矮壮素对马铃薯磷素营养动态变化和产量的影响

通过对生育前期的马铃薯品种"中薯3号"喷施浓度为0、1.5、2.0和2.5g/L矮壮素(chlorocholine chloride,CCC)后,应用32P示踪技术研究其对磷素营养及其平均每穴产量的影响。结果表明:在各出苗后天数,CCC增加了植株对磷素的吸收,植株中的磷素主要分配到地上茎和叶中,按其相对含磷量依次为地上茎>叶>根>地下茎;植株吸磷量随其生长而增加,但在生育后期总株的吸磷量减少;在各出苗后天数,2.0g/L处理对中薯3号的总株吸磷量增加最大;1.5、2.0、2.5g/LCCC处理使中薯3号平均每穴产量分别增加6.83%、10.10%和3.08%,各处理平均每穴产量与其出苗后36d的叶片含磷量成极显著性正相关。

EFFECTS OF CCC ON DYNAMIC CHANGES IN PHOSPHATE NUTRITION AND YIELD OF POTATO

Effects of chlorocholine chloride(CCC)(0,1.5,2.0 and 2.5g/L)sprayed at early growth period,then the absorption of phosphate nutrition and the average yield per hill of potato cv.Zhongshu 3 were studied with 32P tracer technology.The results were showed that CCC increased the phosphate absorption during the first several days after emergence,and the absorbed phosphate was mainly distributed in stems and leaves,and the relative concentration of phosphate in organs was stem>leaf>root>tuber in turn.The total amount of phosphate absorped by plants increased with the growth of plants,but decreased at the late growth period.The total amount of phosphate absorped by plants was the highest when sprayed 2.0g/L CCC at different days after emergence.The average yield per hill had improved by 6.83%,10.01% and 3.08% after sprayed 1.5,2.0 and 2.5g/L CCC,respectively,and was positively correlated at 1% level with the phosphate content of leaves at 36d after emergence.