Processes for producing nitric phosphate offer a means for utilizing low grade phosphate material, called leached-zone ore, that occurs in Florida land-pebble deposits. Because the nitric phosphate produced therefrom carries a much larger amount of aluminum than that made from commercial Florida land pebble, nutritive tests were made in the greenhouse, in order to determine the relative value of the high-alumina nitric phosphate.Crop yields and phosphorus uptakes showed that the leached-zone nitric phosphate had a lower agronomic value than the land-pebble material, when both had a low proportion of phosphorus in the water-soluble form. At medium levels of water solubilities, however, both products and triple superphosphate gave comparable yields.

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Synopsis Gibberellic acid gave significant height responses even after storage up to 16 weeks, both from spray and soil applications.

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