“Efecto de la aplicación de torta de piñón (Jatropha curcas L.) en diferentes dosis sobre el desarrollo y producción de fréjol caupí (Vigna unguiculata L. Walp.)”

Abstract

Cowpea is of economic and nutritional importance. It is generally managed by chemical fertilization; however, its intensive use leads to environmental and health problems and higher production costs. On the other hand, there are fertilizers of organic origin, such as physic nut seed cake, which contribute to the growth and development of the crop, allowing for sustainable agriculture. This research was carried out at the experimental campus La Teodomira of the Technical University of Manabi. The objective was to evaluate the effect of pine nut cake in different doses on the development and production of cowpea bean. A Completely Randomized Block Design (CSBD) was used, and the following treatments were studied based on the phosphorus content present in the pine nut cake (0.5% P): T1 (0 kg P/ha), T2 (20 kg P/ha), T3 (50 kg P/ha), T4 (100 kg P/ha), T5 (chemical fertilizer ¨Yaramila complex¨); T1 (0 g/plant tort. Jatropha), T2 (27.22 g/plant tort. Jatropha), T3 (68.06 g/plant tort. Jatropha), T4(136.12 g/plant tort. Jatropha), T5(1.88 g/plant tort. Jatropha). The variables studied were plant height (cm), stem diameter (cm), number of leaves, leaf area, leaf dry matter, number of nodules, root volume, pod length, pod width, number of pods per plant, weight of dry pods, seeds per pod, weight of 100 seeds, yield, relative SPAD chlorophyll content, percentage of leaf N, P and K, leaf chlorophyll index (SPAD). In the agronomic variables and In the agronomic variables and in the productive behavior of cowpea in response to the application of pine nut cake at different doses, the best responses were obtained in the treatment with 20 kg P ha-1.