Abstract:

To obtain the optimal fertilization amount for rice in central Sichuan Basin, the ‘3414’ fertilizer effect field experiment was conducted to establish a high-yield fertilizer model and provide a precise fertilization scheme for rice production in Zizhong County. Three factors of nitrogen, phosphorus and potassium fertilizers were set up, with four levels for each factor. There were a total of 14 treatments, and each treatment was repeated three times. The results showed that the correlation coefficient (R²) of the established ternary quadratic fertilizer effect regression equation was 0.976. The maximum yield of rice was 7923.56 kg/hm² with 215.28 kg/hm² of pure nitrogen application, 101.40 kg/hm² of phosphorus pentoxide and 104.14 kg/hm² of potassium oxide application. The optimal application of pure nitrogen was 196.83 kg/hm², phosphorus pentoxide 74.81 kg/hm², potassium oxide 102.90 kg/hm², and the optimal yield of rice was 7867.96 kg/hm². The established fertilizer effect model can be extended to similar rice producing areas in the central Sichuan Basin for predicting fertilizer application in rice production.

Key words: rice, ‘3414’ test, fertilizer, yield, Sichuan Basin, basin fertilizer effect, field experiment, fertilization model, rice production