水稻精确定量栽培技术对稻瘟病的控制作用

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10 d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×13.2 cm、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。

Effectiveness of Rice Precise and Quantitative Cultivation Technique against Rice Blast Disease

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×9.9 cm,33 cm×16.5 cm,29.7 cm×13.2 cm,19.8 cm×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.