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The heat is to be expected. Fresh air is helpful, but too much can invite contamination. Heat can be created as the hay begins to compost. This is one of the downsides to using hay instead of compost, but it probably won't cause any real problems. The smell is quite normal. You only need to worry if it starts to smell rancid or sickly sweet. It should smell like wet grass and fresh mushrooms. Contamination smell is pretty hard to mistake. You could tell your friend to case his cakes with a 50/50 mix of sterilized peat moss and vermiculite. This can really breathe new life into nearly spent cakes. Your friend can expect 2-3 more flushes if he cases.
------------------ When the going gets weird, the weird get wired.
Thanks, Space...I'll pass on the advice. Should i tell him to clean off the cakes before casing..I mean scrape off old pins and assorted lumps and bumps? kg
Actually, he should crumble his cakes into grape-sized pieces or slice them like loaves of bread. There is no real need to scrape it off. Once the cake is crumbled, he might want to cover it with plastic and wait for it to recover for 24 hours before casing, but this is not strictly necessary. The crumbled cake should spring back to life in the warm humid environment created by the casing layer. He should give it about 3-4 days and then start misting the casing layer lightly 1-2 times daily. When the mycelium starts peeking through in the valleys, he should patch over these spots with moist casing mix to encourage the mycelium to colonize the casing more evenly. Once the mycelium is coming up fairly evenly in all the valleys across the casing layer, he should stop watering, cold shock the substrate, increase the fresh air exchanges, and introduce a 12 on - 12 off light cycle.
Hope this helps.
------------------ When the going gets weird, the weird get wired.