根外施钾对苹果树光合速率的影响研究

Effect of foliage top-dressing of potassium on the photosynthetic rate of apple trees

试验研究金矮生苹果树生育期根外施K对其光合速率的影响结果表明 ,根外施K可促进光合速率 ,一定程度缓和“午休”现象。苹果生育期 5～ 10月份 5次根外施K对促进与延长当年苹果树光合速率和营养积累有显著作用 ,其效应优于根外 1次施K和 3次施K处理 ,每次施K作用持续时间达 2 5d左右。

Photosynthetic rate of apple trees may be improved and the phenomenon of 'noon break' will be eased up to some extents after foliage top-dressing of potassium. It will improve and extend the photosynthetic rate of the apple trees in the same year as well as increase the storage of nutrition after five times of spraying potassium in apple growth period form May to October,and the effects will be kept up for twenty-five days after every spraying of potassium.