Study On The Interaction Effects Of Water And Potassium Fertilizer Of Sugarcane

Sugarcane variety ROC22 as tested material which is main variety in Guangxi, effects of water and phosphorus fertilizer coupling were studied in greenhouse. The experiment designed two factors:differet water supply treatments and differet potassium fertilizer treatments. Three levers of water supply were equal to rainfall of 20mm (A1) which was low water for short in following,rainfall of 40mm (A2) which was middle water for short in following,rainfall of 60mm (A3) which was high water for short in following text from stooling stage to elongating stage.potassium fertilizer was designed four levers and in different growth and development period, potassium fertilizer supply were 0kg K2O /667m2 (B1) which was zero potassium for short in following text,12kg K2O/667m2 (B2) which was low potassium for short in following text,24kg K2O/667m2 (B3) which was middle potassium for short in following text,36kg K2O/667m2 (B4) which was high potassium for short in following tex. By controlling water and potassium rate, interaction effects of physiological and biochemical, agronomical character, yields and quality character of different water and potassium fertilizer interaction were studied.the results showed that:1 Water supply treatments:contents of relative water soluble protein, total nitrogen, total phosphorus, and activity of polyphenol oxidase, the elongation rate of stem, height, diameter, and weight per stem, number of productive tillers as well as yields and sugar productions per 667m 2 were the highest in A2 treatment.2 Potassium fertilizer supply treatments:at B2treatment, chlorophylla+b content, content of soluble protein, diameter, weight per stem as well as yields and sugar productions per 667m2 got maxvalued and water potential were lowest. Relative water content, activity of polyphenol oxidase and the elongation rate of stem from June to August were the highest by B3 treatment.3 Different treatments of water-potassium coupling:Water treatment:at A1 level, content of soluble protein, activity of polyphenol oxidase, diameter, weight per stem as well as yields and sugar productions per 667m 2were the highest in B4 treatment. At A2 level, chlorophyll content, content of soluble protein, height,diameter, weight per stem as well as yields and sugar productions per 667m 2of B2 treatment were the highest and water potential were the lowest. At A3 level, relative water content, chlorophylla+b content,soluble sugar content, activity of polyphenol oxidase and the elongation rate of stem, height,diameter, weight per stem as well as yields and sugar productions per 667m 2of B3 treatment were the highest.Potassium treatment:at B1 level,chlorophylla+bcontent,soluble sugar content,contents of total nitrogen and total potassium, height,diameter, weight per stem, number of productive tilleras well as yields and sugar productions per 667m2 of A2 treatment were the highest. At B1 level, relative water content, soluble protein content, soluble sugar content, contents of total nitrogen and total potassium, height, diameter, weight per stem, number of productive tilleras well as yields and sugar productions per 667m2 of A2 treatment were the highest. At B2level,free water content, chlorophylla+b content,soluble sugar content, activity of polyphenol oxidase, height,diameter, weight per stem as well as yields and sugar productions per 667m of A3 treatment were the highest and water potential were the lowest. At B3level, relative water content, chlorophylla+b content, soluble protein content, activity of polyphenol oxidase, contents of total nitrogen and total potassium, height, diameter, weight per stem as well as yields and sugar productions per 667m2 of A1 treatment were the highest.Synthesized and contrast all indexes of different treatments, the treatment A2B2of water-potassium couplings was the best coupling way in this experiment.