bhal is a soil which is found near canals may be near rivers but i don't know.it is a fine type of soil because due to high volume of sand and stone it is a porous type clay.if it is watered regularly then it is very soft and if left dry then becomes stone hard.it is so much soft that even to make a gachi is very difficult breaks very easily. bhal is something between clay and sand.
i will say no...it is not necessary but useful so it is often used.often it is not better in agriculture because rice(munji) cannot be cultivated in pure bhal it cant keep water for many days which is necessary in monji cultivation.but for pot plants i think it is a major type of soil.it has good aeration so water logging is not possible.it is soft so roots are easily grown,draw back is this that regular watering is necessary.
after adding bhal in clay type soil it becomes soft and airy.so useful for pots and if further well rotted manure is added then it is a miracle grower ..
these are just my points not an experts opinion so take it as light side.as you know that i am not a perfect gardener just learner so please.
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