How to Teach Agriculture

Cover How to Teach Agriculture
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Experiments : 1. To show effect of drainage.
2. To show effect of air in soil.
Section VI. Improving the Soil Virgin soils.
How to reclaim old soils.
What tillage does.
14 HOW TO TEACH AGRICULTURE The value of humus.
How to add humus.
Experiment : To show good and poor preparation of soil.
Section VII. Manuring the Soil The first use of fertilizers in America.
The way to ruin the soil.
The way to build the soil.
The forms of nitrogen in fertilizers.
The forms of phosphorus.
The forms of potassi
...um.
CHAPTER II. THE SOIL AND THE PLANT Section VIII. Roots Do roots branch regularly, as do twigs?
How deep do the roots of corn plants extend into the soil ?
Examine the root hairs of seeds planted in the germinator.
Why does a plant wither when it is cut from its roots?
How does a knowledge of the length of roots affect tillage ?
Examine plants in the field and find which are deep-rooted and which are shallow-rooted.
Section IX. How the Plant feeds from the Soil Food must be in a soluble condition in order to be used by a plant.


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