不同还田条件下紫云英腐解特征研究

目的]为水稻田合理施用紫云英提供技术指导。方法]用200目尼龙网袋装20 cm长紫云英还田,研究移栽水稻和不移栽水稻空闲田、施肥与不施肥、紫云英不同还田量（每袋装108、216、324 g）对紫云英腐解特征的影响。结果]前期低量紫云英还田腐解最快,腐解率达58.07%～62.08%,高量紫云英还田腐解最慢,腐解率为40.50%～50.31%;移栽水稻与不移栽水稻空闲田紫云英的腐解率差异不明显;施肥可提高紫云英的腐解率。后期不同还田量紫云英的腐解率相近,但低量紫云英还田移栽水稻后腐解率提高1.32%和1.99%,施肥提高紫云英腐解率0.74%和2.05%;高量紫云英还田移栽水稻后腐解率提高2.64%和5.26%。结论]该研究明确了水稻田紫云英的适宜还田方式。

Study on the Streptococcal Debridementdecompose Characteristics of Astragalus sinicus under Different Return-to-field Conditions

Objective] The aim of the study was to provide technical guidance for reasonable application of Astragalus sinicus in paddy field.Method] The A.sinicus with length of 20 cm was filled in 200-pore nylon net bags and returned to field for studying the influence of rice-transplanted and non rice-transplanted spare field,fertilization and non-fertilization,different return-to-field quantities(108,216 and 324 g per bag) of A.sinicus on its streptococcal debridementdecompose characteristics.Result] In early stage,the streptococcal debridementdecompose of low-dosage A.sinicus returned to field was fastest,with streptococcal debridementdecompose rate of 58.07%～62.08% and that of high-dosage A.sinicus returned to field was slowest,with streptococcal debridementdecompose rate of 40.50%～50.31%.The streptococcal debridementdecompose rates of A.sinicus in rice-transplanted and non rice-transplanted spare field had no obvious difference.The streptococcal debridementdecompose rate of A.sinicus could be enhanced by fertilization.In late stage,the streptococcal debridementdecompose rates of A.sinicus with different returned quantities to field were close,and the streptococcal debridementdecompose rate of low-dosage A.sinicus returned to rice-transplanted field was enhanced by 1.32% and 1.99%,that of A.sinicus was enhanced by 0.74% and 2.05% through fertilization and that of high-dosage A.sinicus returned to rice-transplanted field was enhanced by 1.32% and 1.99%.Conclusion] The suitable return mode to paddy field of A.sinicus was confirmed in this study.