Correctly uncovering the grass thatch is extremely important for the production of vegetables in the greenhouse in winter. Here, we remind vegetable farmers that uncovering the grass thatch should be scientific.
Revealing the grass thatch in the morning: Many vegetable farmers believe that the sun shines on the greenhouse and then the thatch is opened. However, most vegetable farmers can't answer to the extent of the exposure.
Uncovering the grass thatch in the morning cannot be based on your feelings. The temperature in the shed should be used to judge whether the time of uncovering the grass thatch is appropriate. The method is: the temperature in the shed will decrease when the grass thatch is uncovered, but the decrease should not exceed 1 ℃. It's early; the temperature in the shed has not dropped when the grass thatch is uncovered, indicating that the grass thatch is uncovered late.
Covering grass thatch in the afternoon: At present, vegetable farmers cover grass thatch in the afternoon. Some are covering the thatch after the sun sets, and some are covering the thatch at 3:30 to 4 in the afternoon. In fact, these are not scientific. It should be determined according to the temperature in the shed. Thatch time. The method is: when the temperature in the shed reaches 17 ℃ ~ 18 ℃, start to cover the grass thatch, the temperature in the shed may rise after the thatch is covered, and the temperature should not exceed 1 ℃.
Uncovering the grass thatch for a long time: After a long period of low temperature, rain and snow, and a cloudy day, it suddenly becomes sunny. Do not uncover all the grass thatch to prevent "flashing". The flower thatch should be uncovered in the first 3 days (one or two every other), and the area to be uncovered gradually increases. After two days, it will be fully uncovered (the roller shutter shack can open a section first, and then gradually increase).
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