The Availability of High-Temperature Process Alkali (Rhenania-Type) Phosphates to Crops When Applied to Calcareous Soils
1953
Schmehl, W. R. | Brenes, E. J.
Four field experiments were conducted on two soil types to test the effectiveness of high-temperature alkali (Rhenania-type) phosphate fertilizers on calcareous soil. The results showed that Rhenania-type phosphate and concentrated superphosphate had about the same fertilizer value for crops grown on phosphate-deficient soils when the fertilizer was plowed under or broadcast, but there were indications that Rhenania-type phosphate was less effective than superphosphate when the fertilizer was side-dressed. Laboratory studies using various procedures for the determination of available soil phosphorus showed that Rhenania phosphate and concentrated superphosphate were equally effective in increasing the available phosphorus in the soil. The results indicate that the Rhenania-type phosphates offer promise as substitutes for superphosphate under many cropping conditions.
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