Effect Of Plastic Film-covering And K Application On K Uptake Accumulation And Use Efficiency Of Potato In Drip Irrigation

The studied materials were Favorita and Zihuabai, Five potash fertilizer treatments were setup:Kl,K2,K3,K4,K5;Covering Film and Common cultivation:LKl,LK3,to identify K nutrients absorption,distribution and effects of fertilization on nutrients of different potato varieties in Film Drip Irrigation. The main results were as follows:1. With the groth process, the various organs of the potato potassium content showed a significant downward trend in K fertilizer compared with controls. Potassium fertilizer application improved K content of various organs.It showed "S" curve in whole plant of K accumulation with the growth of potato. Potassium accumulation of early maturity variety Favorita were highest in starch accumulation phase,then growth rate slowed or reduced. Relatively moderate ZiHuaBai showed sustained growth trend from seeding stage to mature period. Potassium uptake accumulation of two varieties are improved with the improvement of the amount of K fertilizer.2. The distribution of K in various organs showed:seeding stage was mainly in leaves and stems.With the groth process, the distribution of K in leaves and stems was reduced, in tubers was improved.K was manily distributed in tubers in mature period. Application of K affected K distribution rate of stems, leaves, tubers significantly.3. Under the experimental condition, production of potato in drip irrigation under film was increased with the improvement of the amount of K fertilizer. The effects of increasing production was obviously under application of K than no application of K. The increased potassium fertilizer had the trend of starch content of tubers, starch content decreased when K excessed. In this experiment, starch content of two varieties was highest when the amount of K are22.5kg K2O/667m2.The difference between the production and the highest yield was not significant, may think that was reference index of reasonable amount of K on potato in drip irrigation under film.4. With the improvement of the amount of potassium, Consumption coefficient, and absorption amount of producing1000kg tubers of copper of Favorita and Zihuabai showed an upward trend, productivity showed downward trend in varying degrees. The potash absorption and utilization, agronomic efficiency, partial productivity, physiological use efficiency of the potato was significantly lower in trend with the increase of the amount of potassium. The more of potassium, the lower the efficiency.5. Plastic mulch increased the accumulation of dry matter of potatoes and improved the tuber production obviously. In the right amount of K conditions, the impact of plastic mulch to potato starch content is not big;in the no amount of K conditions or amount of K is not enough, plastic mulch had the trend of reducion the tuber starch content. Plastic mulch improved the efficiency of potassium fertilizer.6. There were significantly positively correlation between K content,K accumulation and amount of K fertilizer, K accumulation and K content. K absorption utilization, the partial productivity, physiological utilization efficiency and potash agriculture utilization had significant or very significant positive correlation; Partial productivity, physiological utilization efficiency and K absorption efficiency was a significant positive correlation. K content, potassium uptake was a significantly positive correlation with tuber yield, not significant with starch content; the correlation between potash agriculture utilization efficiency and tuber production was not significant, but significant positive with starch content; partial productivity, physiological utilization efficiency and tuber production was not significant correlation, but tubers and starch content is a significant positive correlation.