关键词: 垦粳5号, 减氮施肥, 土壤肥力, 品质

Abstract: [Objective] In order to explore the effects of different soil fertility under the condition of reducing fertilizer nitrogen on quality of Kenjing 5. [Method] In present two-factor randomized block design was used to study the effects on reducing fertilizer nitrogen in rice(Kenjing 5) with different soil fertilizer(A1, A2, A3). [Results] Result indicated that reducing nitrogen fertilizer application can effectively improve grain processing quality with the increase of soil fertility. Under 174.0 kg/hm² N of high soil fertility, 195.8 kg/hm² N of middle soil fertility and 217.5 kg/hm² N of low soil fertility condition, brown rice, milled rice rate and head rice rate had good quality; Increasing nitrogen fertilizer application appropriately could reduce chalkiness degree and percentage of chalky rice in low and middle soil fertility. Reducing nitrogen fertilizer application could decrease percentage of chalky rice and chalkiness degree in high soil fertility. Reducing nitrogen fertilizer in different soil fertility may increase amylose slightly and decrease protein content significantly, which could help to increase of the comprehensive evaluation of taste. [Conclusion] For Kenjing 5, there was significant difference in soil fertility and N application among appearance, nutritional quality and comprehensive evaluation of taste and their interations. Decreasing nitrogen application in high soil fertility and increasing nitrogen application low soil fertility was advantageous to improve processing and appearance quality of rice. Decreasing nitrogen fertilizer was beneficial to improve taste value in different soil fertility.

Key words: Kenjing 5, decrease of fertilizer nitrogen, soil fertility, quality