Abstract
Field experiments were conducted in Wisconsin for 3 years on irrigated sandy and silt loam soils in an attempt to better calibrate potato phosphorus (P) needs and to determine which of several P fertilizer placements/timings were best for crop yield and quality or could improve P fertilizer use efficiency. In 2 of 3 years at both locations, positive yield and tuber quality responses were seen with phosphate rates ranging from 45 to 200 kg P2O5 ha−1 on the sand and 124 kg > 224 kg P2O5 ha−1 on the silt loam. Row placement improved P fertilizer use efficiency on the sand but not on the silt loam. In-season P applications improved plant P concentrations, but did not always result in tuber yield or quality responses, although this method may be effective as a rescue treatment. Early season (~35 days after emergence, dae) petiole P analysis was useful for predicting P sufficiency with a critical level of 0.35% P. Later sampling (> 50 dae) did not adequately separate responsive from non-responsive treatments. Based on this research, row-placed P at modest rates (about 100 kg P2O5 ha−1) is recommended on sandy soils, whereas on the medium-textured soil all placement/timings performed similarly except the in-season treatment. A higher rate was needed (~160 kg P2O5 ha−1) on this soil to optimize yield and quality.
Resumen
Se condujeron experimentos de campo en Wisconsin por tres años en suelos arenosos y franco limosos, en un intento para calibrar mejor las necesidades de fosforo (P) en papa y para determinar cuál ubicación/calendario de varios fertilizantes fosforados fueron los mejores para el rendimiento y calidad del cultivo o pudiera mejorar la eficiencia en el uso del fertilizante de fosforo. En 2 de los tres años en ambas localidades, las respuestas al rendimiento positivo y la calidad del tubérculo se observaron con una evaluación de los niveles de fosforo variando desde 45 a 200 kg P2O5 ha-1 en la arena, a 124 kg > 224 kg P2O5 ha-1 en el franco limoso. La colocación en el surco mejoró la eficiencia en el uso del fertilizante fosforado en la arena pero no en el franco limoso. Las aplicaciones durante el ciclo mejoraron las concentraciones del P en la planta, pero no siempre resultó en respuestas en rendimiento y calidad de tubérculo, aunque este método pudiera ser efectivo como un tratamiento de rescate. El análisis del P del pecíolo temprano en el ciclo (~35 días después de la emergencia, dae) fue útil para predecir la suficiencia de P con un nivel crítico de 0.35% de P. Un muestreo posterior (>50 dae) no separó adecuadamente los tratamientos que respondieron de los que no respondieron. Con base a esta investigación, la aplicación de P en el surco a niveles modestos (cerca de 100 kg P2O5 ha-1) se recomienda en suelos arenosos, mientras que en suelos de textura media todas las ubicaciones/calendario se comportaron de manera similar, con excepción del tratamiento dentro del ciclo. Se necesitó de un nivel más alto (~160 kg P2O5 ha-1) en este suelo para optimizar el rendimiento y la calidad.
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Acknowledgments
Support for portions of this research was provided by the Wisconsin Potato and Vegetable Growers Association Potato Industry Board, the Wisconsin Fertilizer Research Council, and UW College of Agricultural and Life Sciences, and is gratefully acknowledged.
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Kelling, K.A., Wolkowski, R.P., Speth, P.E. et al. Interaction of Fertilizer Phosphorus Rate and Placement/Timing on Potatoes. Am. J. Potato Res. 97, 420–431 (2020). https://doi.org/10.1007/s12230-020-09784-2
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DOI: https://doi.org/10.1007/s12230-020-09784-2