Abstract:

The research aimed to study effects of phosphorus supply on direct-seeding rapeseed yield, phosphorus recovery efficiency and economic benefits. The results indicated that: P fertilizer could increase rapeseed yield significantly. Rapeseed yield was improved with the amount of P fertilizer added. When the rates of P fertilizer were between 90-180 kg/hm2, rapeseed could achieve higher yield. With the increase of P application rate, partial factor productivity was decreased. But there’s no obvious rule about the P agronomic use efficiency. The results also showed that P fertilizer significantly increased the economic benefits of direct-seeding rapeseed. The treatment of P180 achieved the maximum income and net profit of 7028.21 yuan/hm2 and 6540.21 yuan/hm2, respectively. The treatment of P45 and P90 achieved better the value to cost ratio (VCR) of 11.84 and 11.53, respectively. Taking effects of rapeseed yield, phosphorus use efficiency and profit into consideration, the optimum phosphorus rate was 90 kg/hm2 along the Yangtze River Regions in Anhui under the condition of this experiment.