Author: Hopkins Bryan Ellsworth Jason Shiffler Amanda Bowen Thomas Cook Aaron
Publisher: Taylor & Francis Ltd
ISSN: 0190-4167
Source: Journal of Plant Nutrition, Vol.33, Iss.7, 2010-01, pp. : 1026-1039
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Abstract
Potato (Solanum tuberosum L.) has active surface roots that may enable phosphorus (P) fertigation. Fertilizer trials were conducted in 2002-2004 with 0 or 224 kg P2O5 ha-1 applied as incorporated pre-plant broadcast, in-season fertigation, or split application (half pre-plant and half in-season). All of the P fertilization treatments increased petiole P concentration over the untreated control in all three years of the trial, but only the pre-plant application resulted in significant increases in US No. 1 and Total yields. Both the pre-plant and the split application resulted in significant increases in Marketable yield (US No. 1 & 2). These results show that P fertilizer should be applied and incorporated prior to planting. Fertigated P does enter into the plant, but the relative efficiency of this method of application for P is poor with regard to important yield and quality parameters and application as such should be limited to “rescue” situations.
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