注意防止水稻早衰水稻出穗到成熟期，叶片未老先枯黄叫早衰。早衰削弱了功能叶片的光合量，减少灌浆物质来源，是造成秕粒与减产的重要原因之一。１、早衰原因。早熟和中熟品种生育后期气温高，断水过早，叶内氮素下降，生长衰弱，遇高温热风，叶片就提前枯黄衰老，发生早... Pay attention to prevent premature rice paddy heading out to maturity, the leaves are not old yellow first called premature senility. Premature aging weakens the photosynthetic capacity of functional leaves and reduces the source of grouting material, which is one of the important reasons for the production of grain and yield reduction. 1, the cause of premature aging. Early maturity and medium maturing varieties of high temperature late growth stage, early dehydration, leaf nitrogen decreased, weak growth, high temperature hot air, the leaves on the early yellowish aging, occurs early ...