The Research On The Ratoon Sugarcane Seedling Etiolation And The Relationship Between The Supply And Absorption Of Mineral Nutrition

The experiment chose the sugarcane areas where ratoon sugarcane seedlings etiolated severely in Nanning、Chongzuo etc to investigate, collected soil, root, leaf samples,then determined the samples’ nutrient element contents and the soil pH、root activity、 chloropHyll content,to explore the mechanism of ratoon sugarcane seedling etiolation from the nutrition point of view. The test results were as follows:1.The soil pH, organic matter, total N, total P, available N, available P, effective Fe, effective Mn, effective Cu, effective Zn, exchangeable Mg contents of etiolation sugarcane lands were lower than normal sugarcane lands and new planting sugarcane lands significantly or highly significantly,but the total K, available K, effective S and active Al contents were higher than normal sugarcane lands and new planting sugarcane lands significantly or highly significantly. The active Al content of etiolation sugarcane lands was negatively correlated with the effective Fe content highly significantly, negatively correlated with organic matter content、available P content、effective Cu content significantly, negatively correlated with soil pH、effective Zn content、effective Mn content.2.The root activity of etiolated seedling roots was lower than normal seedling roots and new planting sugarcane roots highly significantly.Total Al content of etiolated seedling roots was higher than normal seedling roots and new planting sugarcane roots highly significantly.Excepted total N, total P content、total K content of etiolated seedling roots were all lower than normal seedling roots and new planting sugarcane roots highly significantly.The total Mg、total S、total Fe、total Mn、total Zn、total B contents of etiolated seedling roots were lower than normal seedling roots and new planting sugarcane roots significantly or highly significantly.The total Al content of etiolated seedling roots was negatively correlated with the root activity significantly, negatively correlated with the total N、total Zn、total Mg、total B、total Mn contents.3.The chloropHyll content of etiolated seedlings was lower than normal seedlings and new planting sugarcane seedlings highly significantly.The total N、total S、active Fe contents of etiolated seedlings were lower than normal seedlings and new planting sugarcane seedlings highly significantly,but total P、total K、total Mn、total Cu、total Zn、 total M、total B、total Al contents were higher than normal seedlings and new planting sugarcane seedlings significantly or highly significantly.The chloropHyll content of etiolated seedlings was positively correlated with the total S content significantly, positively correlated with the total N content,negatively correlated with total Al content highly significantly,negatively correlated with total K content significantly,negatively correlated with total P、total Fe、total Mn、total Cu、total Zn、total Mg、total B contents.The total Al content of etiolated seedlings was negatively correlated with total S content significantly, negatively correlated with total N content, positively correlated with total K content significantly, positively correlated with total P、total Fe、total Mn、total Cu、total Zn、total Mg、total B contents.