The phosphorus nutrition of the apple tree, 3. Influence of phosphate timing treatments on the performance of Jonathan - MM104 apple trees in two years
1990
Taylor, B.K. | Nichols, D.G. (Victorian Dept. of Agriculture and Rural Affairs, Knoxfield (Australia). Gippsland Horticultural Centre)
Young apple trees in perlite culture were treated with added phosphorus in spring, summer, autumn, or in the second growing season. Spring P increased top growth, top-root ratio, P uptake and flowering in the second year; summer P increased the other measures, but not flowering in the second year; autumn P increased P uptake but not growth in the first year. Responses were greater in trees treated following a low-P treatment. All applications raised P content in tree parts including leaves and fruit. Practical implications of the findings are discussed.
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