关键词: 水稻, 侧深施肥技术, 减氮

Abstract: In order to explore the nitrogen reduction potential of the side deep fertilization technology in the rice-wheat rotation area in the lower reaches of the Yangtze River, the yield and yield components, nitrogen partial productivity and cost-benefit difference of rice variety Nangeng 5055 applying deep side fertilization technology under different nitrogen reduction gradients were studied. The single-factor design was adopted, and five treatments were set up: customary fertilization （nitrogen fertilizer amount is 20.9 kg/667 m2）, nitrogen reduction by 10%, 20%, 30% and 40%. The results showed that, applying side deep fertilization technology under the condition of reducing nitrogen fertilizer by 10%~20% than customary fertilization could ensure the effective tiller number of rice, increase the rice seed setting rate, and rice yield. The partial productivity of nitrogen fertilizer for rice in the side-depth fertilization and nitrogen reduction treatment was 16.90%~32.41% higher than that of the customary treatment. When nitrogen is reduced by 10%, the rice yield, and planting income could increased by side deep fertilization.

Key words: rice, side deep fertilization technology, nitrogen fertilizer reduction potential