Yes, fume smoke can reduce radiation evaporation of soil heat, while smoke particles can absorb moisture, so that water vapor condenses into a liquid to release heat, increase the temperature, reduce or avoid frost orchard. Therefore, the majority of farmers should pay close attention to the local weather forecast, cooling around the orchard around 12 o'clock in the evening to burn leaves, firewood, wheat bran, sawdust, etc., warming and defrosting antifreeze, of which piles of burning sawdust is best. The preparation ratio is: ammonium nitrate 20%~30%, sawdust 50%~60%, waste diesel oil 10%, fine coal powder 10%. Smoke released in this way is rich and lasts for a long time. Also need to pay attention is that smoke should pay attention to choose to face the smoke on the wind.
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