTDS were higher than that of NTCS. The Comprehensive Fertility Index（CFI） of the two no-tillage planting modes were higher than that of CTS in the top layer, and there was not significant difference in the CFI of the two no-tillage planting modes ;Three modes had no significant difference in the CFI of the soil sub-arable layer（5 - 15 cm）. It indicated that the no-tillage planting modes were benefit to improve the paddy soil fertility in the top layer.
出处
《西南农业学报》
CSCD
2007年第6期1250-1254,共5页
Southwest China Journal of Agricultural Sciences
基金
广西科学基金应用基础研究专项(桂科基0342027)
关键词
稻田
连作免耕
土壤肥力
综合评价
paddy field
continuous no-tillage
soil fertility
comprehensive evaluation
