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Earthworms can never be too numerous nor their value overstated. Sulphates, sulphur, putrefaction, and all other conditions inimical to earthworms are also unfavourable to soil bacteria and fungi. Earthworms are our greatest natural cultivators. Darwin found that worms frequently deposit casts exceeding ten tons in weight on each acre each year when soil is well fed. These casts contain five times more nitrogen, seven times more available phosphorus, eleven times more potash, and forty per cent more humus than are present in the surface layers of that soil. These contents are all in organic form and readily used by plants.
It may be thought that in a well-cultivated garden we have no need for these
lowly creatures, but we cannot afford to dispense with any of the workers Nature
has provided for us. They help us far more than we can ever realize.
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