摘要
盆栽试验表明,适当减少生产前期的氮或氮钾肥施用量对两系稻N31S/P40有效穗数和每穗粒数影响很小,但将总肥量1/3左右的氮或氮钾在始穗期施用,明显促进籽粒在灌浆初期的淀粉积累,改善籽粒的结实性、结实率、谷产量和收获指数明显提高。增加始穗期氮钾施用比例比单纯增加施氮比例效果更好。
In this experiment,nitrogen or nitmgen and ptassium accounting for one third total fer-tilization amount was topdressed to the pot grown two-line ybrdrid rice N31/P40 at the ini-tial heading stage.Compared with the control,to which the fertilizers were all applied beforetransplanting,the number of effective panicles and total spikelets per panicle were not influ-enced by reducing one third nitrogen or nitrogen and potassium at the early growth stage.However,top-dressing at initial heading stage could play a very important role in stimulatingstarch accumulation of kemels at the early stage of filling,improving the spikelet fertility,particularly improving the spikelet fertility of the kernels on mid-and low-branches of thepanicle.There were significant effects on increasing the filled grain rate,grain yield and har-vest index.But,the effect of top-dressing nitrogen and potassium at initial heading stagewas better than that of top-dressing nitrogen alone.
出处
《江西农业大学学报》
CAS
CSCD
1996年第2期174-179,共6页
Acta Agriculturae Universitatis Jiangxiensis
基金
广东省自然科学基金
中山大学"211"工程前沿性研究课题
关键词
杂交水稻
氮
钾
结实性
two-line hybrid rice(Oryza sativa L.cv.N31/P40)
nitrogen and potassi-um
spikelet fertility