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Body in a broad survey of the situation of soil fertility in the mountains of southern Fujian and eucalyptus plantations nutrient concentrations , cf. Soil classification standard view , the Minnan mountain organic matter content is low level ; nitrogen is low or the lack of a level ; Phosphorus deficiency lack or extremely ; full potassium uneven distribution , but available potassium is low or lack of status ; calcium, low magnesium content ; copper content than adequate ; uneven distribution of zinc , the whole moderately low ; B is more lack and most widespread lack of forest soil . View the results of elemental analysis on the various parts of the plant body of urophylla Eucalyptus , in the sticks , rods , bark, leaves , the nutrient content in the leaf which is the highest . View from nutrient uptake to nitrogen uptake , nutrient uptake order of Ca gt ; K gt ; Mg gt ; P gt ; Zn gt ; B Quadratic general rotary design method , calcium and magnesium phosphate , urea , compound fertilizer , the B fertilizer four kinds of fertilizers tail giant eucalyptus plantation 4 factors and 5 levels , positioning fertilization experiment results show that : the fertilizer applied to continuing to increase growth the amount of fertilizer use in eucalyptus plantations can effectively improve the timber accumulation ; B fertilizer can increase growth , to achieve the best results when the application rate of 30 g borax B fertilizer application rates continue to increase and will not promote growth ; calcium magnesium phosphate and urea only 350 grams and 100 grams above only has a promoting effect of significantly below this combination of growth promoting effect . And preliminary fertilization ratio of the maximum yield : 30 g plant application of calcium and magnesium phosphate 500 g , 200 g of urea , compound fertilizer 500 grams , B fertilizer . Is calculated by the optimal concentration method leaf nutrient suitable range of N (19.097 ~ 24.984 g.kg-1), P (0.803 ~ 1.132 g.kg-1), K (20.514 ~ 30.566 g.kg-1), Ca ( 0.951 ~ 2.843 g.kg-1), Mg (0.929 ~ 1.663 g.kg-1), Cu (5.313 ~ 7.043 mg.kg-1), Zn (19.102 ~ 27.898 mg.kg-1), B (9.979 ~ 12.8994 mg.kg-1), can be used for leaf nutrient diagnosis standards , can also be used to calculate the amount of fertilization combined with biomass and the rate of absorption of various nutrients . The last the application vector graphic analysis method , compare different fertilizer treatments leaves nutrient interactions with antagonistic effect analysis results closer to optimum concentration method .
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