Controlled Release of Magnesium, Zinc, Boron and Nitrogen from Polyethylene Capsules

Ashby, D.L.

Canadian Journal of Plant Science 49(5): 555-566


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps69-097
Accession: 068493797

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Perforated polyethylene capsules were studied as a means of controlling the rate of release of Mg, Zn and B fertilizer salts. For ryegrass in the greenhouse, encapsulation generally resulted in more uniform Zn levels and reduced B toxicity, as compared with soil application. N application increased yield tenfold. Encapsulated N was more effective than soil-applied N. Mg in capsules with N reduced yields, but B and/or Zn with N had little effect. Zn and B, and N and Mg were mutually antagonistic in their release from capsules. The rate of release of Mg from capsules incubated in soil columns was relatively constant over 36 weeks. Percent Mg released was generally higher in a silt loam than in a loamy sand. Release of Mg was also greater from capsules with perforations on the upper or both surfaces than from capsules with perforations on the lower surface. Movement of Mg from capsules with perforations on both surfaces was predominantly downward.