再生稻促芽肥高效施用量与头季稻齐穗期库源结构关系

Relationship between the efficient amount of nitrogen application for bud development and the source-sink structure at full heading stage of main crop

以杂交中稻组合II优602为材料,通过头季稻不同施氮量塑造施促芽肥当时植株营养状况的差异,在此基础上分别设再生稻促芽肥施用量处理,探明了再生稻促芽肥高效施用量与头季稻齐穗期库源结构关系。结果表明,再生稻促芽肥高效施用量分别与头季稻齐穗期剑叶的SPAD值、单位颖花绿叶占有量呈显著负相关关系,预测出了在头季稻齐穗期剑叶不同的SPAD值、单位颖花绿叶占有量下,再生稻促芽肥的高效施用量;当头季稻齐穗期剑叶的SPAD值高于47.39,单位颖花绿叶鲜重占有量高于27.53mg.粒-1,单位颖花绿叶干重占有量高于1.05 mg.粒-1时,均可分别作为不施促芽肥的苗情诊断指标。

Relationship between the efficient amount of nitrogen application for bud development and the source-sink structure at full heading stage of main crop in different amount of nitrogen application of main crop and ratooning rice was investigated using ‘ ll-you 602＇, a mid-season hybrid rice combination. There were significant negative correlations between the efficient amount of nitrogen application for bud development and SPAD values of the first leaf from top and the source-sink ratio at full heading stage of main crop , the efficient amount of nitrogen application for bud development under different SPAD values of the first leaf from top and different the source-sink ratio at full heading stage of main crop were predicted.The diagnosing index of need not to apply nitrogen for bud development in ratooning rice production practice was that the SPAD values of the first leaf from top were over 47.39 or the wet weight of leaf-graln ratio were over 27.53 mg. grain ^-1 or the dry weight of leaf-grain ratio were over 1.05 mg.grainat full heading stage of main crop.