A Study On Cultivation Conditions For High Yield And Stalk Storage Of Sweet Sorghum

Sweet sorghum, having a rapid growth rate and more significant yield potential, is known as "high energy crop". Development in sweet sorghum cultivation is vital in maintaining safety of energy, food and environment in consideration of the exploitation of bio-energy made from the resource of no-maple food nowadays. Inner Mongolia, with vast land resources, suits for large-scale sweet sorghum growth for industrialization. In this study, the cultivation conditions on high quality and yield sweet sorghum planting, soluble sugar extraction and detection techniques, high resistant varieties screening and breeding, the pattern of glycometabolism at different growth stages and the storage methods of the straw were explored. The main results are as following:1. Optimum cultivation conditions in Hohhot is urea 132 kg/hm2, diamine 93 kg/hm2, potassium sulfate 159 kg/hm2 with density at 120,000/hm2; In Linxi County of Chifeng, the optimum cultivation conditions is urea 132 kg/ hm2, diamine 186 kg/hm2, potassium sulfate 159 kg/hm2 and density at 120,000/hm2.2. Static electricity treatment increased glucose and fructose content, but had no significant effect on the total sugar content of sweet sorghum straw; the optimum static electricity dose is 2.0 KV/cm×5min, the sweet sorghum biomass and dry matter accumulation were improved at this dose treatment.3. The tolerance concentration of PEG is from 0 to 20% for sweet sorghum at germination stage, and the concentration range of NaCl tolerance is form 0 to 550mmol/L; Seed germination is inhibited with increasing concentration of PEG and NaCl.4. Temperature and extraction time are the major factors that affected soluble sugar extraction rate by HPLC detection. The optimum condition is extracting one hour at 70℃with solid-liquid ratio of 1:20.5. The effect of different storage methods on the sugar content of sweet sorghum stalk was significant. Scattering in the field after harvesting was the best. It had no obvious effect among four kinds of storage methods on Brix, pH value, mineral element and amino acid content of sweet sorghum stalks. The total sugar content of sweet sorghum stalk among four kinds of storage methods had no striking difference, but the glucose and fructose content in stalk that scattering in the field and not-harvested were slightly higher than the other two storage menthds.