优质稻南粳9108机插高产栽培区域生态适应性分析

摘要

The effect of mechanized cultivation on yield,growth duration and utilization of temperature and illumination of japonica high quality rice of Nanjing 9 108 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 9 108 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.%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。