I have a tomato plant in cocopeat media growing well the first 1-2 fruits had this blossom end rot,heard due to over or under watering ,so I have been careful with watering .still all the subsequent tomatoes start with black streak and ends up with the rot at the bottom.any suggestions to prevent that.
I am growing tomatoes in cocopeat as well as in soil. this problem seems to occur only in cocopeat medium. This is calcium deficiency, now it may not be due to absence of calcium but because of plant's inability to absorb it. Cocopeat has a very acidic Ph, tomatoes absorb nutrients best with a Ph of 6.5.
add spoon tip of lime(used for whitewashing) to a liter of water..pour it to the base of plant.
water tomatoes regularly with neem cake tea(take some neem cake in a old sock and use it as a tea bag in a bucket, try to get a dark colour).
add any rotten milk product to cocopeat(though it might smell bad).
None of the above solutions may work but they are your best bet.
It is said that plants take care of their calcium need by just using what is already present in water.
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