关键词: 水稻, 山黧豆, 产量, 品质, 土壤肥力

Abstract: In order to explore the effect of reducing the application of N fertilizer in green manure Lathyrus sativus on rice yield,  quality and soil fertility, six treatments were set up including winter fallow + 100% N fertilizer (CK), Lathyrus sativus + 60% N fertilizer (GM+N60), Lathyrus sativus + 70% N fertilizer (GM+N70), Lathyrus sativus + 80% N fertilizer (GM+N80), Lathyrus sativus + no fertilizer (GM) and winter fallow + no fertilization (NF). The results of three years field experiments showed that, compared with CK, Lathyrus sativus combined with reducing N fertilizer application could increase rice yield, GM+N70 and GM+N80 treatments significantly increased rice yields, which increased by 13.84% and 7.25%, respectively. And Lathyrus sativus combined with reducing N fertilizer application could improve brown rice rate, milled rice rate, head rice rate and protein content; reduce chalkiness, chalkiness grain rate and amylose content of rice. The head milled rice rate of GM+N70 treatment was the highest (78.02%), the chalkiness grain rate was the lowest (18.11%). The amylose content of GM+N80 treatment was the lowest (14.26%). The combined application of Lathyrus sativus and N fertilizer could significantly increase the contents of soil organic matter, total nitrogen, alkali hydrolyzable nitrogen and available potassium. In conclusion, Lathyrus sativus and reducing N fertilizer application by 20%~30% should be beneficial to rice yield, quality and improvement of soil fertility, which provided theoretical basis for scientific application of N fertilizer after turning over Lathyrus sativus in Sichuan region.

Key words: rice, Lathyrus sativus, yield, quality, soil fertility