Abstract:

To optimize the phosphorus (P) fertilizer application practices and improve the yield and economic benefits of rice production, we selected rice ‘9108’ as an experimental variety, and evaluated the rice yield, economic benefit, utilization rate of P fertilizer and soil nutrient contents under different P application rates. The results showed that the highest yield (11781.15 kg/hm ²) was achieved under the P application rate of 37.5 kg/hm². The parameters of the use efficiency, the physiological use efficiency, the agronomic use efficiency and the partial productivity of P fertilizer decreased with the increasing of P fertilizer application rate. The highest P use efficiency was also achieved under the rate of 37.5 kg/hm². Increasing the P application rate could decrease soil pH and the content of soil organic matter and soil alkali hydrolyzable nitrogen, but increase the content of soil available P and soil available potassium. Increasing the P application rate had a positive effect on the economic benefit of rice, but the economic benefit tended to decline when the application rate exceeded 37.5 kg/hm². In short, 37.5 kg/hm² could be recommended as the optimal P application rate for rice production in Xinghua.

Key words: rice, phosphate fertilizer, yield, economic benefits, fertilizer utilization rate, soil nutrients