English

Renovation of worn-out soils

16 pages ; 23 cm · To build up and maintain fertility in the soil, feed a large part of the crops and return the manure to the land. If manure is not available, plow under crops grown for the purpose. Plow deep (but do not subsoil). Grow leguminous crops for the nitrogen they add to the soil. Commercial fertilizers and lime may be important means of improving the soil, but the fertilizer requirements of different soils and different crops in different seasons are so little understood that we are not yet in a position to make positive recommendations that are of a general application · Cover title · Preliminary remarks -- Differences in natural fertility -- Nature of the soil -- Mineral plant food -- Nitrogen compounds -- Soil moisture and humus -- Soil air -- Substances thrown off in the soil by growing plants -- Effects of tillage -- Effect of plowing soil when too wet or too dry -- Terracing and soil washing -- Improving the soil : Increasing the stock of humus ; Stable manure ; Green manures, crimson clover, vetches, rye, cowpeas, miscellaneous green-manure crops -- Types of farming that build up the soil quickly -- Summary

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