钾肥用量对滴灌谷子生长发育及产量的影响OA北大核心CSTPCD

[Objective]In order to clarify the appropriate amount of potassium fertilizer and its influence on the growth and development of millet in North Xinjiang,and to provide theoretical basis for high-yield cul-tivation of spring sowing millet in North Xinjiang.[Methods]Five kinds of potassium fertilizer(0,75,150,225,300 kg/hm2)were used in field tests with Yugu 18 as test material.Dry matter accumulation,chlorophyll content,internode fullness,agronomic characters and yield of millet were determined.[Results]With the in-crease of potassium application,agronomic indexes showed unimodal curve change,and the highest value was found in K225 treatment.Compared with K0 treatment,plant height,ear length,ear diameter,stem base diam-eter,leaf length and leaf width were significantly increased by 8.1%,26.1%,20.9%,22.6%,12.9%and 9.4%.Compared with the control(0 kg/hm2),Yugu18 was significantly increased by1.2%-6.4%under potassium application,and the highest yield was 7,891.1 kg/hm2 under 225 kg/hm2 potassium application.(2)Compared with the control(0 kg/hm2),chlorophyll content increased significantly in each period after anther,showing a trend of first increasing and then decreasing,and reached the peak value under K225 treat-ment.The dry matter accumulation showed a"J"shaped curve with the extension of growth period,and the dry matter accumulation rate showed a single-peak curve,and the maximum accumulation rate reached its peak from heading stage to full head stage.Moreover,the basal internode fullness increased obviously with the increase of potassium fertilizer.[Conclusion]the application of appropriate potash fertilizer has a significant effect on the growth and development of millet in northern Xinjiang,and K225 treatment is the best application amount of potash fertilizer in Xinjiang.