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Filtering by: Decade 1920-1929 Degree Field Soils Rights Statement No Copyright - United States

The relation of calcium ion requirement of alfalfa to the calcium content of the soil

The crop producing power of limited quantities of essential plant nutrient

Studies of economic rates, forms, and combinations of use of sulfur as a fertilizer

Some properties of soil colloids

Removal of plant nutrients in percolate from lysimeter tanks

Improvement in percolation of water thru soils having a high clay content and restrict...