Nutrient Uptake And Yield And Quality Of Potato By Phosphorus Application In Ningxia Area

This experiment take field test methods, the fertilizer experiment of potato in the mountainous area of Southern Ningxia Zhongwei Haiyuan area, varieties for the 9th green potato seed, in nitrogen and potassium levels are the same, under different levels of phosphate fertilizer, potato in the whole growth period of dry matter accumulation, in different organs of nutrient content and nutrient accumulation, tuber quality and yield were determined of potato dry matter accumulation, nitrogen, phosphorus and potassium nutrient absorption characteristics. Test results are as follows1.Under the conditions of the test soil, the dry matter of the potato organs is slow growth in the early stage, medium and fast growth, slow growth of the late model, showing the "S" type curve. The dry matter content of each organ of potato was in accord with the Logistic equation. There was a significant difference between each treatment. Leaves, stems, and underground tuber and the optimum processing N:P:K is 15:8:3, respectively, reached 35.52g/plant,20.91 g/plant, 8.00 g/plant,47.07g/plant.2.Uutrient contents of nitrogen, phosphorus and potassium in potato plants varies depending on the organ, leaf nitrogen demand larger, during the whole growth period, seedling period, now bud stage, flowering stage leaf on nitrogen absorption amount is larger, and the absorb nitrogen is conducive to the growth of leaves. When the phosphorus application amount reached 1.739 kg/ 667m2. The growth period of leaf phosphorus nutrient content than other treatments is higher, the higher the amount of phosphorus but will affect the nutrient content of the leaves. The absorption of potassium in leaf reached the highest value at maturity stage. The treatments were increased after the first growth compared to the flat is in the whole growth period. When the amount of phosphorus reached 26.08kg/667m2. In the whole growth period of stems and phosphorus element nutrient content than other treatments more high, less application of phosphate fertilizer will be relatively slow growth of the stems, stems and phosphorus element nutrient content lower. The absorption amount of 0.60%-11.17% in the whole growth period of potassium. The application of slow release nitrogen fertilizer is beneficial to the absorption of nitrogen fertilizer, promote the growth of the underground, and provide nitrogen nutrition for the growth of potato. Phosphorus uptake of phosphorus in the underground was different with different phosphorus content, and there were significant differences. Root absorption of potassium than stems, leaves high absorption capacity. Nitrogen uptake from the soil was absorbed by the soil, which reached the peak of nitrogen uptake during the starch accumulation and maturity stage, and promoted the growth of potato tuber. The amount of phosphorus application affected the growth and size of potato tuber, and the amount of phosphorus was more than that of tuber.3.Potato plant nitrogen, phosphorus, potassium accumulation varies depending on the organ, tubers of phosphorus nutrient accumulation is higher than that of leaves, stems, and underground part of phosphorus nutrient accumulation. The amount of phosphorus was increased, which was beneficial to the accumulation of nutrients in the tubers. Leaf nitrogen accumulation is greater than the stem, root and tuber nitrogen accumulation. Adequate fertilizer application can promote the accumulation of nitrogen in organs, and the growth of seedlings is strong, which is conducive to the transformation and metabolism of various substances in plants. Between the leaves, stems, and underground tubers potassium literacy points accumulated quantity difference, but leaves and tubers of potassium element nutrient accumulated higher amounts.4.This test yield optimal fertilization program:n 32.6 kg/667m2; phosphorus 17.39kg/667m2; potassium 6 kg/667m2, the highest economic benefit. Regression equation of potato yield (YN) and phosphorus application amount (X) by regression statistical analys, When the phosphorus content reached 10 kg/667m2, the potato yield reached the maximum value. With the increase of phosphorus application rate, the yield increased first and then decreased.