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Effect of Nitrogen, Sodium, and Potassium on Nitrate and Oxalate Concentration in Kikuyugrass

Published online by Cambridge University Press:  12 June 2017

M. Coburn Williams ,
Burton J. Smith  and
Lopez V. Rafael
M. Coburn Williams
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Poisonous Plant Res. Lab., 1150 E. 1400 N., Logan, UT 84321
Burton J. Smith
Affiliation:
Livestock and Pasture Management, Univ. of Hawaii, P.O. Box 237, Kamuela, HI
Lopez V. Rafael
Affiliation:
Haras Cerro Punta, S.A., P.O. Box 1795, Panama 1, Republic of Panama
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Abstract

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Kikuyugrass was analyzed for nitrate (expressed as KNO3) and soluble oxalate concentration after it was grown for 8 wk in nutrient solution supplemented with KCl, NaCl, or NH4NO3; fertilized in the greenhouse with urea and KNO3 at 112 kg N ha-1; and fertilized in the field in Hawaii and Panama with urea at 56 and 112 kg N ha-1. Both treated and untreated kikuyugrass grown in nutrient solution contained toxic levels of nitrates and soluble oxalates. Plants treated with urea in the greenhouse contained 0.4% nitrate (nontoxic) 72 h after treatment whereas those treated with KNO3 contained 2.36% nitrate (highly toxic). Fertilization of kikuyugrass with urea in Panama and Hawaii did not significantly affect soluble oxalate concentration, but nitrate concentration increased to potentially lethal levels (over 1.5% as KNO3, dry wt) in plants from Hawaii.

Keywords

Kikuyugrass, Pennisetum clandestinum Hochst. ex Chiov. ♯ PESCLFertilizerKClKNO3NaClpoisonous planturea
Type
Research
Information
Weed Technology , Volume 5 , Issue 3 , September 1991 , pp. 553 - 556
Copyright
Copyright © 1991 Weed Science Society of America 

References

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