Abstract:

【Objective】The purpose of this paper is to devise and select valuable botanical organic fertilizers with good effect on young pear trees growing in sandy soil. 【Method】Thinking of maximum nutrition, single element and balance of all the nutrition elements, composition was as follows: Glycine maa Merrill, Phaseolus aureus Rosa, Trifolium repens L., Medicago sativa L., Astragalus adsurgens Pall were selected as basic materials for organic fertilizer, 5(T1-T5) out of 32 decomposed manures designed by orthogonal design were selected in this paper, using farmyard manure (T6) and without manure (T7) as controls. The nutrition condition of soil and young pear tree leaves was investigated. 【Result】Compared with CK(No fertilizer and manure), fertilizer processing could improve the organic matter content of the soil, also with increased mineral elements, the soil moisture remained higher than that of CK, the height and diameter of young pear tree enhanced, the accumulation of dry matter was more than that of control. At the same time, the net photosynthesis rate and water use efficiency were better than that of control. T1 had a significant effect on the content of soil K, N, exchangeable Ca, available Fe, organic matter content, the same effects were also found on the leaf Ca and Fe content. While taking soil available Cu, the leaf K, Cu content and leaf dry matter as all, T2 was the best of all treatments. As for the content of soil available K, Mn, leaf Mn and photosynthetic rate, T3 was the best among all the treatments. T4 had good effect on soil exchangeable Mg, available Zn, and the highest leaf N, Mg and Zn content, the height of young pear tree was found in this treatment.【Conclusion】The tested organic fertilizers had good effect on improving soil organic matter content, remaining higher soil moisture, keeping balance of all elements, soil capacity of nutrient supplying, all those contributed to the better growth condition of the young pear tree, especially T1, T2.