Effect of dolomitic limestone on soils and crops when used as a neutralizing agent in complete fertilizers
1942
Collins, E.R. | Skinner, J.J.
Fertilizers formulated to be non-acid-forming with dolomitic limestone gave significantly highest yields of cotton, sweet potatoes, and Irish potatoes than acid-forming fertilizers on Coastal Plain soils in North Carolina. Neutralizing the fertilizer with dolomitic limestone, maintained soil pH at approximately the original level; increased total magnesium in the plant and the available magnesium in the soil of the root zone; and increased total calcium in the plant with no appreciable change in the ultimate available calcium content of the soil or the potash content of the plant, indicating no appreciable liberation or fixation of the soil and fertilizer potash. Acid-forming fertilizers decreased thc pH of the soils in thc cotton and Irish potato experiments where 600 pounds per acre of a fertilizer having an equivalent acidity of 500 pounds per ton of limestone were used annually on cotton for 4 years, and 2,000 pounds per acre of a fertilizer having an equivalent acidity of 585 pounds of limestone per ton were used annually on potatoes for 3 years. The soil's pH was not decreased where 1,100 pounds per acre of a fertilizer having an equivalent acidity of 250 pounds of limestone per ton were used annually on sweet potatoes for 4 years.
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