甘蔗单位面积产量的高低,受日照、降雨、积温影响甚大。尤以是在甘蔗的大伸长期间。甘蔗产量的高低,取决于甘蔗生长量的大小。甘蔗的生长量大小,又与甘蔗的生长期,特别是有效伸长期的长短关系极为密切。而影响甘蔗有效伸长期的长短,起主导作用的是气温的高低。一般来说,甘蔗的有效伸长期开始于20℃,月平均气温超过 Sugarcane yield per unit area, sunshine, rainfall, accumulated temperature greatly affected. Especially during the big cane elongation. Sugarcane production level, depending on the size of the growth of sugarcane. The size of the growth of sugarcane, but also with the growth of sugarcane, especially the effective elongation of the relationship between the length is very close. Affect the length of effective elongation of sugarcane, the leading role is the temperature level. In general, the effective elongation of sugarcane begins at 20 ℃, the monthly average temperature exceeds