Hostname: page-component-8448b6f56d-c4f8m Total loading time: 0 Render date: 2024-04-18T06:59:20.883Z Has data issue: false hasContentIssue false
  • English
  • Français

Evaluation of phosphate fertilizers. III. Immediate and residual values of potassium metaphosphate and magnesium ammonium phosphate for potatoes, radishes, barley and ryegrass

Published online by Cambridge University Press:  27 March 2009

G. E. G. Mattingly ,
A. Penny  and
Marie Blakemore
G. E. G. Mattingly
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
A. Penny
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
Marie Blakemore
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
Get access Rights & Permissions [Opens in a new window]

Summary

Triple superphosphate (21.6% P), potassium metaphosphate (25.0% P) and magnesium ammonium phosphate (19.0% P) were compared as phosphate fertilizers alone and in combination, and as powders and granules, in two experiments on acid soils. Basal nutrients were adjusted to allow for the amounts of N, K, and Mg in the test fertilizers. Immediate effects of the fertilizers were measured by early potatoes and barley, and residual effects by radishes and ryegrass.

All powdered fertilizers, alone or in combination, were equivalent to powdered superphosphate for early potatoes. The value of granular fertilizers for potatoes increased with the proportion of superphosphate in the mixtures. Superphosphate equivalents of the granular fertilizers were: magnesium ammonium phosphate, 14%; potassium metaphosphate + magnesium ammonium phosphate, 36%; potassium metaphosphate, 53%; superphosphate + potassium metaphosphate + magnesium ammonium phosphate, 54%; superphosphate + magnesium ammonium phosphate, 60%; superphosphate + potassium metaphosphate, 81%.

Residues from powdered fertilizers, applied to potatoes, were equivalent, for radishes, to residues from powdered superphosphate. Residues from granular fertilizers were more effective for radishes than residues from powders.

All powdered fertilizers were equivalent to powdered superphosphate for barley cut green. Granular magnesium ammonium phosphate, either alone or mixed with potassium metaphosphate, was slightly less effective than powder.

Residues from all powdered fertilizers applied to barley were equivalent for ryegrass. Residues from granular fertilizers, especially potassium metaphosphate and magnesium ammonium phosphate, produced more grass than residues from powders.

Apparent recoveries of P by the four crops ranged from 24% to 32% and were more from granules than from powders. Residues from all fertilizers increased 0.5M-NaHCO3-soluble P in soils, and mean yields of ryegrass, the final test crop, increased by 3.2 to 5.1 cwt dry matter/acre/ppm NaHCO3-soluble P in the soils.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 76 , Issue 1 , February 1971 , pp. 131 - 141
Copyright
Copyright © Cambridge University Press 1971

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Benzian, B., Bolton, J. & Mattingly, G. E. G. (1969). Soluble and slow-release PK-fertilizers for seedlings and transplants of Picea sitchensis and Picea abies in two English nurseries. PI. Soil 31, 238–50.CrossRefGoogle Scholar
Blakemore, M. & Mattingly, G. E. G. (1964). Valuing phosphate fertilizers in glasshouse experiments. Rep. Eothamsted exp. Stn for 1963, p. 51.Google Scholar
Bridger, G. L., Salutsky, M. L. & Starostka, R. W. (1962). Metal ammonium phosphates as fertilizers. J. arjric. Fd Chem. 10, 181–88.CrossRefGoogle Scholar
Hagin, J. (1966). Evaluation of potassium metaphosphato as fertilizer. Soil Sci. 102, 373–79.CrossRefGoogle Scholar
Hagin, J. & Scherzer, S. (1967). Potassium metaphosphate as a fertilizer. Trans. Meet. Commns II and IV int. Soc. Sci., 1966, pp. 175–85.Google Scholar
Harris, F. J. (1963). Potassium metaphosphate: a novel method of manufacture and a summary of its behaviour as a fertilizer. Proc. Ferlil. Soc. no. 76, pp. 4–36.Google Scholar
Mattingly, G. E. G. (1968). Evaluation of phosphate fertilizers. II. Residual value of nitrophosphates, Gafsa rock phosphate, basic slag and potassium metaphosphate for potatoes, barley and swedes grown in rotation, with special reference to changes in soil phosphorus status. J. agric. Sci. Camb. 70, 139–56.CrossRefGoogle Scholar
Mattingly, G. E. G. & Penny, A. (1968). Evaluation of phosphate fertilizers. I. Immediate value of dicalcium phosphate, nitrophosphates, Gafsa rock phosphate, basic slag and potassium metaphosphato for barley and ryegrass. J. agric. Sci. Camb. 70, 131–38.CrossRefGoogle Scholar
Nakamuba, K., Kurihabi, K. & Mitsui, S. (1965). Pot experiments on the fertilizing efficiency of magnesium ammonium phosphate for crop plants. Soil Sci. Pl. Nutr. 11 (3), 38.Google Scholar
Rothamsted Experimental Station (1965–1968). Numerical results of the field experiments. Rate of action of P fertilizers, 65/C/28; 66/C/20 and 21; 67/C/16 and 17; 68/C/13.Google Scholar
Terman, G. L. & Taylor, A. W. (1965). Crop responses to nitrogen and phosphorus in metal ammonium phosphates. J. agric. Fd Chem. 13, 497–500.CrossRefGoogle Scholar