Abstract:

In order to improve and optimize the fertilization applied for potato, the standard test of "3414" with 16 treatments including "level 2+organic fertilizer" treatment as well as the control treatment of conventional and high yield cultivation fertilize doses, were carried out to determine the agronomic characters of potato plants and yields. The results showed that, each experimental plot potato agronomic characters in harvest period potatoes including plant height, fresh weight, stem thick biological base, commodity potato, commodity rate, yield, leaf area index, had significant difference. Theory yield and fertilizer production of different treatment were out of relationship, and the difference of the maximum difference of up to 129.30% or more. The relative yield of the treatment which was nitrogen deficiency was 69.88, the phosphorus deficiency’s was 112.16, the potassium deficiency’s was 95.79, the optimum fertilizer rate for NPK was 1:0.54:1.11 (N=10.22, P=5.54, K=11.36). In addition, the results also showed that, the P application doses did not affect potato yield for the high P content in the soil fertilization of N, P, K, met the ternary quadratic equation as: Y=890.75+159.64N-74.68P+22.56K-4.96N2+6.73P2-0.01K2-2.53NP-2.20NK+2.02PK. The highest fertilization quantity of N was 100.5 kg/hm2, P was 52.2 kg/hm2 and K was 222.75 kg/hm2. So the fertilization technique mode of "less P, recover N, complement of K" for the high-yield potato cultivation provided a scientific theory.