关键词: 机插粳稻, 氮肥, 穴苗数, 产量, 品质

Abstract:

Taking high-quality japonica rice Nangeng 9108 as the material, the effects of nitrogen rate and seedling number per hill on the yield and main quality traits of Nangeng 9108 were studied. The results showed that nitrogen rate, seedling number per hill and their interaction had significant or extremely significant effects on the yield and quality. With the increase of nitrogen rate, the yield increased first and then decreased, when nitrogen rate is 270 kg/hm2, the yield was significantly or extremely significantly higher than that of other treatments; milled rice rate and head milled rice rate showed a decreasing trend, the appearance quality improved, however the eating quality became worse; the peak viscosity, hot paste viscosity, disintegration value and final viscosity of RVA spectrum characteristic values decreased, but setback viscosity and gelatinization temperature increased. With the increase of seedling number per hill, the actual yield of low-nitrogen treatment increased, but the yield of medium and high nitrogen treatments showed a decreasing trend; the processing quality, appearance quality and tasting value all decreased; the characteristic values of RVA spectrum showed an increasing trend. The grain yield of Nanjing 9108 was the highest when nitrogen application rate was 270 kg/hm2 and 3 seedlings per hill, while the combination of 225 kg/hm2 and 5 seedlings per hill could achieve the goal of stable yield and high quality. In this paper, the high yield and good quality cultivation techniques of machine transplanted rice Nangeng 9108 were summarized, in order to provide technical reference for further expanding the planting area.

Key words: mechanical transplanted japonica rice, nitrogen, seedlings number per hill, yield, quality