| In recent years, Chinese scientists have cultivated a Morus Alba through artificial selection and crossbreeding. They have cultivated the newest resistance strain, its regional compatibility was very strong. Morus Alba has high ecological value, nutritional value and palatability. So it was predicted to be the most potential ligneous forage plant.Therefore, in order to promote the development for the animal husbandry, and vigorously develop the new forage grass and feed resources, the forage type mulberry's natural growth rule and its High-output and High-effect comprehensive agronomy measures have been in-depth studied in this paper. The scientific theory has been provided for the forage type mulberry's mechanized and scale production.The biological characteristics of a new variety--forage type Morus alba have been observed and its growth rules have been studied in different densities by the way of single factor randomized block test in this paper. The results showed that the one-year-old forage type Morus alba's main branch ground diameter, shoot length have presented the rule, they followed the slow growth, rapid growth and the stopping growth. The rule has presented the misalignment growth way and it accorded with the Logistic mathematical model. The growth law of one-year-old forage type Morus Alba's leaf number also presented the misalignment growth way, but it accorded with the Richards mathematical model.The biological foundation of the two-years-old forage type Morus alba's three-harvest production pattern has been studied in following aspects: the two-years-old forage type Morus alba's main branch ground diameter, length and number of leaves followed the law of slow growth, rapid growth and stopping growth. They are not only in line with nonlinear growth pattern, but also accorded with the Logistic mathematical model.In order to establish a optimized cultivation technical standard of forage type Morus alba with high-effect production, Orthogonal rotatable central composite design and five factors (nitrogen fertilizer, phosphorous fertilizer, potassium fertilizer, fertilize times, mowing times) was adopted to study the relationship between leaves yield, branch yield and major cultivation techniques, income. We clarified the key factors influencing forage type Morus alba and found comprehensive cultivation techniques by establishing mathematical model, and its analysis which supplied scientific foundation for high yield and effect cultivating forage Morus alba in areas of old Yongding River.We analysed the regression equation with statistical optium choosing, dimension reduced and margin effect. The results showed the optium cultivation techniques as follows: nitrogen fertilizer(60kg per 667m~2), phosphorous fertilizer(30kg per 667m~2), potassium fertilizer (40kg per 667m~2), fertilize 3 times(april 30, June 15 and August 15 in each year, respectively), mowing 3 times(May 30, July 30 and October 15 in each year, respectively).The highest yield of the forage type Morus alba's leaf yield was 700.62kg per 667m~2 in 2007. According to the importance of each factor, the important order of factor was applying fertilizer frequency, the mowing frequency, the phosphate fertilizer, the nitrogenous fertilizer and the potassium fertilizer. The highest yield of the forage type Morus alba's branches and leaves was 1260.71kg per 667m~2 in 2007, the factors important order was the mowing frequency; the applying fertilize frequency, the potassium fertilizer, the nitrogenous fertilizer and the phosphate fertilizer.In this paper, such analyzing methods as the regression equation, statistical optimum choosing, the analysis of dimension reduced and margin effect have been used to analyze the data that resulted from experiment.The relationships between each factor and yield of forage type Morus alba were all in line with twice-kind parabola. The highest interrelated numerical values between each factor and yield of forage type Morus alba presented on level 0 of experimental code. As far as the production of the forage type Morus alba's leaves was concerned, there are interactions among factors, The most obvious interaction was the interaction between the nitrogenous fertilizer and the mowing frequency, secondly, between the nitrogenous fertilizer and mowing frequency: but in yields of branch and leaves, the most obvious interaction was the interaction between the nitrogenous fertilizer and the phosphate fertilizer, secondly, between the nitrogenous fertilizer and the potassium fertilizer.Among the different cultivation measures, the principal measure should be considered, while the negligible and sole measure all should be used.The experiment indicated that various factors were under the 0 level of experimental code value, along with the factor level's enhancement, the output growth effect was remarkable and achieved the maximum production when in the 0 level of experimental code value. Various factors were above the 0 level of experimental code value, the output no longer grows along with the factor level's enhancement, but it has dropping trend. After the marginal yield analysis, various factors are under the 0 level of experimental code value, the function of increasing production is obvious and the efficiency is remarkable.Therefore, in the production, we should pay attention to the relationship among the five cultivation techniques: mowing at the right time, applying fertilizer rationally, matching the nitrogenous fertilizer, the potassium and phosphate fertilizer. Only in this way, all factors can play its comprehensive effect in production increase.The natural growth of one-year-old forage type Morus alba and two-years-old forage type Morus alba's three-harvest production pattern have been studied in following aspects: the two-years-old type Morus alba's main branch ground diameter, length and number of leaves. Their growth mathematical simulation models have been proposed, so they may facilitate the understanding for forage type mulberry orchard's limit output and limit growth speed under the current cultivation condition, and they may forecast in following aspects: the forage type mulberry's growth speed, the highest growth quantity, and the number of leaves ,and so on multiple items of forage type mulberry growth index, so as to help predict the change law of the growth of forage type Mulberry in the future.Orthogonal rotatable central composite design was adopted to replace the comprehensive test with the part experiment. A lot of the experimental work load was reduced greatly, and the multi-factor field test to implement came into possibly, thus meeting needs of the agricultural production engineering research. So, this design method is an advanced, practical method concerned multifactor experiment research.According to the characteristic of forage type mulberry, the local production condition and the operational main factors for farmers, Orthogonal rotatable central composite design and five factors were adopted to study the forage type mulberry production. It is one simple effective method and feeds back the valuable information. It overcomes the insufficiency which the routine-test cannot attend to one thing without losing track of another thing. Simultaneously the agricultural system project theory and the computer technology opened up a new way in practice's application; this research has the realistic feasibility and the production guiding sense for the forage type mulberry High-output and High-effect optimization cultivation pattern.
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