Top dressing to promote shoots
(1) Furrow or spreading: strip-planted tea gardens are fertilized between planting borders or a small furrow is pulled on one side, and the soil is restored after application; large borders are densely planted tea gardens, which can be sprinkled on the borders before or after the rain. Apply 5 to 10 kg of urea or 7.5 to 10 kg of potassium sulfate compound fertilizer per mu in young orchards, and apply 10 to 15 kg of urea or 15 to 20 kg of potassium sulfate compound fertilizer plus 5 kg of urea per mu in adult tea gardens.
(2) Spraying outside the roots: During the development period of the first bud, second and third leaves, choose cloudy or sunny day and spray 0.5-1% urea solution in the morning and evening.
Soil cover
If the soil is dry after May, in order to ensure the water needs of the tea shoots, it is necessary to keep the soil moist and ensure water supply. For this reason, soil mulching measures should be taken to cover the planting borders with 5-8 cm thick weeds or straws. Or remove the grass to cover the border surface with the cultivator.
The prevention and control of diseases and insects focuses on preventing green leafhoppers, black spiny whiteflies and mites from harming the shoots in summer and autumn.
Tea green leafhopper: (1) Control indicators: The amount of louver is more than 6 (46 per hundred leaves) or more than 15 per square meter.
(2) Agricultural measures: Strengthen the management of tea gardens, remove weeds in tea gardens, and deteriorate the habitat; timely picking in batches multiple times can reduce insect eggs and worsen nutritional conditions and reduce damage.
(3) Chemical control: before the peak of nymphs, you can use any of the following chemical spray control: insects and mites 1000 times (5 days, the safety interval, the same below) or 10% imidacloprid 2000 to 3000 times (7-10 days) , 25% Aketai Moisture Powder 15000～20,000 times (7～10 days), 1.1% Green Wave 1000～1500 times (7～10 days), 2.5% Uranus 3000～6000 times (7～10 days) , 0.2% matrine water solution 600 times (7 days), spray around the tea garden first when spraying, spray from the outside to the inside.
Black spiny whitefly: (1) Cut off the dense pest branches, promote ventilation and light transmission, promptly tillage, fertilize, enhance tree vigor, and improve plant resistance to insects.
(2) The control index is 2 leaf insects on average, which means it should be controlled. When the first-instar larvae account for 80% and the second-instar larvae account for 20%, the control period is suitable.
(3) Chemical control: 50% phoxim EC 1000 times liquid, 2.5% Uranus EC 1500-2000 times liquid, and 25% Proxim EC 1000 times liquid can be used. The safety interval is 5 days, 6 days and 14 days.
(4) Black spiny whiteflies are mostly found on the back of tea leaves. Pay attention to spray evenly when spraying. Tea gardens with serious occurrences can also be controlled during the blooming period of adults.
Mites: (1) Agricultural control: timely remove mites eggs and leaves in the central area where mites occur.
(2)Pharmaceutical control: 0.9% insect mites gram 1000-2000 times liquid, 15% mitoxone EC 300 times liquid, 73% gmite 2000 times liquid; non-picking period uses 45% lime sulfur mixture crystal 200-300 times liquid.
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