| The effects of the proportion of organic fertilizer instead of chemical fertilizer on the photosynthetic characteristics and nutritional quality of waxy maize were investigated by field positioning test, which provided a theoretical basis for the scientific application of organic fertilizer in waxy maize production in oasis irrigation area. In this study, ' Jingkenuo 2000 ' was used as the test variety. Under the condition of 300 kg·hm-2 of pure nitrogen application, five treatments were set up, including full application of chemical fertilizer (F1), 25 % replacement of chemical fertilizer by organic fertilizer (F2), 50 % replacement of chemical fertilizer by organic fertilizer (F3), 75 % replacement of chemical fertilizer by organic fertilizer (F4) and full application of organic fertilizer (F5), respectively. The photosynthetic characteristics of waxy maize at tasseling stage, grain nutritional quality at fresh ear stage and fresh ear yield were studied. The results showed that: (1) replacing part of chemical fertilizer with organic fertilizer could significantly improve the photosynthetic characteristics of waxy maize at tasseling stage. Compared with F1, the SPAD value of F2 and F3 treatments increased by 10.6 %~14.3 %, Tr increased by 11.7 %~18.8 %, Pn increased by 11.2 %~17.1 %, Gs increased by 62.2 % ~79.2 %, and Ci decreased by 22.7 %~23.8 %; (2) The fresh ear yield of waxy maize under F2 treatment was significantly higher than that of F1 by 10.4 %; (3) Organic fertilizer replacing chemical fertilizer could significantly increase the soluble sugar content and crude fat content in fresh ears of waxy maize. Compared with F1, the soluble sugar content and crude fat content in F2 and F3 treatments increased by 22.9 %~28.9 % and 8.5 % ~11.4 %, respectively. The crude protein content of F2 treatment was 10.3 % higher than that of F1; In addition, compared with F1, the contents of umami amino acids and sweet amino acids in F2 were significantly increased by 15.7 %~19.3 % and 12.2 %~ 17.4 %, respectively. Among them, the content of aromatic amino acids in F2 was significantly increased by 13.0 % compared with F1. In short, the replacement of 25 % and 50 % chemical fertilizers with organic fertilizers can significantly improve the nutritional quality of waxy corn while increasing the fresh ear yield of waxy corn, and achieve high yield and high quality of waxy corn, which is a reasonable organic and inorganic fertilizer application method in this area. |