Effects of Handilong,a Nutrition Regulator on Mineral Nutrients and Photosynthetic Characteristics of Sugarcane

ZHOU Zhugui; LU Guoying; LIN Shanhai; MAN Ruojun

doi:10.3969/j.issn.1004-3268.2013.10.009

Abstract：For further determining the regulatory mechanism of Handilong in sugarcane plants ,the effect of different concentrations of the regulator on the mineral nutrients and photosynthetic characteristics in sugarcane variety ROC22 was investigated during the period of growth elonga-tion .The results showed that the levels of mineral nutrients in sugarcane leaves increased markedly by spraying Handilong regulator .When treated with 3 g/L ,2 g/L and 4 g/L of Handi-long ,sugarcane had a best absorbability to nitrogen ,phosphorus and potassium mineral elements with the average value of 0 .13 ,0 .04 ,0 .12 percent points more than the control sprayed with tap water ,respectively .In the analysis of photosynthetic indices ,3 g/L and 4 g/L of Handilong regu-lators were the best for increasing the chlorophyll and stomatal conductance with the average in-crease of 0 .19 mg/g and 0 .05 μmol/(m2 · s) ,respectively .The photosynthetic and transpiration rates of all treatments were higher than the control in the elongation period ,especially the concentration of 4 g/L , w hich increased the tw o rates by 4 .94 μmol/(m2 · s) and 0.42 mmol/(m2 · s) .T he paper show ed that the variation trend of stomatal conductance was consistent with that of net photosynthetic rate ,and spra-ying 4 g/L Handilong regulator increased stomatal conductance to 0 .32μmol/(m2 · s) .The results sug-gest that application of Handilong is favorable for the absorbability of nitrogen ,phosphorus and po-tassium elements in sugarcane plant ,increasing the content of chlorophyll ,and promoting photosynthesis .