Abstract:

The research aimed to study effects of potassium supply on direct-seeding rapeseed yield, phosphorus recovery efficiency and economic benefits. The results indicated that potassium fertilizer could increase direct-seeding rapeseed yield significantly. Rapeseed yield was enhanced with the amount of K fertilizer added. The treatment K120 achieved the highest yield in the three test plots. With the increase of K application rate, partial factor productivity and K agronomic use efficiency were all decreased. The results also showed that K fertilizer significantly improved the economic benefits of direct-seeding rapeseed. The treatment of K120 achieved the maximum income and net profit of 6556.61 yuan/hm2 and 6052.61 yuan/hm2, respectively. The value to cost ratio (VCR) of K60 and K120 were higher than 2.0. We advise to take the treatment K120 as the optimum along the Yangtze River Regions in Anhui under the condition of this experiment.