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正确掌握培育适龄秧苗,一般是以叶片数来确定秧龄适宜期,也可以用有效积温作为适龄秧的指标。温度直接同秧苗的生长速度有关,经对我县徐泾公社徐泾八队连续三年早稻超千斤田块秧龄的调查,同是二九青品种,从秧龄比较,1974年与1975年相差5天,从有效积温看仅相差5°,还不足一天的生育期(表1)。尽
Correct grasp of age-appropriate seedlings, usually based on the number of leaves to determine the appropriate age seedling, you can also use the effective accumulated temperature as an indicator of age seedlings. The temperature is directly related to the growth rate of the seedlings. The survey on the seedling age of ultra-kilograms of early rice in Xujing, Xujing commune, eight teams in the same county for the third consecutive year showed the same as that of the second seedlings. Compared with the seedling age, the difference between 1974 and 1975 was 5 Days, only a difference of 5 ° from the effective accumulated temperature, less than one day’s growth period (Table 1). Do