早籼稻塑盘育秧抛栽高产群体发育指标及其调控技术研究

Research on the Early-season Rice Population Development Index and Its Adjustment Technique

试验以早籼稻塑盘育秧抛栽密度、施N量、N素花粒肥比重等3个栽培因子优化设计的15种处理水平组合方案的实施,建立了15种产量差异显著的20套田间小区群体。通过对各小区群体的产量及与产量显著相关的29个群、个体性状(发育指标)统计分析研究,证明了早籼稻盘育抛栽高产群体的发育类型具有多样性,建立了试验因子与产量和29个群、个体性状间的回归模型;模拟出3个产量水平段(<7500、7500￣9000和>9000kg/hm2)的群、个体性状发育指标值和两种产量水平(7500￣9000和>9000kg/hm2)的栽培因子适宜取值范围;初步提出了早籼稻盘育抛栽高产群体发育指标及其建立与调控技术方案。

20 sets of rice populations with the differences of rice yield at 15 levels were set up through the design of three factors： planting density, amount of N-application and the ration of N-fertilizer application in the period of flowering and seed-setting. The statistic analysis of the development indexes of 29 rice populations/individual showed that there was diversity in the development kinds of highyielding population and the model between the experimental factors and yield/other characters of the population/individual was set up. The development index of population/individual at three yield levels （〈 7500, 7500-9000 and 〉9000kg/km^2） and the cultivated measure at two yield levels （7500-9000 and 〉 9000kg/km^2） were simulated and the establishment and adjustment of technical regulation in the development of high-yield rice population were put forward.