水稻精确定量栽培技术对稻瘟病的控制作用

摘要

2009年至2010年在田间自然发病条件下,应用水稻精确定量栽培技术进行小区试验和多点对比试验,以当地常规栽培为对照,比较稻瘟病发病程度.结果表明,采用水稻精确定量栽培技术对叶瘟和穗瘟均有控制作用,在发病前期、中期较明显,并可推迟10d左右发生叶瘟,其中在水肥调控的前提下,扩行处理(26.4 cm×9.9 cm、33 cm×16.5 cm、29.7 cm×13.2cm、19.8 cm×19.8 cm)对穗瘟的控制率在36.04％～53.15％,与其他处理控制率差异显著；而到发病后期,尤其是在稻瘟病偏重发生年份和感病品种中,差异则不明显.生产上应用该技术作为控制稻瘟病的综合措施之一,对减少农药使用量、生产安全稻米、保护环境等具有积极作用.%Control for rice blast with rice precise and quantitative cultivation techniques was examined under natural condition in Kunming during 2009 -2010. The results showed that leaf and panicle blast were controlled to a certain extent. The effect was obvious in early and medium stage of the disease, and leaf blast was postponed about 10 days. Control ratio for panicle blast was 36.04 % -53.15 % by expanding row space (26.4 cm x9.9 cm,33 cm x 16.5 cm,29.7 cm x 13.2 cm,19.8 cm x 19.8 cm) , and was significant difference to others; But the difference was not notable in late stage of the disease, especially in years of rice blast disease outbreak and susceptible varieties. In production , the technique, as one of measures to control rice blast disease, played an active part in reducing the dosage of chemical pesticide, producing safety rice and environmental protection.