Impact Of Different Potassium Levels On Potato Growth Development,Production,Quality And Soil Nutrient

1.Germination rate of the potatoes in good condition, more than80%.The highest germination rate is K3treatment under different level of potassium level,97%; Throughout the potatoes growing period, plant height for the increases first and then decreases, and K3treatment always significantly higher than that of the KO and other treatments;the number branches of the potatoes increases first and then decreases in the whole growth period; the beginning of tuber formation period, K3treatment the number of leaves is always higher than other treatments; with the increased levels of potassium, potatoes per plant tuber number increased first and then decreased.2.Potato growth and development process, the whole plant dry matter weight accumulation of the overall trend with the reproductive process of growth, dry matter accumulation in the tuber expansion of roots, stems, leaves and tubers were shown increasing and decline trend,tubers shown rapidly increasing trend.Root dry matter accumulation in the whole growth period expressed as:rapid growth, slow growth and continued to decline; potato stem dry matter accumulation as similar as roots; dry matter accumulation in the leaves faster. Starch accumulation period dry matter reached the maximum, and then with the decline of the leaves, shedding, dry matter accumulation began to decline; the impact of the tuber dry matter weight of the tuber formation period,tuber growth period and maturity period differences are significant, and in the starch accumulation period,the difference was not significant. K3treatment dry matter reached the maximum in the maturity period.3. The potato production to increase under different level of potassium level, K3treatment with the highest yield, namely, potassium105kg·hm-2to achieve the highest yield, followed by sorting each treatment according to the production as follows:K3> K2> K1> K0> K4, potassium can increase potato production, potato production increase with the increase in the amount of potash, to a certain amount, and decreasing with the increase in the amount of potash; K3treatment with a lower proportion of small tubers, is12.57%, but KO and K4treatments reached14.67%and17.99%. Show that:High yield,the lower proportion of small tubers,low yield,the proportion of small tubers is higer.4.The protein content of potato tubers there was no difference among the treatments in different potassium levels, but the higher the protein content of potato as a whole; K3treatment starch content compared with KO treatment high9.95%. The amount of Additional Potassium can improve potato starch content, but with the increase in the amount of potash, starch content decreased; Vc content is generally80to110mg/kg, the total content is very high. Its content depends mainly related to the degree of maturity of the varieties and tuber, the general rule is the maturity of the tubers high, Vc content is also higher; Each treatment the tuber reducing sugar content of less than0.4%, ideal. Tuber reducing sugar content and starch content, reducing sugar content and starch content consistent with the change.5. N content in the leaves of potatoes were higher than in roots, stems and tubers in the whole growing period. With the advance of the growth period, the N content in roots, stems, leaves, tubers general downward trend. Whole plant N content dropped from the59.86g/kg in seedling stage to the28.24g/kg in maturity stage, decreased by52.82%. Early growth stage, Potato of roots, leaves N degrees higher, indicating that potato early growth stage need N large; P content of various organs in the potato growth period the difference is not great, stem P content in the seedling stage and the highest,overall was a downward trend; tubers P's little change in the whole growth period; the P content in the leaves is lower than the stem except at the seedling stage, the starch accumulation period of less than tubers, the rest is generally higher than in roots, stems and tubers; K content in various organs of the potato growing period are generally expressed as stems> leaves> tubers> root, applied potassium fertilization with the same nitrogen and phosphorus levels were higher than the non-applied potassium fertilization treatment, of which potassium105kg·hm-2(K3treatment)the fertilizer maximum.6.The whole plant of potato, from seedling to maturity, the N accumulation in plants growing, the maturity highest; P accumulation in the whole growth period a bimodal curve, this may be due to P in the plant easy flow; whole plant potato K prime accumulation showed a single peak curve, and overall showed a trend of increase slowly at first,rapid increased and then decreased.7. With the increase in soil depth, soil Avail N content shown decreased. K3treatment0～5cm soil Avail N, for example, compared with the KO treatment increase is2.66%; the whole soil depth, soil avail P content decreased faster; In N andP fertilizer on the basis of long-term continuous potassium can significantly improve the content of the soil avail K, and a greater impact on soil avail K content, as a whole, with depth changes, soil avail K decreased slightly.