Abstract:

The effect of mechanized cultivation on yield,growth duration and utilization of temperature and illumination of japonica high quality rice of Nanjing 9108 was investigated in different ecological regions under the rice-wheat cropping system to lay a theoretical basis for its large area mechanized transplanting and rational distribution. Under mechanized transplanting with blanket-shaped plantlet, we compared the yield,growth duration,utilization of temperature and illumination and green rice rate of Nanjing 9108 at variaus latitudes. The results showed that with increasing latitude the total accumulated temperature and yield first increased and then decreased, while the maturity followed a decrease trend.The whole growth duration increased with rising latitude at a rate of about 5 d for 1°. The total sunshine hours showed the same trend. The illumination has a great impact on the rice grain yield. With appropriate growth duration and high maturity, Central Jiangsu Province and Southern Jiangsu Province at northern latitudes from 32° to 34° are the most favorable planting areas, followed by Northern Jiangsu Province.

Key words: rice, mechanical transplanting, adaptability, latitude, the growth stage

摘要：

研究稻麦两熟制条件下江苏不同生态区机插粳型优质食味水稻南粳9108产量、生育期及温光资源利用差异,为该品种大面积的科学布局和机插推广提供理论依据。以优质超级稻南粳9108为材料,采用毯状小苗机插的方式,比较江苏不同纬度对南粳9108产量、生育期及温光利用和青米率的影响。结果表明,产量和总积温随纬度的升高先增加后减少,成熟度随纬度的升高而降低。全生育期天数随纬度的升高而增加,纬度每升高1°全生育期平均增加3 d左右。日照时数表现出和全生育期一样的趋势。该优质稻的产量受积温影响较大。因此,在机插条件下,按大面积650 kg/667m²产量目标,南粳9108适宜在北纬32°~34°地区种植(苏中和苏南北部地区),生育期适中,成熟度较好,苏北地区次之。

关键词: 水稻, 机插, 适应性, 纬度, 生育期