Effect Of Different Potassium Fertilizers And Their Combination On Yield And Quality Of Potato Tuber

In this study, the effects of KCl and K2SO4 on the accumulation and distribution of K and dry matter and the yield and quality of potato were studied under the premise of controlling the same K application amount. Combined with practical production, it is beneficial to increase the yield and quality of tubers, so as to establish the feasibility of KCl in practical production.The following results were obtained through two year plot experiments:Application of KCl to obtain the potato plant height, stem diameter and leaf treatment significantly higher than without applying KCl. In the two years of test, control KCl ratio in the range of 50%- 75% could get the highest plant height, stem diameter and leaf numbers, respectively increased by 13.5%, 12.3% and 3.5%.In the same combination way, KCl ratio have a great impact on leaf area index. This effect was positively within the ration of 50%, the effect was negative related to the ratio of KCl more than 50%.When KCl ratio at 50% KCl have a great impact on leaf area index, it increased 4.7-24%.Under this KCl ratio, the combined application of KCl and K2SO4 was more significant than that of application only one kind of K fertilizer on potato leaf area index. The effect of KCl on potato was smaller than that of specific leaf weight. Among the treatments, Cl S-Cl S-25 got the biggest influence on specific leaf weight, the growth is 7.75%.The establishment of photosynthetic system at early stage and the redistribution of dry matter determine decided the formation of yield. The turning point of the dry matter ac cumulation and distribution of potato appeared in the tuber expanding stage, at this time the ground and the underground dry matter ratio reached 1:1. Accumulation of dry matter of tuber was higher than that in the ground, KCl could be used to make plant of the distribution of more dry matter. The two treatments of which potassium fertilizer of KCl ratio was 50% and 75% was the most significant. Under the same ratio, the effect of combined application of KCl and K2SO4 is better than that the application of single potassium fertilizer.Potassium in potato organs is increasing all the time before starch accumulation. Potassium chloride can promote the accumulation and distribution of potassium in the ground before the formation of tubers. Promoting the transport of potassium from the plant to tubers after tuber formation, at the same time, it promoted the absorption and accumulation of K in the whole plant. This promotion effect is the most significant when KCl ratio in the range of 50%-75%. But 100% ration of KCl application may be higher the critical value of chlorine tolerance of potatoes, thus reducing the absorption of potassium in plants, but it does not reduce the redistribution of potassium to tuber. The combined application of KCl and K2 SO was more conducive to the transfer of potassium in the tubers with the same ration.Application of potassium fertilizer can promote tuber formation, it would increase the number of nodes. The effect of increasing the number of tubers was more than that of single ap plication of K2SO4 when the basal mixed application of potassium fertilizer of KCl ratio at 25%-50%. Application of KCl in base can promote tuber within this range can promote the tuber. Combined application of KCl and K2SO4 had the best effect on the formation of tubers with the ration of potassium fertilizer proportion of KCl in base was 25%. KCl dressing can promote the expansion of tuber so that got the higher mean marketable tuber yield and average marketable potato weight. Potassium fertilizer of KCl ratio in the range of 50%, the ratio was positively correlated with tuber expansion, and it was negatively correlated with more than 50%. In the whole growth period, the ratio of potassium fertilizer of KCl was controlled within 75% would not cause a reduc tion in the production of potatoes.In the same combination way, the starch content of tuber increased first and then decreased with the increase of the ratio of potassium fertilizer of KCl. Tuber starch content was the highest when potassium fertilizer of KCl ratio at 50%. Controlling the ratio of potassium fertilizer of KCl in less than 75% would not reduce the starch content in the tubers. The effect of different methods on the starch content of potato tuber was great, with the same ratio of potassium fe rtilizer of KCl. The combined application of KCl and K2SO4 was more beneficial to the synthesis of starch in tubers.The ratio of potassium chloride and potassium fertilizer was controlled between 25%-50%, and the mixed application of KCl and K2SO4 was more conducive to the formation of yield and quality.