Con el objeto de conocer el comportamiento de tres cultivares de frijol ejotero, bajo un clima de transición templado a seco y durante el ciclo de cultivo invierno-primavera, se sembraron los genotipos Strike, Valentino y Saporo de crecimiento determinado en Tepanco de López, Puebla a una densidad de 12.5 plantas m-2, con una fertilización de 150-90-60 de NPK. Para conocer la relación cultivo-ambiente, se realizó el estudio del comportamiento ecofisiológico de los genotipos, bajo un diseño de bloques al azar. Los tratamientos fueron los cultivares de frijol ejotero y las variables de respuesta: el número de vainas, rendimiento, color y forma de la vaina, unidades de calor y evapotranspiración. Para tener un mejor control del experimento, se monitorearon las normales climatológicas, temperatura máxima, mínima y precipitación durante el ciclo de cultivo, con ayuda de una estación meteorológica automatizada. Los resultados indican que la evapotranspiración máxima fue de 166.54 mm alcanzando los tres cultivares la madurez comercial a los 1,192 °C día-1. El mayor rendimiento de ejote, correspondió al cultivar Strike, por ser el mejor adaptado a las condiciones ecológicas del clima de transición. De este estudio se concluye, que Strike es un genotipo recomendable a los productores de la zona de estudio.
The wave effect and the shyness phenomenon in Alnus acuminata (Kunth) are crown parameters rarely studied, but important in the quality of the wood of standing trees, therefore, a morphometric modeling of the crowns of Alnus acuminata in homogeneous forests in the Sierra Norte de Puebla was carried out. In 20 rectangular sites of 1,000 m2, the following were evaluated: total height (TA), normal diameter (ND), crown diameter (CD) and crown cover (CC). The Kruskal Wallis test was applied to data that did not meet the assumption of normality; for those that did, analysis of variance (ANOVA) was used, with Tukey mean comparison tests (α ≤ 0.05). The forest value index was 14.99, so its two-dimensional structure is normal based on DN, AT and CC. Its average slenderness index was 93.52, which makes the tree not very stable to mechanical damage. The life-space index was 38.92, which is high indicating that trees with low intraspecific competition developed better. At the canopy level, a pattern following an upward, oscillatory and constant wave effect was observed in groups of 10 trees. The shyness phenomenon showed an average crack opening of 27.39 cm between canopies, so this phenomenon is well defined for the species. It is concluded that in the crowns of Alnus acuminata, the wave effect is observed as a consequence of inequality in the acquisition of resources, and one way to minimize this inequality is through the phenomenon of botanical shyness.
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