以常规粳稻南粳9108和南粳5718为试材,探讨了减氮密植对常规粳稻产量形成特征的影响。结果表明,南粳9108和南粳5718在T1处理（较常规栽培减氮10%、增密15%）下的产量与CK（常规高产栽培）条件下基本持平,在T2（较常规栽培减氮20%、增密30%）和T3（较常规栽培减氮30%、增密45%）处理下的产量则较CK显著下降;T1处理下参试品种的有效穗数和每穗粒数与CK相当,T2和T3处理的有效穗数、每穗粒数、群体颖花量与CK相比显著下降,结实率和千粒重亦低于T1处理和CK。本研究表明,适宜减氮密植处理可以实现常规粳稻节氮、高产栽培。

The effects of reducing nitrogen fertilizer and increasing planting density on yield formation characteristics of conventional japonica rice were studied using conventional japonica rice Nangeng 9108 and Nangeng 5718 as test materials. The results showed that the yield of Nangeng 9108 and Nangeng 5718 under T1 treatment （10% reduction in nitrogen and 15% increase in density compared with conventional cultivation） were basically the same as those under CK （conventional high-yield cultivation）, the yield under T2 （20% reduction in nitrogen and 30% increase in density compared with conventional cultivation） and T3 （30% reduction in nitrogen and 45% increase in density compared with conventional cultivation） treatments was significantly lower than that of CK. The number of effective panicles and the number of grains per panicle of the tested varieties under T1 treatment was equivalent to that of CK. The number of effective panicles, grains per panicle, and population spikelets in T2 and T3 treatments were significantly lower than those of CK, and the seed setting rate and thousand-grain weight were also lower than those of T1 treatment and CK. This study indicated appropriate treatment of reducing nitrogen fertilizer and increasing planting density realizes the dual goals of high grain yield and lower nitrogen application rate for conventional japonica rice.