How to determine the amount of fertilization and time of fertilization? (1) Fertilizer amount: At present, fertilization in Hawthorn Park is still in the experience and general contrast increase production test stage, there is no accurate, long-term quantitative, fixed-point fertilization test, nor based on leaf analysis, measurement Because of the study of soil fertilization, it is not yet possible to propose appropriate fertilization indicators that are compatible with the level of yield. However, from the fertilization experiment in the various test areas, the saplings yielded 1,500 kilograms per mu, and the organic fertilizers in Mushi were all over 3,000 kilograms; the yielding trees were 2,000 kilograms per mu, which was generally about 4,000 kilograms per acre. (2) Fertilization period; the fertilization period of hawthorn is also divided into base fertilizer and top dressing. 1 Base fertilizer, mostly applied after harvest to winter, can also be applied before germination after dormancy. According to the growth and development characteristics of hawthorn, the base fertilizer of Hawthorn should be applied before and after harvesting the fruit and before the peak of the third root growth. Therefore, when root activity moves into a strong period, it has strong absorptive capacity, quick healing of roots, and new roots that can be stored in the year to store more nutrients. It is not only beneficial to wintering trees, but also creates superior conditions for sprouting and flowering next year. Early application of basal fertilizer is also conducive to flower bud differentiation and promotion of flower bud hypertrophy. 2 top dressing, according to some units of the test, the key period of hawthorn dressing is the rapid expansion of fruit before flowering, flowering and early August and flower bud differentiation period. The proportion of nitrogen fertilizer used in each period was 15% for base fertilizer, 40% for pre-flowering, 15% for post-flowering, and 30% at the beginning of August.
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