The Effect Of Different Cultivation Conditions On The Yield And Qaulity Of Smallanthus Sonchifouus In Lueyang Area

This research deal with the effect of different seedtime, planting densities and fertilizationon the yeild and quality of yacon via field experiments in Lueyang area from2010to2011;discussing effect of different factors, including seedtime, planting density, nitrogenapplication, phosphorous application and potash application on the yield and content of maincomponents of yacon. All the results provide theoretical basis to the cultivation of yacon.Themain results are as follows:1.The effect of planting density on yeild and quality of yacon: the optimal plantingdensity in Lueyang area is800sterms/667m2. On this condition, we got the best single plantyeild, average tuber root weight, total sugar content and reduced sugar content in the tuberroot. the contents of fructooligosaccharides is60.73percent of the dry matter of tuber root,only3.98percentage point lower than the highest one, there is no significant differencebetween them. The contents of total phenolic acid and total flavonoids are increasing with thedensity increasing from600sterms/667m2to1200sterms/667m2.There is no significant effecton the plant hight, main stem diameter and plant branches. In the800sterms/667m2condition,average light transmittance is lower than that of other treatments, overground parts grow best,whlie production is the largest.2.The effect of fertilization on the yeild and qaulity of yacon: the best fertilizationscheme is using farm manure2000kg/667m2in Lueyang area. This treatment produced thebest single plant yeild and average tuber root weight; the content of total sugar, reduced sugarand fructooligosaccharides are the second in four treatments. The total phenolic acid and totalflavonoids contents of each treatment have no signigificant difference. Different treatmentshave extremely significant influence on the plant height, have significant influence on theplant branches, have no significance on stem diameter. As the same as density experiment,average light transmittance of this treatment is the lowest, while production is the highest.3.Synthesis resaerch on cultivation of yacon:the result of orthogonal experiment indicatethe effect of each factor on the yeild: nitrogen fertilizer＞density＞potash fertilizer＞phosphatic fertilizer＞seedtime.The optimal level of factors are:seed in April12th,600sterm/667m~2, using nitrogen fertilizer5kg/667m~2, using phosphatic fertilizer5kg/667m~2,using potash fertilizer7.5kg/667m~2.