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对拟高粱在南京分期播种条件下生育进程的变化及其与温度和日长的关系进行了初步的研究。拟高粱播种至成熟全生育期为176～141天,随播期延迟而缩短。播期对播种至分蘖的天数影响较大。播种至出苗的天数与最低温度呈极显著负相关(r=-0.9577),与5厘米地温呈二次曲线关系,地温为29.9℃时出苗最快。出苗至分蘖的天数则与平均气温(X)呈二次曲线关系((?)=252.08-18.22X+0.36X~2,F=33.3~(**)),平均气温为25.3℃时出苗至分蘖的天数最短。抽穗至成熟的天数与平均气温呈极显著负相关(r=-0.9475)。表明拟高粱播种至分蘖、抽穗至成熟均表现温度效应。短日处理拟高粱分蘖至抽穗的天数较对照缩短38～54天,可见拟高粱分蘖至抽穗主要表现日长效应,并随着温度的升高短日效应增强。拟高粱在南京不宜作收种用,收草则以4月下旬播种为宜。
A preliminary study on the changes of fertility progress and its relationship with temperature and dailygrowth during the sowing of sorghum in Nanjing was carried out. To be sorghum sowing to mature full growth period of 176 to 141 days, with the sowing delay and shorten. Sowing date tillering sowing days have a greater impact. There was a significant negative correlation between the days of sowing to emergence and the lowest temperature (r = -0.9577), and a quadratic curve with 5 cm of ground temperature. The emergence was fastest when the ground temperature was 29.9 ℃. The number of days from emergence to tiller showed a quadratic curve with the mean temperature (X) (? = 252.08-18.22X + 0.36X ~ 2, F = 33.3 ~ (**)) and the average temperature was 25.3 ℃. The shortest tillering days. The number of days from heading to maturity was significantly and negatively correlated with the mean temperature (r = -0.9475). The results showed that sowing sorghum to tiller, heading to maturity showed temperature effect. Short days of processing sorghum tillering to heading shorter days compared with the control of 38 to 54 days, we can see the sorghum tillering to heading mainly long-day effect, and with the increase of temperature short-term effect. Proposed sorghum should not be used for planting in Nanjing, harvest grass is suitable for planting in late April.