Effect of Different Fertilizer Amount and Density on Potato Yield in Alpine-cold Region

Using quadratic general rotation design,selecting nitrogen,phosphorus,potassium,density experimental factors to Qingshu-6 as test material,the effect of different fertilizer amount and density on potato yield were studied.The results showed that impact on potato yield in proper order of DensityPKN.There are positive interactions between phosphate and nitrogen,potassium.It's negative interaction between nitrogen and potassium.The best agronomic measures of Qingshu No.6 in local were nitrogen 329.6-372.7 kg/hm2,phosphorus 229.0-253.4 kg/hm2,potassium 84.2-101.6 kg/hm2,density 64 950-69 375 plants/hm2,under these conditions,can achieve the target yield of 39 000 kg/hm2.