肥料运筹对山药膨大及产量的影响

在山药栽培中，施肥直接影响到块茎的膨大及产量的形成。在施足基肥的前提下，块茎生长初期和盛期施肥量分别占总追肥的６０％和４０％，结合生长后期的根外追肥，可确保其地上部有足够的光合面积，为地下块茎的迅速膨大及膨大盛期的延长提供丰富的光合产物，从而夺得高产稳产。

Effects of the Amount of Fertiliser Applied on the Development and Yield of Chinese Yam

Amount of fertilizer applied to chineseyam during its growth period directly affects theformation of the tubers and its yield. In the case ofenough bottom application, the amount of fertilizerat the imitial stage of growth should be 60 % of thetotal, and the amount at the peak of growing stage40 %. At the later stage, the foliage top -dressing ishelpfull to increase the leaf areas for photosynthesis,extend the peak of growing season and accelcrate theformation of tuber rapidly.