Rock phosphate is allowed in a bio tea garden. PzOs @ 50 kg per hectare per year in the form of Rock Phosphate can be applied. Wood ash is a good source of Potassium in organic form. Apart from using Potash bacteria - Frateuria aurentia @ 2.5 kg per hectare, wood ash can be used to replenish Potassium in the soil. Wood ash can be obtained by burning shade tree loppings etc. Dose can be ascertained by determining the Potassium content of the wood ash in a recognized laboratory.
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