【作者】 李永丰； 娄群峰； 吴竞仑； 周恒昌； 刘丽萍；

【Author】 LI Yong-feng;LOU Qun-feng;WU Jing-lun;ZHOU Hen-chang;LIU Li-ping;Institutute of Plant Protection,Jiangsu Academy of Agricultural Sciences;Institute of Agricultural Modernization,Jiangsu Academy of Agricultural Sciences;Agricultural Production Means Incorporation in yizhen city;

【机构】 江苏省农业科学院植物保护研究所； 江苏省农业科学院农业现代化研究所； 江苏省仪征市农业生产资料公司；

【摘要】 通过多年多点试验,建立抛栽水稻大田立苗后有草天数或无草天数与水稻产量损失率之间的函数关系,以探明抛栽水稻田间杂草的生态防治阈期。结果表明:抛栽水稻田间杂草的生态防治阈期,汕优63为抛后14~23 d;武运粳8号为抛后12~31 d,此时水稻处于6叶期至8叶期,此阈期的始期和终期为田间杂草密度及生物量的快速增长期。在此阈期内保持田间无草,既能使杂草造成的水稻减产率低于3%,又能充分发挥杂草在田间生态系统中所起的积极作用。更多还原

【Abstract】 Field experiments were conducted in paddy to study the functional relationships between the weedy or weed-free days and the yield loss rate of rice transplanted by throwing,and determine the threshold period of weed control in rice field.The results indicated that the critical period for weed control in rice transplanted by throwing was about 14 to 23 days for Shanyou 63 or about 12 d to 31 days for Wuyunging 8after throwing,which was about 6 to 8 leafage of rice.Marked increase of density and biomass occurred at both ends of the critical period.Weed-free during the critical period could not only assure rice yield loss less than 3%level,but also maximally utilize the beneficial role of the weed in field ecology system.更多还原