SPAD and Nitrogen in Sugarcane Leaves

SPAD and total nitrogen content of the 1st leaves from the tip of asugarcane plant were determined.Correlation between the two measurements during the growth periods of the plants farmed in Yunnan and Guangxi provinces was studied.The results showed that(1)the leaf SPAD of the sugarcanes in Guangxi was higher than that in Yunnan,but the nitrogen contents were similar;(2)SPAD and total nitrogen were higher at plant maturation in November than when the leaves continued to elongate in August;(3)a significant correlation was found between the leaf SPAD and total nitrogen on plants in Guangxi,but not between them on those in Yunnan.