Section 14
Chapter 13,116

Effect of trace element sprays and fritted trace elements on the growth and manganese, zinc, copper, and boron contents of young Braestar

Wooldridge, J.

Journal of plant nutrition 5(1): 43-59


ISSN/ISBN: 0190-4167
Accession: 013115123

In a 21-month pot trial, year-old Braestar/M793 apple trees were subjected to a combination of foliar sprays containing manganese sulfate, zinc oxide, Solubor, copper oxichloride, and urea at rates, respectively, of 1.0, 0.5, 1.0, 0.25, and 2.5 g L(-1) water, and soil-applied fritted trace elements (FTE). The carrier (FTE-504Fe) contained 7.5% manganese (Mn), 7.0% zinc (Zn), 7.0% copper (Cu), and 3.8% boron (B), and was mixed into the washed sand growing medium, before planting, at rates of 0, 100, and 200 g FTE m(-3). Where FTE was applied at 100 g m(-3) and foliar sprays were also applied, total tree dry mass (DM) and rootstock DM were significantly (p less than or equal to 10.05) greater, by 16% and 29%, respectively, than in the control which received no FTE and no sprays. Sprays without FTE had no effect on DM. Where FTE was applied at 200 g m(-3), with sprays, stem diameters were 17% smaller than at the 100 g FTE m(-3) application rate, implying oversupply. Oversupply of FTE at 200 g m(-3) was marked in the unsprayed treatments where stem diameter and scion, rootstock, and total tree DM were smaller than in the control by, respectively, 16%, 31%, 20%, and 27%.

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