Soilless grow bag is new trend in rooftop farming
Rooftop farming does not require soil, proves Agriculture Assistant Officer John Shery. He filled grow bags with a mix of rice husk ash (Umikkari in Malayalam) and organic fertilisers and successfully experimented soilless grow bag farming.
Silica, carbon, calcium, magnesium and other elements in rice husk ash give strength to the plants. As they ensure more air circulation inside grow bags, the roots grow faster and the yield also improves. The plants get better immunity as well. Also the total weight of the grow bag can be reduced.
How to prepare soilless grow bag
Some burnt rice husk ash and some without burning should be mixed in 1:1 ratio. Place a layer of this mixture in grow bag then a layer of coconut husk and then a layer of cow dung powder.
Repeat these layers in the grow bag. On top of it, put a 4-inch thick layer of coconut husk and cow dung powder. About 3/4 of the grow bag should be filled like this.
Fix a 1-inch pipe in the middle of the bag and fill rice husk ash through it. The content should be tightly filled in the bag. Otherwise, the bags may fall due to the weight of the plant.
It is ideal to place the grow bags in plastic trays. This will help to collect the water leaking from the bags and later absorb back when the potting mixture gets dried.