The Influence Of Different Fertilizer Combinations On The Growth Of Replant Apple-orchard

Due to the lack of nutrients in the soil of replant apple-orchards and the nutritional disorders in newly planted trees,the growth and development of young replant apple trees and the yield and the quality of fruit trees were seriously affected.The fertilizer is an important material guarantee the normal development of the fruit trees.Replant obstacles was influenced by adjust the soil nutrition apply from the fertilizer.In this study,the three years old replant apple trees were used as test materials.Fertilization schemes were consisted by some combinations with different fertilizer type and different seasons in spring,summer and autumn.Improving the soil environment of replant orchard and the effects of replantation on growth and development of young apple trees was discussed, in order to provide some technical references for solving the problem of continuous cropping obstacle by fertilization means.The main obtained results are as follows.1. Annual growth of plant height and stem diameter, the obstacles of continuous cropping was obviously overcome by the fertilizer combination of chemical fertilizer used in summer and organic biology compound fertilizer used in autumn(treat F),which was even better than that of non continuous control treatment(treat J).Beyond that,the fertilizer combination of chemical fertilizer used in summer and biogas fertilizer used in autumn(treat H) gave a good performance which was similar to the non replant treatment(treat J).2. In addition to the influence of single application of chemical fertilizer(treat B and C)to improve the apple fruit set rate is very weak,a significantly increase can be seen in other treatments.The most significant performance in increasing the apple fruit set rate is the fertilizer combination of chemical fertilizer used in summer and organic biology compound fertilizer used in autumn(treat F),the index was consistent with the non continuous control treatment(treat J).3. A significant improve in fresh leaf weight and leaf dry matter quantity can be seen in different treatment of fertilizer combinations,but the influence mechanism to fresh leaf weight and dry matter quantity was inconsistent.The most significantly influence of fresh leaf weight were shown in the fertilizer combination of chemical fertilizer used in summer and organic biology compound fertilizer used in autumn(treat F),the fertilizer combination of chemical fertilizer used in summer andorganic biology compound fertilizer used in spring(treat G).While the most significantly influence of leaf dry matter quantity were shown in the fertilizer combination of chemical fertilizer used in summer and the same used in spring(treat C),the fertilizer combination of chemical fertilizer used in summer and farmyard manure used in spring(treat E),the fertilizer combination of chemical fertilizer used in summer and farmyard manure used in autumn(treat D).All of them were close to the level of non cropping trees.4. All of the different treatment of fertilizer combinations showed a significantly increase of leaf photosynthetic capacity.But its effect mechanism was not performed in improving the content of chlorophyll.In strengthening the capacity of photosynthesis,significantly performance were shown in the fertilizer combination of chemical fertilizer and organic biology compound fertilizer(treat F and G),the fertilizer combination of chemical fertilizer and biogas manure(treat H and I),all of them were at the same level as the non continuous control treatment(treat J).5. A significantly increase in total N,total K and total P of main mineral elements in leave can be seen in different treatment of fertilizer combinations.The most significantly performance were shown in the fertilizer combination of chemical fertilizer used in summer and organic biology compound fertilizer used in autumn(treat F).6. On the indexes of the content of ammonium nitrogen, nitrate nitrogen, available phosphorus and available potassium in 0-20 cm of shallow soil and 20-40 cm in the middle,the most significantly influence were shown in the fertilizer combination of chemical fertilizer used in summer and organic biology compound fertilizer used in autumn(treat F),the fertilizer combination of chemical fertilizer used in summer and biogas fertilizer used in autumn(treat H),the fertilizer combination of chemical fertilizer used in summer and organic biology compound fertilizer used in spring(treat G).The levels of content were basically the same or different degrees of increase with the non continuous control treatment(treat J).Instead,the content of ammonium nitrogen,nitrate nitrogen,available phosphorus and available potassium in 40-60 cm of deep soil were keeping balance between all the different treatment of fertilizer combinations.7. In conclusio,the fertilization combination of fertilization used in summer and organic biology compound fertilizer used in autumn(treat F) can perfect the soil environment of continuous cropping orchard and the influence of replantation to the growth and development of apple saplings significantly.The treat could been the best fertilizer combination in this test.