关键词: 豫南稻区, 再生稻, 精确定量栽培技术, 氮肥用量

Abstract:

In order to explore the optimum nitrogen applying level of precise and quantitative fertilizer application of ratoon rice in south Henan province, a field experiment was conducted to compare and analyze the growth of rice, occurrence of disease and insect pests, lodging and yield of rice under different nitrogen fertilization conditions, with Liangyou 6326 as material, and obtain the optimum nitrogen content by fitting the economic benefit curve. The results showed that, the yield of two seasons was the highest when the nitrogen fertilizer amount of main rice and ratoon rice was 14 kg/667 m2 and 8 kg/667 m2, respectively. Under this condition, the main rice has appropriate group, photosynthetic rate is normal in later stage of growth, occurrence of lodging and sheath blight are less, has more dry matter accumulation of stem-sheath in mature period, and is good for the germination of high level regeneration bud. Through the economic benefit curve fitting, the result showed that, the suitable N application amount of Liangyou 6326 as ratoon rice is 27.54 kg/667 m2, and the yield could reach 847.11 kg/667 m2.

Key words: the south Henan province, ratoon rice, precise and quantitative cultivation techniques, nitrogen fertilizer