Insufficient amount of organic fertilizer for tea plantation, poor soil fertility and poor water retention and fertilizer retention. Some tea gardens use high nitrogen fertilizers, and the proportion of phosphorus and potassium fertilizers is insufficient. Mg, S, and B, such as trace elements, occur frequently, and excessive application of nitrogen fertilizer in tea gardens leads to soil acidification. The phenomenon is more general and other issues, the Ministry of Agriculture expert group put forward the following principles of fertilization:
1, increase organic fertilizer, organic and inorganic application.
2, according to the soil fertility conditions and yield levels, appropriate to reduce the amount of nitrogen fertilizer, strengthen the combined application of phosphorus, potassium, magnesium fertilizer, pay attention to sulfur, boron and other nutrients.
3. Tea gardens where soil acidification occurs can be improved by applying dolomite powder, quicklime, etc.
4, combined with high yield and high quality cultivation techniques.
Fertilizer amount and method
1. Normal production of tea garden nitrogen fertilizer (N) 20-30 kg / mu, phosphate fertilizer (P2O5) 4-6 kg / mu, potassium fertilizer (K2O) 6-10 kg / mu.
2. The magnesium-, zinc-, and boron-containing tea gardens use MgO fertilizer 2-3 kg/mu, zinc sulfate (ZnSO47H2O) 0.7-1 kg/mu, and borax (Na2B4O710H2O) 1 kg/mu.
3. Sulfur-depleting tea gardens choose sulfurous fertilizers such as ammonium sulfate, potassium sulfate, and superphosphate. Fertilizer operations throughout the year. In principle, organic fertilizer, phosphorus, potassium, and magnesium are mainly used in autumn and winter basal fertilizers, and nitrogenous fertilizers are applied in divided portions. Among them, base fertilizer: apply all organic fertilizers, phosphorus, potassium, magnesium, trace element fertilizers, and nitrogen fertilizers that account for 30-40% of the annual amount. Fertilization is suitable for the period between the end of September and the end of October after the end of the tea season. Deep plowing application depth of about 20 cm. Topdressing is generally based on nitrogen fertilizers. The top dressing period is determined based on the growth of tea trees and tea picking. The germination fertilizer is applied about 30 days before picking spring tea, accounting for 30-40% of the annual consumption. Summer tea top dressing ends at the end of spring tea. Before summer tea begins to grow, usually in mid-to-late May, the dosage is about 20% of the whole year. Autumn tea top dressing is performed after the end of summer tea, and is usually applied in mid-late July. The dosage is about 20% of the whole year.
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