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Experiments comparing concentrated and dilute NPK fertilizers and four nitrogen fertilizers on a range of crops

  • F. V. Widdowson (a1), A. Penny (a1) and R. J. B. Williams (a1)

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1. In 1959 a concentrated granular fertilizer (15% N, 10% P2O5, 20% K2O) was compared with an equivalent mixture of ammonium sulphate, superphosphate and muriate of potash (each supplying 0·75 or 1·50 cwt. N/acre) for potatoes. At Rothamsted (on heavy soil) the two fertilizers gave similar yields, but at Woburn (on light soil) the larger dressing of the concentrated fertilizer gave about 1 ton/acre more potatoes. In similar barley experiments a concentrated granular fertilizer (20% N, 10% P2O5, 10% K2O) was compared with a dilute granular fertilizer (12% N, 6% P2O5, 6% K2O); each was combine-drilled to supply 0·3 or 0·6 cwt. N/acre. At Rothamsted the two fertilizers gave identical yields, but at Woburn the concentrated fertilizer (at the double rate) gave significantly more grain.

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References

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Chalmers, G. R. & Kemp, D. C. (1962). J. Agric. Eng. Res. 7, no. 1, 64.
Cooke, G. W. (1964). Proc. Fertil. Soc. no. 80.
Cooke, G. W. (1964). J. Roy. Agric. Soc. 125, 142.
Devine, J. R. & Holmes, M. R. J. (1963a). J. Agric. Sci. 61, 381.
Devine, J. R. & Holmes, M. R. J. (1963b). J. Agric. Sci. 61, 391.
Frederick, L. R., Brown, J. R. & Bartholomew, W. V. (1963). Crops and Soils, 1112, no. 21.
Gasser, J. K. R. (1959). J. Sci. Fd Agric. 10, 192.
Shell Chemical Co. (1964). Fertilizers, the Facts and Figures on High Concentration.
Widdowson, F. V., Penny, A. & Williams, R. J. B. (1964). J. Agric. Sci. 62, 73.

Experiments comparing concentrated and dilute NPK fertilizers and four nitrogen fertilizers on a range of crops

  • F. V. Widdowson (a1), A. Penny (a1) and R. J. B. Williams (a1)

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