पराली मशरूम की खेती की प्रणाली

01A mushroom built for heat

Paddy straw mushroom is Volvariella volvacea. Growers in Odisha and Bengal call it parali or chhatu. It is a warm-climate fungus. Its mycelium, the white thread network that is the living body of the fungus, runs fastest in heat that would kill button mushroom mycelium. The ICAR-DMR species table gives spawn run, the days when mycelium spreads through the straw, at 32 to 34 °C and fruiting at 28 to 32 °C.

DMR reports it is most popular in the coastal states: Odisha, Andhra Pradesh, Tamil Nadu, Kerala and West Bengal. On the north Indian plains the natural window is July to September, the humid monsoon months. In the hills it needs artificial heat and is rarely worth the cost.

02Why rice straw suits it

Every substrate, the material a mushroom feeds on, has a carbon to nitrogen ratio, written C:N. Straw is mostly carbon; nitrogen is the scarce part. DMR states that this mushroom needs a C:N ratio of 40 to 60, far higher than other cultivated mushrooms. In plain words, it is happy on poor, woody material that button mushroom could not use without weeks of composting.

That is why plain paddy straw, soaked and drained, is enough. Indoor growers use cotton waste, which DMR calls the preferred material for that method. Either way the wet substrate should hold 60 to 65 percent moisture: squeezed hard, it should not drip.

03The four to five week clock

DMR calls it a fast-growing mushroom: under favourable conditions the total crop cycle finishes in 4 to 5 weeks. First harvest comes 9 to 10 days after spawning, the day you mix spawn into the bed. Spawn is the grain or straw carrier that holds live mycelium; think of it as the seed, though it is not a seed.

The first flush, the first wave of mushrooms, lasts about 3 days and gives 70 to 90 percent of the whole crop. The second flush, a week or so later, adds only 10 to 30 percent. So the calendar is short and lopsided. Labour, packing and buyers must all be ready for three heavy days.

04The rules that make or break sales

Three rules follow from the biology. First, harvest at the button or egg stage, before the volva breaks. The volva is the skin that wraps the young mushroom like an egg shell. Once it tears and the cap opens, the mushroom turns fibrous and the price drops.

Second, this mushroom cannot go into a fridge. At 4 °C it undergoes autolysis, meaning its own enzymes digest it into a wet mess. DMR gives 10 to 15 °C for about 3 days, and says most is sold on the day of harvest.

Third, yield evidence is thin. The only Indian figure in our fact base is TNAU's 1 to 2 kg per 10 kg straw. One source. Measure your own beds.