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利用Hogland全磷和缺磷处理进行了室内砂培桶栽试验 ,研究了玉米 5叶期前的生长状况、生理特性、水分消耗、干物质积累与分配及水分利用效率 .结果表明 ,水磷耦合效应取决于水分的供应方式 ,以干湿交替施磷效果最佳 ,其次为干旱施磷 ,再次为湿润施磷处理 .干湿交替施磷能显著提高光合速率 ,增加作物气孔导度 ,促进根系生长 ,增加根冠比 ,调节整株水平下干物质资源的合理分配 ,提高玉米苗期水分利用效率 .
The experiment of sand culture and pot culture in laboratory with Hogland total phosphorus and phosphorus deficiency was conducted to study the growth status, physiological characteristics, water consumption, accumulation and distribution of dry matter and water use efficiency of maize before five leaf stage.The results showed that water and phosphorus coupling The effect depends on the supply of water, with the best effect of alternating application of wet and dry phosphorus, followed by the application of phosphorus and then the application of wetting and phosphorus fertilization. Alternating wetting and drying can significantly increase photosynthetic rate, increase stomatal conductance and promote root system Growth, increasing root-shoot ratio, regulating the rational distribution of dry matter resources at the whole plant level, and improving the water use efficiency of maize seedlings.