| Cultivation history of sugar beet in Jilin province is only 50 years. Study of sugar cultivation technique is limited to study of single cultivation technique. Single cultivation technique study can only confirm one technique in a given condition, which cannot solve actual problem due to comprehensive factors; therefore function of single technique shall not be fulfilled in terms of high yield and high sugar. In recent years, through research result and advanced experience of farmers'planting, on basis of test and demonstration, in view of ecology, new result, new technique, new variety and new method of single technique shall be assembled and constructed into overall culture technique system by use of quantitative and qualitative analysis. Through control and modulation of agronomy, to harmonize growth of sugar beet with the associated environment conditions, the target of high yield, stable yield, high quality and low consumption of sugar beet shall be realized.Study method of the technique system is as follows: I. Field test is combined with extensive demonstration to conduct feedback calibration and to transfer study result into actual productivity as soon as possible; 2. Single culture technique is assembled into comprehensive culture technique, make full use of production potential of variety and culture technique, to improve use efficiency of land and fertilizer, to realize rational close planting, make full use of light energy to construct4complementary, restrained and progressive high-yield and high-sugar comprehensive culture technique system; 3. To improve field seedlings survival rate and rational close planting, to establish harmonious structure of individual in large group to realize the target of high yield and high sugar;4 Management method of "to promote antecedent growth, to control post growth result" shall be adopted to improve photosynthetic capacity of sugar beet and distribution of its products;5 Economical-III-adequate fertilization, to balance the proportion of nitrogen. Phosphorus, potassium, to ensure density with fertilizer to ensure yield increase with proper density, to make full use of role of fertilizer in formation of root tuber and in material distribution, economic benefit shall be increased; 6.Orthogonal design shall be adopted in fielcj test, direct-seeding culture technique and paper-pot seedling growth transplant technique are adopted in culture technique; 7 Comprehensive pest control system, shall be established.On basis of investigation and comprehensive treatment study of low-yield and . low-sugar of sugar-beet in Jilin province made by Jilin Sugarbeet * Sugar Institute in year 1984-1987,it is indicated that variety of sugar-beet, density, fertilization levej and method shall play an important role in increase of yield and sugar content of sugar-beet. Study shows that sequence of affecting yield and sugar content of sugar beet is: variety of sugar beet, amount of nitrogen fertilized, density, and amount of phosphorus fertilized. Therefore, in selection of key factors of the technique systerp, study on variety allocation, group structure test of sugar-beet, nutrition balanced fertilization test of sugar-beet are conducted to simply, to optimize and assemble the high-yield and high-sugar comprehensive culture technique systemIn terms of variety allocation, in middle part of Jilin province, high-yield type with strong disease-resistance, standard type and high-sugar type shall be used jn proper proportions. Use proportions are: high-yield type accounts for 60%, i|s representative type is Jitian 301, standard type accounts for 20%, its representative type is Jitian No. 1; high-sugar type accounts for 20%, its representative type is Jitian 207.In this way, yield of sugar-beet shall be increase, sugar content shall b癳 stabilized and total yield of sugar-beet is ensured. The reason is: most of soil jn middle part of Jilin province is black earth, soil is viscous, high temperature, rainy, which belongs to low-sugar planting area of sugar-beet In western par...
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