Articles
PHOSPHORUS RESEARCH ON POTATO IN PEI
Article number
619_49
Pages
409 – 417
Language
English
Abstract
Producers in Prince Edward Island (PEI) have typically applied phosphorus (P) fertilizer at 80 to 115 kg ha-1 of P and have built soil levels to where 63% of grower samples tested over 108 µg g-1 by Mehlich III extraction in 1999. Many producers maintain soil pH below 5.8, which may reduce P availability.
The current work examined the effect of diammonium phosphate (DAP) and monoammonium phosphate (MAP) at three rates, with lime-adjusted pH, on P and Ca uptake, yield, and processing quality of potato (cv. Shepody and cv. Russet Burbank). Work was conducted from 1998-2000 at sites which tested over 200 µg g-1 for P (H+) and pH of 5.7-5.9. Five P treatments ranging from 0 to 109 kg ha-1 of P with two levels of lime (nil and 2 t ha-1) were examined with six replications.
Lime had no significant effect on soil P levels in the autumn sampling or on petiole P content at four samplings.
Petiole P was higher at the first two samplings and there were differences between rates of application.
By the third sampling, petiole P content had declined, with only small differences found between P application rates.
Although petiole P content patterns were similar at each time of sampling, Shepody maintained a higher petiole P content in comparison to Russet Burbank at all rates of applied P. Optimum Shepody yields were obtained with 34 kg ha-1 of applied P; higher rates were required for Russet Burbank. There was no consistent difference between the MAP and DAP sources of P. Rate of applied P did not influence specific gravity or processing quality of either cultivar.
Based on these and other results, P recommendations are now lower for Shepody than Russet Burbank.
The current work examined the effect of diammonium phosphate (DAP) and monoammonium phosphate (MAP) at three rates, with lime-adjusted pH, on P and Ca uptake, yield, and processing quality of potato (cv. Shepody and cv. Russet Burbank). Work was conducted from 1998-2000 at sites which tested over 200 µg g-1 for P (H+) and pH of 5.7-5.9. Five P treatments ranging from 0 to 109 kg ha-1 of P with two levels of lime (nil and 2 t ha-1) were examined with six replications.
Lime had no significant effect on soil P levels in the autumn sampling or on petiole P content at four samplings.
Petiole P was higher at the first two samplings and there were differences between rates of application.
By the third sampling, petiole P content had declined, with only small differences found between P application rates.
Although petiole P content patterns were similar at each time of sampling, Shepody maintained a higher petiole P content in comparison to Russet Burbank at all rates of applied P. Optimum Shepody yields were obtained with 34 kg ha-1 of applied P; higher rates were required for Russet Burbank. There was no consistent difference between the MAP and DAP sources of P. Rate of applied P did not influence specific gravity or processing quality of either cultivar.
Based on these and other results, P recommendations are now lower for Shepody than Russet Burbank.
Authors
J.B. Sanderson, J.A. MacLeod, B. Douglas, R. Coffin, T. Bruulsema
Keywords
Solanum tuberosum; lime, soil pH, petiole P content, diammonium phosphate (DAP), monoammonium phosphate (MAP), Ca uptake
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