为研究还田稻草的增产效应及稻草还田后水稻对钾素吸收利用情况,笔者以杂交稻粤杂889和常规稻合丰占为材料,开展了盆栽和大田试验。结果表明,稻草全量还田可以替代50%的化学钾肥,“稻草全量还田+化学钾肥减半”处理比全量施用化学钾肥增产6.55%,达显著水平,增产的主要原因是稻草还田促进了水稻的干物质积累,增加了每穗粒数。
The paper studied the uptake and utilization characteristics of potassium in rice straw returned to field and its effects on grain yield of rice by pot experiment and field experiment with hybid rice Yueza 889 and conventional rice Hefengzhan as experiments material. The results indicated that 50% of chemical fertilizer potassium could be saved when all rice straw was returned to the field. Compared to the treatment with 100% chemical potassium application, the treatment with all straw returned plus 50% chemical potassium application obtained 6.55% higher grain yield in average, which was statistically significant, as a result of increased dry matter accumulation and grains per spike.
[1] 潘瑞炽.植物生理学[M]. 北京:高等教育出版社,2001:30.
[2] 王强盛,甄若宏,丁艳锋,等. 钾对不同类型水稻氮素吸收利用的影响[J]. 作物学报,2009,35(4):704-710.
[3] 陈防,万开元,陈树森,等. 中国南方钾素研究进展与展望[A]. 周建民,Magen H.土壤钾素动态与钾肥管理[C]. 南京:河海大学出版社,2008:99-104.
[4] 张福锁,张卫峰,马文奇,等. 中国化肥产业技术与展望[M]. 北京:化学工业出版社,2007:7.
[5] Alison J E, Jeffrey A B, William R H, et al. Rice yield and nitrogen utilization efficiency under alternative straw management practices[J]. Agron J, 2000, 92(6):1096-1103.
[6] 廖育林,郑圣先,聂军,等. 长期施用化肥和稻草对红壤水稻土肥力和生产力持续性的影响[J]. 中国农业科学,2009,42(10):3541-3550.
[7] 王玄德,石孝均,宋光煜. 长期稻草还田对紫色水稻土肥力和生产力的影响[J]. 植物营养与肥料学报,2005,11(3):302-307.
[8] 蒋邵农,刘传桃,陈琦,等. 稻草还田量对土壤肥力和水稻生产的影响[J]. 湖南农业科学,2001(2):29-30.
[9] 戴志刚,鲁剑巍,李小坤,等. 不同作物还田秸秆的养分释放特征试验[J]. 农业工程学报,2010,26(6):272-276.
[10] 鲍士旦. 土壤农化分析[M]. 北京:中国农业出版社,2000.
[11] 刘开强. 不同耕作方式下稻草分解与养分释放特点及对水稻氮素利用的影响[D]. 南宁:广西大学,2008.
[12] 李逢雨,孙锡发,冯文强,等. 麦秆、油菜秆还田腐解速率及养分释放规律研究[J]. 植物营养与肥料学报,2009,11(2):374-380.
[13] 江永红,宇振荣,永良. 秸秆还田对农田生态系统及作物生长的影响[J]. 土壤通报,2001,32(5):209-213.
[14] 单玉华,蔡祖聪,韩勇,等. 淹水土壤有机酸积累与秸秆碳氮比及氮供应的关系[J].土壤学报,2006,43(6):941-947.