Summary
The average yield of marketable potatoes was increased significantly in organic soil by increasing the application rate of N from 55 pounds per acre to 110 pounds, but the specific gravity of the tubers was decreased. Method of nitrogen placement did not affect yields significantly. Urea used as a foliar spray was not effective in increasing yields.
The nitrate release rate, as measured by growth chamber and laboratory incubation tests, was lower for an organic soil which had shown a high nitrogen requirement in the field tests than for one showing a low nitrogen requirement. Potatoes in a newly-cultivated organic soil required no more than 55 pounds of N per acre but in a soil under cultivation for ten years they responded to a higher nitrogen level.
Resumen
El rendimiento promedio de papas vendibles fué incrementado significativamente en el suelo orgánico por el incremento de nitrógeno de 55 a 110 libras por acre pero la gravedad especifica de los tubérculos disminuyó. La colocación del nitrógeno no influyó significativamente el rendimiento. La aspersión de urea sobre las hojas de las papas no incrementó el rendimiento.
El rato de la formación de nitrato, medido por medio del crecimiento de plantas y la incubación en el laboratorio, fué menos por un suelo orgánico requeriendo mucho nitrógeno en el campo que por uno requeriendo menos del nitrógeno. Las papas en un suelo orgánico neuvo cultivado requerieron no más que 55 libras de nitrógeno por acre pero en un suelo de diez años de cultivo respondieron a un nivel de nitrógeno más alto.
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Literature Cited
Cooke, G. W. and R. K. Cunningham. 1958. Mineralizable nitrogen determined by an incubation technique. J. Sci. Food Agric. 9: 324–330.
Eagle, D. J. and B. C. Matthews. 1958. Measurement of nitrate-supplying power of soils by an incubation method and correlation with crop yield response. Can. J. Soil Sci. 38: 161–170.
Harmsen, G. W. and D. J. Lindenbergh. 1949. Investigations on the nitrogen nutrition of plants. Plant and Soil 2: 1–29.
Maas, E. F. 1963. The effect of seed spacing and nitrogen levels on the size of Netted Gem potatoes. Amer. Potato J. 40: 133–136.
Additional information
Contribution No. 221. Research Station, Canada Department of Agriculture, Saanichton, British Columbia. Accepted for publication.
An erratum to this article is available at http://dx.doi.org/10.1007/BF02863031.
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Maas, E.F. Nitrogen deficiency of potatoes in organic soil. American Potato Journal 45, 378–382 (1968). https://doi.org/10.1007/BF02849716
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DOI: https://doi.org/10.1007/BF02849716