关键词: 双季稻, 控肥, 氮肥, 病虫害, 产量

Abstract: The effects of fertilizer regulation technique （FRT） for diseases and pests control on double cropping rice was tested by field experiments in Wenling city of Zhejiang province, using the rice varieties Zhongzao 39 and Yongyou 538 as materials. Compared with the traditional fertilization habit of the local area, the improvements of FRT include postponing nitrogen application, reducing the application proportion of base tillering fertilizer, increasing the application proportion of panicle and spikelet fertilizer, and optimizing the fertilizer nutrient ratio of nitrogen, phosphorus and potassium as well. The results showed that compared to the conventional fertilizer treatment, the occurrence and damage degree of the main rice diseases and insect pests, including striped stem borer, rice leaf folder, planthoppers and sheath blight as well, were obviously reduced in the rice field taking FRT, and the abundance of natural enemies were increased significantly. Compared to the control of the early season rice and late season rice, the damage degree of rice plant by striped stem borer were decreased by 53.19% and 45.90%, the larva density of striped stem borer were reduced 74.75% and 16.02%, respectively; the leaf folded rates by leaffolder were decreased by 22.28% and 73.17%, the larva density of leaffolder were reduced by 24.82% and 95.28%, respectively; the density of planthoppers were decreased by 43.52% and 88.76%, respectively. Meanwhile, the population ratios of spiders to planthoppers were increased by 52.11% and 25.93%, the density of predatory bugs were increased by 4.14 times and 6.59 times, respectively. The incidence rates of rice sheath blight were decreased by 62.90% in late season rice. The grain number per panicle, the 1 000-grain weight and the ability of lodging resistance of the rice field taking FRT were observably increased. Compared to the control, the yield and the income of the early rice taking FRT were increased by 15.60% and 168.71 yuan/667 m2. Similarly, the yield and the income of late rice taking FRT were increased by 38.73% and 440.53 yuan/667 m2. This experiment proved that the FRT could not only effectively reduce the occurrence and damage of the main rice diseases and pests, but also increase the abundance of natural enemies, as well as increase production and income. It has excellent potential for application on the double cropping rice area.

Key words: double cropping rice, fertilizer manipulation, nitrogen fertilizer, pests, yield