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Availability of Phosphorus to Sugar Cane in Hawaii as Influenced by Various Phosphorus Fertilizers and Methods of Application*

Published online by Cambridge University Press:  03 October 2008

S. K. de Datta
Affiliation:
Department of Agronomy and Soil Science, University of Hawaii, Honolulu, Hawaii
J. C. Moomaw
Affiliation:
Department of Agronomy and Soil Science, University of Hawaii, Honolulu, Hawaii

Summary

An experiment was carried out in the glasshouse to determine the availability of P, and utilization of added phosphate fertilizers from three fertilizer materials, applied by two different methods to sugar cane grown in four diverse soil systems. Phosphorus was applied at the equivalent rate of 175 pounds P (400 pounds P2O5) per acre. A larger response from added P in terms of plant yields was obtained from an aluminous ferruginous latosol and least from dark magnesium clay. Differences in yields of sugar cane were evidently associated with differences in P content in the cane plants and, in certain cases, with a reduction in Al content in plant tops, and the less soluble superphosphate increased yields more than the highly soluble NH4H2PO4. Phosphate fertilizers applied as foliar spray greatly increased the P content in the plants, and plants contained twenty times more P when sprayed with NH4H2PO4 than when the same fertilizer was applied to the soil. However, increased P content in the plants did not necessarily indicate that the P was translocated within the plants or that the added P participated in metabolic processes. The evidence indicated that in soils where the ‘A’ value was high the P status of the sugar cane tops was not correspondingly high.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1965

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References

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