It was studied that the quantitative relation between high yield and main cultivation factor by using field trial and quantitative analysis,established relative mathematics model and made increased effect analysis.

Effect of cultivation way on Rapeseed Guiza 4 yield and characterIn transplants under the condition to use three factor two grouping combination experiment and uses three Yuan two return orthogonal combination design under the direct seeding condition the rape to conduct the research to "guiza 4", has analyzed each cultivation factor to the rape "guiza 4" the output and the character influence effect, according to the above formulates the high production cultural technique optimum composition.

The quantitative relation between high yield and main cultivation factor was conducted by using field (experiment) and quantitative analysis for establishing relative mathematical model, and the effect for raising yield was analyzed.

The hydrolyzed N content of soil in heading stage was a key cultivation factor determining the quality level of Zhengmai 9023. The hydrolyzed N critical values of sub-strong gluten, strong gluten and super-strong gluten were respectively about 60, 80 and 160 mg/kg for Zhengmai 9023. K fertility had positive effect and P fertility had negative effect on the strong gluten characteristics.

according to the result: main cultivation factor that affect yield of youyan 10. is to sows the period, the second the age of the seedling, fertilizer and density。

(2)the laws and degrees of the effects of one cultivation factor on wheat yield were different,which was based on the ecological condition and the levels of other cultivation factors.

4. The experiment studies the potato character of the growth and development under ideal water and fertilizer and analyzes the cultivation factor with relation of the yield character, quality character.

All of the resultes have much to do with the cultivation factor,such as the adjustment of planting institution,popularization of high quality rice,postphone of seeding time and planting time,and promotion of no-tillage technology.

In this article, the accumulation and distribution of nicotine in tobacco plants were researched and the influence of genetic, ecological and cultivation factor on nicotine content was analyzed. The controlling measures to the nicotine were also presented.

The design method of quadratic orthogonal ratation regression has been applied in the present experiment to study the relationship between soybean yield and the primary factors of soybean cultivation : density, nitrogen fertilizer (carbamide), phosphorus (threefold calcium superphosphate), and potassium (potassium sulphate). The yield function model of the soybean cultivar "Heihe 54", which adapted in the fourth accumulate temperature zone of Heilongjiang province, applied with integrated agricultural...

The design method of quadratic orthogonal ratation regression has been applied in the present experiment to study the relationship between soybean yield and the primary factors of soybean cultivation : density, nitrogen fertilizer (carbamide), phosphorus (threefold calcium superphosphate), and potassium (potassium sulphate). The yield function model of the soybean cultivar "Heihe 54", which adapted in the fourth accumulate temperature zone of Heilongjiang province, applied with integrated agricultural measures has been set up in the present Study. Analyzing the primary composition, the effect rank of these cultivation factors on yield has been determined as follow : density > carbamide>threefold calcium suporphosphate>potassium sulphate. The boundary yield analysis conducted in this study may provide the economical benefic of various factors. Through the frequency analysis, the integrated agricultural measures for obtaining the yield of 260 jin/mu are : density : 43.5-44.6 plants/m2; the dosage of carbamide : 4.9-5.1 jin, ma and threefold calcium superphosphate 8.6-8.8 jin/mu. Since the frequency distribution of potassium sulphate is disperse, it indicates that potassium fertilizer is ineffective in this region.

A 3-years(1984～1986) study was conducted to determine the effect of N, P, and K levels on lint yield and quality of cotton (Gossypium hirsutum L. ) . Simulation quadrutive regression models of lint yield and fiber quality were established. Comprehensive agronomic measures for high productivity, quality and lowcost have been worked out. The results from this study showed evident effects of N, P, K. levels on lint yield (P<0.05) , and the regression model was significant ( P<0.001 ) , of which N had the biggest...

A 3-years(1984～1986) study was conducted to determine the effect of N, P, and K levels on lint yield and quality of cotton (Gossypium hirsutum L. ) . Simulation quadrutive regression models of lint yield and fiber quality were established. Comprehensive agronomic measures for high productivity, quality and lowcost have been worked out. The results from this study showed evident effects of N, P, K. levels on lint yield (P<0.05) , and the regression model was significant ( P<0.001 ) , of which N had the biggest effect followed by P and K. N, P, K levels as cultivation factors affect on fiber quality obviously. The effect of N, P, K on fiber length was more sighificant than on fiber strength and fineness Maximum effect of the factors on fiber quality was 50% span length ( P<0.05 ) . The effect of the factors on riber quality was N>K>P.The result indicated no significant relaivity of lint yield and fiber quality ( except for fiber fineness ) . Therefore, lint yield and fiber quality are independent aspects for cultivation.

The design method of quadratic rotation regression has been applied in the present experiment to study the relationship between soybean yield and the primary factors of soybean cultivation: density, nitrogen ( carbamide ) , phosphorus ( calcium superphosphate ) .Analyzing the primary composition, the effect rank of these cultivation factors on yield has been determind as follow: den(?)ty>carbamide>calcium superphosphate.