ISHS Acta Horticulturae 363: III International Symposium on Replant Problems
RESPONSE OF PEACH SEEDLINGS TO RATE AND FREQUENCY OF SOLUBLE PHOSPHORUS APPLICATION AND NITROGEN SOURCE |
| Authors: | D. Neilsen, Eugene J. Hogue, P. Parchomchuk, Gerald H. Neilsen |
| Abstract:
‘Siberian-C’ peach seedlings [Prunus persica (L) Batsch] were grown for 12 weeks in a greenhouse with three levels of P [0, 66, 132 mg.kg-1] applied as H3PO4 (green acid 0-68-0) at three application frequencies [single, weekly, daily doses] and with two N sources [NH4NO3 and Ca(NO3)2]. Shoot and root dry matter production increased in response to P (66 mg.kg-1) but there was no further response from the addition of more P (132 mg.kg-1). Branching increased with added P, but differences in branching were not solely attributable to differences in vigour. Shoot dry weight was reduced by a single application of 132 mg P.kg-1 which was the only effect of application frequency found on plant growth. Nitrogen source did not affect plant growth. Small but significant decreases in soil pH occurred in response to added P and NH4NO3. Soil solution P concentrations (ortho-phosphate) after 12 weeks varied directly with P rate and remained high enough throughout the experiment for a considerable amount of P to have been supplied to the plant by mass flow. | |
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