洞庭湖三熟制双季稻区，由于温光资源不足季节矛盾突出，早稻因油菜收获迟而只能在5月中、下旬正常插秧，晚稻则因寒露风的威胁和抢栽油菜的需要，只能适时早播，培育超长秧龄壮秧而限定在10月中旬正常成熟，因而早、晚两季水稻本田营养生长期几乎为0。虽在这一耕作栽培模式下 Dongting Lake three-season double cropping rice, due to lack of seasonal highlights the lack of temperature and light resources, early harvest because of rape late but only in mid-May, late normal transplanting, late rice due to the threat of cold dew and grab the need for planting rapeseed, Can only be timely and early sowing, nurturing super long seedling seedling and limited to normal ripe in mid-October, so early and late season rice Honda vegetative growth period is almost zero. Although in this farming mode