What is the law of fertilizer requirement in the life cycle of tea trees? The whole development cycle of tea tree has stages and continuity. The physiological functions of different ages are different, and the demand for various nutrients is also different. The purpose of young tea trees is to cultivate strong and developed branch skeletons and deeply distributed roots. During this period, nitrogen and phosphorus are the main factors, and potassium fertilizer is applied appropriately. The middle-aged and young tea trees in the vigorous and high-yield period have also reached the peak. In order to increase the yield of fresh leaves, prolong the high-yield period and inhibit reproductive growth, nitrogen fertilizer should be applied again with phosphorus and potassium fertilizer. The physiological function of tea plants entering senescence gradually declined, and the yield and quality decreased. In order to rejuvenate the tree, re-cultivate the crown and promote the growth of new roots, it is necessary to apply nitrogen, phosphorus and potassium fertilizer together.

The law of fertilizer demand in the annual growth cycle of tea trees: The annual growth cycle of tea trees refers to the different characteristics of the growth and development process in different seasons of a year. Therefore, the law of fertilizer demand in the annual growth cycle of tea trees is not only related to the growth period of tea buds, but also closely related to the growth season. Tea buds have the characteristics of multiple germination, and the main basis of fertilization is early germination, late germination and number of rounds. At the same time, we should also consider the growth and fertilizer demand of spring tea and summer tea, and reasonably control the amount and proportion of fertilizer application. The research data show that tea plants absorb the most nitrogen in April-June, July-August and10-1month, and the absorption in the first two periods accounts for more than 53% of the total nitrogen absorption in the whole year. The absorption of phosphorus is mainly concentrated in April-July and September, accounting for about 80% of the annual phosphorus absorption. The most potassium was absorbed from July to September, accounting for 56% of the total amount in the whole year.

Tea tree absorbs nitrogen, phosphorus, potassium and many nutrients from the soil pool. Tea trees need them more or less, and the demand for individual nutrients is even minimal, but any essential element is indispensable, and its physiological effects on tea trees are irreplaceable. After being absorbed by tea trees, these nutrients not only nourish the yield and quality of tea, but also have a great influence on the subsequent processing of tea. In the fertilization management of tea trees, attention should be paid to the coordination of macro-elements and trace elements, and the coordination of organic fertilizers and inorganic fertilizers to meet the needs of tea trees for various nutrients.