| In order to confirm the effect of different nutrient concentration to tree growth and fruit development and a suitable way of fertilization and water management, we did some research on vegetative growth, fruit quality, content of mineral elements in leaves and fruits in the 3-year-old peach(Prunus persica c.v.'qingshui') to did with N 50 mg.L-1, N 100 mg.L-1 and N 200 mg.L-1( on the basis of nitrogen content) and 12-year-old peach(Prunus persica c.v.'DaTuan milu') concerning partial rooting-zone fertilization.The results showed:1. N 100 mg.L-1more promoted vegetative growth (shoot length and diameter, trunk diameter). The total shoot growth and leaf area of N 100 mg.L-1 were larger throughout the year. Net photosynthesis rate increased,and the stomata conductance was larger than others.2. Although fruit diameter, fruit weight, soluble total sugar and soluble solid in N200 mg.L-1were better than N 100 mg.L-1, there were no significant difference among treatments. 3. The analysis about mature fruit and leaf mineral element content of peach showed: The dry matter content of fruit and leaves were no significant differences between treatments. The trace elements Fe and Cu of mature fruit in N 100 mg.L-1 was higher than that in N 200 mg.L-1. Along with the fruit growth, P, K, Ca, Fe, Zn, Mn, Cu elements of in N 100mg.L-1 treatment were relatively higher content than the other treatments,and the treatment on mineral element content was maintained in the normal range of values.4. During the whole growth and development, NO3-1-N, NH4 +-N, P, K, Mg, Ca, Fe,Mn,Zn and Cu uptake were proportional to nutrient solution concentration, and tree traits with N 100mg.L-1 treatment were better,so we took medium nitrogen as fertilizer reference, amount of fertilizer per acre and Water consumption5. Compared partial root-zone fertilization method with traditional fertilization method: partial root-zone fertilization had positive effect on soil nutrient, especially improving the contents of organic matter, Nitrate nitrogen,P and K,and from the blossom period to fruit maturity, these nutrients decreased slower than the control,and the soil organic matter, the various elements of the content and the proportion tends gradually reasonable.6. Compared with a control group, the shoot length and shoot diameter was smaller. In various developmental stages,though fruit transverse, fruit vertical, fruit trailand fruit mass of partial root-zone fertilization method was greater than that of the traditional method,there were no significant difference. During early fruit development, fruit soluble solid content of partial root-zone fertilization method was significantly higher than that of traditional method.However, fruit titratable acid of partial root-zone fertilization method was significantly higher than that of traditional method,but to maturity both significant differences disappeared.7. Two methods of applying fertilizers on the change of large number elements and trace elements content in leaves and fruit has significant influence. Most trace elements in leaves of partial root-zone fertilization method was significantly higher than that of traditional method,in particular elements of Fe and Mn,while in the mature period Zn element had no significant differences.Expect Mn, trace elements in fruit of partial root-zone fertilization method was lower than that of traditional method, especially in Fe and Zn,and this phenomenon occured in every growth stages. |
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