瓜类蔬菜的叶片既是光合作用的器官,同时也是养分消耗者。茎叶的密度适宜时,随着叶面积的增加,积累的光合产物也增加。而当叶面积超过一定的限度时,随着叶面积的增加,植株茎叶之间变得郁闭,光合作用反而下降。在郁闭的情况下,生殖生长也受到抑制,病虫害加重,不结瓜或结瓜少。有 Cucumber vegetable leaves both photosynthesis organs, but also nutrients consumers. When the density of stems and leaves is appropriate, with the increase of leaf area, photosynthate accumulation also increases. When the leaf area exceeds a certain limit, with the increase of leaf area, plant stems and leaves become canyon, photosynthesis but decreased. In the case of canopy closure, reproductive growth is also inhibited, pests and diseases aggravate, do not knot or knot less melon. Have