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The concentrations of calcium (Ca) in both tuber skin (periderm) and medullar tissue of potatoes (cv. Rua) grown at Pukekohe on a clay loam were increased by applications of calcium fertiliser before tillage, at planting and as side dressings. Tubers from plots that received a pre-tillage broadcast application of 5 tonnes/ha gypsum (CaSO4) had higher calcium levels than tubers that received 500 g/ha gypsum applied as a band at planting and/or a side-dressing of 645 kg/ha Ca(NO3)2 at tuberisation. Tubers that were given no calcium fertiliser had the lowest concentrations of calcium in the skin (640 ppm) and medullar tissue (266 ppm), whereas the highest skin calcium concentration (1083 ppm) was achieved by application of calcium at pretillage plus at planting. The highest medullar calcium concentration (334 ppm) was achieved by applying calcium on all three occasions. When tubers were inoculated with Erwinia carotovora subsp. atroseptica (Eca) and incubated for 6 days at 20C in moist chambers, tubers from plots that were not supplied with calcium had more rot (16.6 g) than tubers from plots that had calcium applied pre-tillage and at tuberisation (9.2 and 9.3 g rot). The relationship between the amount of soft rot and tuber skin calcium was not linear. The addition of calcium did not affect total yield or grade of tubers.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Calcium fertilisation reduces incidence of soft rot (<i>Erwinia carotovora</i>) on potato tubers