1. Basal fat: Li trees are deciduous fruit trees. Early spring budding, flowering, and fruit setting require large amounts of nutrients, including mineral elements. Due to the small amount of root growth during this period, the absorption function was very weak and could only be satisfied by the nutrition stored in the branches and roots.
Traditionally, the application period of Li Shujifei has been arranged in the slack season in January (Lunar New Year in December), which is before the budding of Li Shu. As mentioned above, the early spring root system did not recover function in time, but as a basal fertilizer, the tree nutrient supplement to the early spring is limited, but it has a significant role in promoting the vegetative growth of the tree in April, which contributes to a certain degree of vegetative growth and reproduction. The contradiction of growth has exacerbated physiological consequences. If the basal application time is advanced to the September peak of the second peak of growth of the plum tree roots throughout the year, the physiological activities of the roots are active during this period, and the photosynthetic and flower bud morphological differentiation (end stage) continues in the aerial parts. Roots absorb nutrients and promptly promote tree production. More organic matter is stored in the tree body to meet the nutrient requirements for sprouting and flowering in the second year of spring, and at the same time, it can improve the quality of flower bud differentiation in the year. Therefore, the application time of basal fertilization should be in the fall of September to early October.
Top dressing is applied several times a year, and according to the different tree ages and the expected output of the year, it is planned to use pre-harvest fertilizer, strong fruit fertilizer and fruit fertilizer.
2. Fertilizer before flowering: Traditional production pays great attention to the pre-harvest fertilizer, but the basal fertilizer is often combined with the pre-flowering topdressing fertilizer before flowering. According to Li Shu physiology, it can be planned that: on the premise of applying basal fertilizer in September, depending on the current year's yield, the tree vigor will be supplemented with a small amount of fast-acting fertilizer for 20 days before flowering.
3, strong fruit fertilizer: In the hardening period of fruit, the fruit is applied into the quick-acting fertilizer 7 days before the second rapid growth. From late May to June, it is still the period of physiological differentiation of plum blossom buds, which will determine the number of flower buds in the second year. Therefore, the application of strong fruit fertilizer can not only directly promote the increase in production in the year, but also the material basis for the second year of high yield guarantee. With extensive publicity and promotion, the application of strong fruits is causing the attention of Yongtai growers.
4. Picking fruit fertilizer: Before and after fruit picking in July, this time coincides with the beginning of morphological differentiation of flower buds, especially for the orchards supplied with fresh fruit. Due to the late harvest, the relative consumption of nutrients will increase. Therefore, in the orchards with higher yields in the year, the use of harvested fruit fertilizers can guarantee the high yield and stable production in the second year.
In short, the fertilization in one year should focus on basic fertilizers, which can account for 60% of the annual fertilization amount, mainly organic fertilizers, and deep-rolling in autumn. Fertilizer before flowering, strong fruit fertilizer and fruit fertilizer are the supplements of basal fertilizer. It is necessary to ensure the application of strong fruit fertilizer and fruit fertilizer in order to achieve stable production and high yield.
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