灌水過(guò)多,過(guò)量灌溉
The role of overirrigation improving photosynthesis decline of flag leaf was mainly at the latter stage and had no role for yield increase. 過(guò)量灌水改善旗葉光合衰退的效果主要表現(xiàn)在后期,對(duì)產(chǎn)量提高的意義并不大。