"Understanding Soil" PPT Courseware 3

Description

"Understanding Soil" PPT Courseware 3

Experimental phenomena

Clay soil can be rolled into strips.

Experiment summary

Poor soil viscosity means larger voids, making it looser and easier for water to flow out. It has good aeration performance but poor fertilizer retention performance. The soil is very sticky, which means the voids are small and the water retention performance is good, but the aeration performance is poor.

Which soil do you think is more suitable for growing plants?

Which type is better for plant growth? The aeration and water retention properties of the soil must be considered comprehensively.

Design an experiment to illustrate my point

Loam soil is suitable for the growth of most plants. The solid part of this soil (mineral particles and humus) accounts for 50% of the total volume of the soil, of which organic matter accounts for 1%-5% of the solid part; water and air each account for 25%. %. This not only provides ventilation and water permeability, but also retains water and fertilizer, which can provide sufficient water, air and organic matter for the growth of plants.

Summarize

1. Characteristics of three soils

2. Proportions of components of loam soil

3. The most suitable soil and reasons for plant growth

Find the composition of soil

Method What I saw in the soil

To the naked eye, the soil is moist, with small pebbles, grass roots and small insects.

Magnifying glass contains pebbles, sand grains of different sizes, and powdery particles

Pour into the water, bubbles will appear, and the soil will settle according to the size of the particles. The farther to the bottom, the coarser the particles.

Experimental steps:

1. Put small clods of soil into water. What do you see? Explain what is in the soil?

2. Stir the soil and let it sit for a while. While waiting, place part of the soil on a petri dish, cover it with an asbestos net, and burn it with an alcohol lamp. What smell can you smell? Explain what is in the soil?

3. Observe the situation in the water glass after it has stood. What is in the water?

Precautions:

1. Earth clods should be handled with care.

2. Stir thoroughly.

3. Let it sit for a long time. The cup should also remain still while observing.

4. Always observe carefully and record what you see at every step. Read this and get started.

Keywords: Understanding soil teaching courseware, download the science PPT courseware for the second volume of the fourth grade in the E-education edition, download the science slide courseware for the fourth grade, download the PPT courseware for understanding the soil, .PPT format;

For more information about the "Understanding Soil" PPT courseware, please click the "Understanding Soil ppt" tab.

"Understanding Soil" PPT Courseware 2:

"Understanding Soil" PPT Courseware 2 Soil can be seen everywhere in our daily life. Please talk about your understanding of soil based on your own life experience 1. How soil is formed 2. What are the common types of soil 3. Soil What's in it 4. What's in the soil...

"Understanding Soil" PPT courseware:

"Understanding Soil" PPT courseware Learning objectives 1. Know what types of soil are there? 2. Do you know what the composition of soil is? 3. Do you know how to protect the soil? Experiment 1: Is there air in the soil? Experiment 2: Put a piece of soil into a test tube and burn it. What will happen? ..

File Info

Update Time: 2024-11-09

This template belongs to science courseware Fourth-grade science volume 2 of the E-education edition industry PPT template

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