Study on the Regularity of K Uptake,Distribution and Accumulation of Oil-sunflowers

In order to improve the utilization of sunflower's cultivation techniques and potash fertilizer,this study chose the oil-sunflower variety named S31,the research studied the effect of the regularity of potassium's absorption, distribution,accumulation and potash fertilizer through the methods combined field experiments,indoor chemical analysis and biological statistics. In result,the potassium uptake of sunflower's stems,leaves showed a similar S curve. In the 70th day of emergence(end of flowering) ,the K content reached to the maximum,and the disc potassium up-take of sunflowers showed a trend of the upward linear; in the 110th day of emergence (mature) ,the K content reached to the maximum between 1. 53-2. 09 g /plant. The day accumulation of potassium of sunflower showed a single peak curve,the peak appears in the end of flowering. The potassium absorption rate changed maximally in OPT treatment,and the maximum was 0. 194 g /(plant·d) ,while it changed minimally in CK treatment,and the maximum was 0. 112 g /(plant·d) . The potassium distributed in leaves(52% ) reached the highest in the seedling state,and it reduced to 9%-16% in the mature stage. The distribution of potassium was up to 61%-66% maximum in the stems in the end of flowering period. The sunflower using potash fertilizer increased the yield by 10% ; and the potassium increased the yield of sunflower 7. 17 kg per kilogram. The utilization rate of potassium fertilizers was 35. 3% ,and 73. 9 kg potassium was absorbed to produce 1 t sunflower.