Abstract
The influence of differing degrees of phosphoric acid acidulation of North Carolina phosphate rock on the total P uptake of ryegrass was examined. The fertilisers were applied at three rates, using two granule sizes, to three soils in pots in the glasshouse.
Similar results were obtained in the three soils. Increase in P rate applied increased total P uptakes. Increase in degree of acidulation increased P content of the foliage and the smaller granules also gave slightly higher values in two soils.
Except in one soil, using the smaller granules, there appeared to be no contribution of P for plant growth from the unreacted rock component of the fertilisers.
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Stephen, R. The agronomic value of products resulting from the partial acidulation of North Carolina phosphate rock with phosphoric acid. Fertilizer Research 8, 67–73 (1985). https://doi.org/10.1007/BF01048907
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DOI: https://doi.org/10.1007/BF01048907