Abstract
Path-coefficient analysis based on an ontogenetic model was used to study the relationships between tuber yield and yield components as influenced by cultivar and nitrogen fertilization. Four experiments were carried out from 1987 to 1989 in Granada, southern Spain. Two of these experiments used six potato cultivars with a single N rate, while the other two experiments used one cultivar and nine levels of N, split between planting and top-dressing. Variation in tuber yield between cultivars resulted mainly from differences in stem number per m2 followed by tubers per stem and, to a lesser extent, average tuber weight. In N experiments, however, average tuber weight was the only yield component that showed a significant direct effect on yield, while the number of stems per m2 and tubers per stem had negligible direct effects. In addition, the ontogenetic model used indicated compensatory mechanisms during the formation of the three yield components in the potato, which resulted stronger in the N experiments.
Compendio
Para estudiar las relaciones entre la producción de tubérculos y los componentes del rendimiento en función de la variedad y fertilización nitrogenada en el cultivo de patata, se ha realizadado un análisis mediante coeficientes de sendero (path-coefficient analysis) basado en un diagrama ontogénico. Se han llevado a cabo para ello cuatro experimentos entre 1987 y 1989 en Granada, Sur de España. Dos de ellos con seis variedades, y otros dos con nueve dosis de N total, repartido entre fondo y cobertera. Las variaciones en la producción de tubérculos debidas a la variedad han dependido principalmente del número de tallos por m2, del número de tubérculos por tallo y en menor proporción del peso medio de los tubérculos. Sin embargo, en los experimentos de aplicación de N, el peso medio por tubérculo fue el único componente del rendimiento que mostró un efecto directo significativo sobre la producción final, mientras que el número de tallos por m2 y el número de tubérculos por tallo sólo ejercieron efectos directes insignificantes. El diagrama ontogénico utilizado reveló también la existencia de mecanismos de compensación durante la formación de los tres componentes del rendimiento en la patata, que resultaron más pronunciados en los experimentos de N
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This research was supported by INIA 8001
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De la Morena, I., Guillén, A. & del Moral, L.F.G. Yield development in potatoes as influenced by cultivar and the timing and level of nitrogen fertilization. American Potato Journal 71, 165–173 (1994). https://doi.org/10.1007/BF02849051
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DOI: https://doi.org/10.1007/BF02849051