不同农艺措施对冬小麦次生根影响的动态分析

Dynamic Analysis of Different Agrotechnoloy on Secondary Root Numbers for Winter Wheat

采用四因子五水平二次回归旋转组合设计，研究了播期、播量、施氮量及施磷量对次生根数量的影响。结果表明，返青期以前，播期是决定单株次生根数的主要因素；进入返青期以后，肥料因素的效应开始加强；拨节以后至抽穗期，播量对单株次生根数起决定作用；返青期以前，播期与氮肥交互效应显著，返青以后，播期与播量交互效应显著，至抽穗期播量与磷肥交互效应达极显著水平。因而稻茬小麦在力争早播的同时，适当降低播量，增施氮肥，并配以适量的磷肥，可以使次生根生长处于最佳环境条件，从而获得健壮的根系，为高产奠定基础。

The influence of different agrotechnology on winter wheat secondary root numbers was studied systematically with parabolic regression revolution design for four factors.The results showed that sowing date was the main factor influencing secondary root numbers before green stage,and the fertilizer effect increased after this stage;Sewing norm had the first effect on secondary root numbers of individual plant from elongation to heading stage,The interaction between sowing date and nitrogen fertilizer was significant before green stage,so was the interaction between sowing date and sowing norm after green stage,and that between sowing norm and phosphate fertilizer at heading stage.So when sowing date is earlier,sowing norm should be decreased,with more nitrogen fertilizer and suitable amount of phosphate fertilizer.In this way,secondary root can grow in optimum environment,and become strong,which will lay a good foundation for high yield.