Abstract
A simple potato growth model was validated in 1985 and 1986 at two dryland sites, Grand Forks, ND and Rosemount, MN, and one irrigated site, Hancock, WI. At each site, Russet Burbank potatoes were grown to maximize yield. Leaf area index and leaf, stem, root, and tuber biomass data were collected from replicated experiments every two weeks. Soil matric potentials, minimum and maximum temperatures, and solar radiation also were measured. Among sites, crop development rates and solar radiation receipts were similar, but final tuber yields differed by as much as 35 Mg/ha. Model predictions of leaf, stem, and tuber dry weights were similar to observed data both in terms of maximum values attained and seasonal development except for the experiment in Grand Forks in 1986 where the model over-estimated final tuber yield by 23 Mg/ha (115%). Soil aeration or salinity, factors not currently modeled, may account for this discrepancy. Modeled yield responses to defoliation were compared with field data from one of the experimental locations. At levels of defoliation below fifty percent, proportional yield reductions were similar between observed and modeled crops.
Compendio
En 1985 y 1986, se validó un modelo simple de crecimiento de la papa en dos localidades de tierras sin riego, Grand Forks, ND, y Rosemount, MN, y una localidad irrigada, Hancock, WI. En cada localidad se sembró papa del cultivar Russet Burbank, para maximizar el rendimiento. Cada dos semanas, se recolectó de experimentos repetidos, información sobre el indice de área de hoja, y sobre la biomasa de hoja, talle y raíz. Se midieron también los potenciales considerados de suelo, las temperaturas mínima y máxima, y la radiación solar. Las tasas de desarrollo del cultivo entre las localidades y las radiaciones solares interceptadas fueron similares, pero los rendimientos finales en tubérculos difirieron hasta en 35 Mg/ha. Con la excepción de un experimento, los pronósticos del modelo para los pesos secos de hojas, tallos, y tubérculos fueron similares a los datos observados, tanto en términos de valores máximos logrados como en lo concerniente al desarrollo estacional. Sin embargo, para Grand Forks, en 1986, el modelo sobre estimó el rendimiento final en tubérculos en aproximadamente 23 Mg/ha (115%). La aereación del suelo o su salinidad —factores no considerados en el modelo—pueden ser la causa de esta diferencia. Las respuestas de los rendimientos a la defoliación fueron comparadas con los datos de campo de una de las localidades experimentales. Una concordancia razonable fue observada entre los rendimientos de campo y los pronosticados bajo niveles similares de defoliación.
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This is paper 15,452 of the Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul, MN 55108.
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Johnson, K.B., Conlon, R.L., Adams, S.S. et al. Validation of a simple potato growth model in the North Central United States. American Potato Journal 65, 27–44 (1988). https://doi.org/10.1007/BF02855312
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DOI: https://doi.org/10.1007/BF02855312