Abstract:

To clarify the optimal application ratio of base, tiller and panicle fertilizer, this study investigated the effects of different nitrogen fertilizer management strategies on the yield, nitrogen use efficiency and grain quality of high-quality hybrid rice variety Huazheyou 210. In 2022, a field experiment was conducted in Kecheng District, Quzhou City. Huazheyou 210 was used as the test material. Based on a total nitrogen application rate of 180 kg·hm^-2, three fertilizer application schemes were established in terms of base fertilizer∶tiller fertilizer∶panicle fertilizer ratios, with a control group that did not receive any nitrogen fertilizer (CK). The results indicated that nitrogen fertilizer management had a significant impact on rice yield, nitrogen use efficiency and quality. Among the different nitrogen application treatments, N2 and N3 treatments achieved the highest yield and nitrogen use efficiency. In terms of rice quality, the brown rice rate of N2 treatment significantly outperformed other treatments. Chalky grain rate, chalkiness degree, and rice protein content were highest in the N3 treatment, followed by N1 and N2, while the CK treatment had the lowest values. Gel consistency showed the highest value in CK treatment, followed by N1 and N2, and the lowest in the N3 treatment. Considering the yield, nitrogen use efficiency and rice quality, N2 treatment was an optimal nitrogen fertilizer management method for high-quality hybrid rice Huazheyou 210.

Key words: high-quality rice, nitrogen fertilizer management, yield, quality