"Greenhouse Vegetables" farmland PPT courseware

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"Greenhouse Vegetables" farmland PPT courseware

Write down the names of the common greenhouse vegetables in winter. In what season do most of these vegetables grow normally in their natural state?

Tomatoes, cabbage, lettuce, spinach,

spring

Cucumber, eggplant, pepper, leek, macaroni, loofah, beans, pepper

summer

Lettuce, pumpkin, celery, coriander,

autumn

Cabbage, cabbage, kale, cauliflower, watercress, watercress

winter

Compare the conditions necessary for plant growth and analyze the secrets of growing off-season vegetables in greenhouses.

1. Plant growth requires suitable temperature, sunlight, air and soil.

2. The temperature in the greenhouse is higher than the outside, the humidity is higher than the outside, and the carbon dioxide concentration in the greenhouse is high.

3. The temperature and humidity in the greenhouse are high, which is suitable for the growth of temperature-loving crops.

Compared with vegetables grown in natural conditions, what are the advantages and disadvantages of greenhouse vegetables?

Although greenhouse vegetables are available all year round, especially in winter, they can enrich our dining tables. However, because the crops in greenhouses are not exposed to enough sunlight, their taste is bland and not as delicious as crops that grow normally. Their vitamin content is low and their nutrition is not as good. Crops grown in their natural state.

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"Greenhouse Vegetables" Farmland PPT Courseware 3:

"Greenhouse Vegetables" Farmland PPT Courseware 3 Greenhouse planting is mostly in winter. Guess: Why can off-season vegetables grow in greenhouses? Is it related to temperature? Something to do with humidity? Something to do with the sun? Something to do with the creatures in the greenhouse? ... ... ... Inspecting the growth in the greenhouse..

"Greenhouse Vegetables" Farmland PPT Courseware 2:

"Greenhouse Vegetables" Farmland PPT Courseware 2 Characteristics of Plastic Greenhouses Plastic greenhouses can be used to keep warm in spring and autumn to make vegetables go on the market earlier or delay their delisting. In spring, it can be earlier by 30 to 50 days, and in autumn, it can be delayed by 20 to 25 days. In summer, you can avoid direct sunlight, cool down, increase humidity, and reduce...

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Update Time: 2024-11-25

This template belongs to science courseware E-education edition fifth grade science volume 1 industry PPT template

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