Many plants like good drainage without losing the water in soil too fast. This is especially important for plants that are harvested early. The ideal situation is when the minerals are surrounded by a thin layer of water and there is air between the organic materials. The roots will circle the minerals and they will be able to absorb the necessary nutrients and will be able to breathe.
Layers of Soil
The point of drainage is the removal of water and adding limestone and organic materials will make the clay become lumps and improve drainage. It can also be improved by ventilating or plowing the soil, depending on climate factors. If plowing is done in dry air, the clay will not stick to the machine and soil will easily be seperated to a sand like quality, easing the flow of water. Adding sand or pebbles might also improve the drainage of soil, but this will require a great amount of both. As it is expensive, that method can only be considered for small fields.
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