不同土壤水分条件下无机营养对小麦物质生产和水分利用的影响

本文通过讨论不同土壤水分条件下,无机营养对春小麦净光合率、叶片导度、干物质生产、水分消耗等的影响,表明施肥使营养缺乏的春小麦的光合物质生产,水分消耗及水分利用效率(WUE)都明显增大,无机营养对春小麦物质同化和生长的促进要远大于其因增加水分散失而带来的不利影响;在土壤干旱时,施肥春小麦的光合物质生产、水分消耗下降幅度都大于不施肥春小麦,干旱削弱了无机营养在提高春小麦光合物质生产和产量方面的作用。据此,对旱地的合理施肥技术提出了建议。

EFFECTS OF MINERAL NUTRITION ON DRY MATTER PRODUCTION AND WATER USE OF SPRINC WHEAT UNDER DIFFERENT SOIL MOISTURE CONDITIONS

The effects of mineral nutrition on net photosynthesis rate, conduc-tance of leaves, dry matter production and water consumption of springwheat under different soil moisture conditions were studied. Photosynthesis, dry matter production, water consumption and water useefficiency (WUE)of the spring wheat under nutrient deficiency couldbe increased with fertilizer. Mineral nutrition promoted the assimila-tion and growth much more than promoted the increment of water loss.When severe drought occurred. photosynthesis and dry matter produc- tion of manured spring wheat decreased more largely than those ofthe unmanured ones. Drought reduced benefits of mineral nutrition onenhancing photosynthesis, dry matter production and yield. Therefore,suggestions on the rational fertilizing technique Were put forward.