"Which soil is better to plant in" PPT courseware of plant life in the land

Description

"Which soil is better to plant in" PPT courseware of plant life in the land

Teaching introduction

Main habits: perennial, often cultivated as annual or biennial crops

Cultivation conditions: Germination temperature is 18-20°C, suitable for well-drained soil

Think about it: Can you configure the right soil for it using clay and sand?

Knowledge explanation

1. Compare the water permeability of sand and clay

1. Design experiments

Principle: Good drainage means good water permeability

Method: Comparative experiment

2. Do experiments

3. Experimental results

Sand has better water permeability than clay

So sand has better drainage than clay

2. Compare different types of soils

1. According to the difference between clay and sand, soil in nature is divided into:

Clay soil: Contains a lot of clay.

Sandy soil: soil containing a lot of sand.

Loam soil: not much different.

2. Compare the morphology of these three types of soils

① Touch it

Discussion: Why do sandy soil particles have larger particles, clay soil particles have smaller particles, and loam soil particles have intermediate particle sizes?

This has to do with the sand and clay content.

3. Compare water permeability and water retention

Conclusion: Sandy soil seeps water quickly and has poor water retention;

Clay soil has slow water seepage and good water retention;

The water permeability and water retention of loam soil are intermediate.

4. Comparative breathability

Discussion: Is the amount of air in the three types of soil the same?

Which type of soil has more air and which type of soil has less air? Why?

Sandy soil: large particles, large pores, poor water retention, good water permeability, and good air permeability.

Clay soil: small particles, small pores, good water retention, poor water permeability, and poor air permeability.

Loam soil: in the middle.

After-class experiment: After returning home, take some soil around your home to observe and test what type of soil it is.

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For more information about the PPT courseware "What Kind of Soil Is Better to Plant in Land for Plant Life", please click on the ppt label of "What Kind of Soil Is Better to Plant in Land for Plant Life".

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Update Time: 2024-11-24

This template belongs to science courseware People's Education Press third grade science volume 2 industry PPT template

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