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دانلود رایگان کتاب Green Manuring – Principles and Practice

دانلود رایگان کتاب Green Manuring – Principles and Practice

GREEN manuring has been an agricultural practice among European
farmers for more than two thousand years, but not until the nineteenth
century did students of agriculture become interested in the processes by
which plant material turned under became available for subsequent crops.
Most of our scientific knowledge of plant nutrition, of the microörganisms
of the soil, and of their importance in soil fertility has accumulated during
the nineteenth and twentieth centuries. It was during the nineteenth
century, too, that the tremendous expansion of world food supplies took
place, so that the available food of the world increased more rapidly than
the population, and seemed to many to prove the fallacy of the Malthusian
doctrine.

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