秧苗素质对水稻群体结构及冠层温湿度的影响

Effects of Seedling Quality on Rice Population Structure and Temperature-Humidity of Canopy

采用田间小区试验,研究秧苗素质对水稻分蘖、干物质积累、产量及灌浆期水稻冠层温湿度的影响,为水稻高产群体构建及水稻高产管理提供参考。结果表明:水稻产量随秧苗素质的变化呈先增后降趋势,以播种量中等偏下的水稻产量最高;水稻分蘖数、干物质重量皆随秧苗素质的提高呈增加趋势;中等及偏好的秧苗素质(播种量600~900kg/hm^2)有利于水稻高产群体的构建;研究结果还表明,适当增加水稻群体,保持较高的冠层湿度,并提升冠层下层温度,可有效促进水稻有效穗数的增加和水稻增产。

A field plot experiment was conducted to analyze the effects of seedling quality on rice tillering,dry matter accumulation,biomass yield and temperature-humidity of canopy in filling stage,which can provide useful guidance for high yielding rice population construction and management.The results showed that rice yield increased first and then decreased along with the seedling quality change,and the yield of rice with moderate or less sowing rate was the highest.The tiller number and dry weight of rice both demonstrated increasing trends with the rise in seedling quality.Specifically,seedlings of medium-good quality at seeding rates of 600-900 kg/hm2 were benefit to the construction of high-yielding rice population.Moreover,increasing rice population,maintaining high humidity and improving temperature of canopy sublayer can promote the number of effective panicles and grain yield.