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In order to characterize the reproductive structure, the production and seed germination of different materials of Tithonia diversifolia Hemsl.) A. Gray, a total of three experiments were performed at different times and five plant materials were evaluated (3, 10, 16, 23, 25). The harvest of ten heads (2018 and 2019) was carried out by means of a random sampling at five points on the diagonal of the field. The evaluated materials constitute the treatments. A completely random design was used for the analysis of the variables diameter (cm) and seed heads weight (g), number and weight (mg) of full and empty seeds and of PGS seed heads-1. To the total number and the germination percentage of seed at different times 3, 5, 7 and 30 days) a simple classification nonparametric analysis of variance was performed. The studied materials showed phenotypic differences in terms of their reproductive structure. The seed heads of material 25 had a higher diameter. Material 16, due to its higher weight, distinguished itself from the rest of the evaluated materials. The waste from the seed heads is approximately 71.18 % of their total weight. The seed production of materials 10, 23 and 25 is very similar with respect to the total number of seeds in the seed heads, as well as the number of empty seeds. However, material 23 showed a lower number of full seeds (P = 0.0005). These results contribute to the knowledge of the reproductive characteristics of each specific material, which will allow the development of future studies related to the gamic seed production strategy. [ABSTRACT FROM AUTHOR]

In an area of the Amazon plain, the effect of the food source on the chemical composition of the Californian red worm (Eisenia foetida) vermicompost was evaluated. The research was carried out at "El mochilo” farm, from Centro Agroforestal y Acuícola “Arapaima”. An analysis of variance was performed, according to a random block design. Three treatments and three replications were established: T1) 100 % fruit and vegetable wastes, T2) 100 % chicken manure wastes and T3) mixture of 30 % bovine manure, 35 % chicken manure and 35 % fruit and vegetable wastes. The variables electrical conductivity, pH, organic matter content, nitrogen, phosphorus, potassium and C/N ratio were measured. Analysis of variance was performed Duncan (1955). The treatments with the highest amount of fruit and vegetable wastes (T1 and T3) obtained higher potassium contents, with values of 1.23 % and 1.20 %, respectively, compared to 100 % chicken manure, which obtained higher phosphorus content, pH value of 7.23 with better vermicomposting stability. The research showed that, according to their chemical composition, the different sources for the elaboration of vermicompost constitute a viable option to obtain a quality product. A higher content of fruits and vegetables achieved more potassium in the final product. On the contrary, higher phosphorus and organic matter contents were recorded from a source that contained chicken manure. [ABSTRACT FROM AUTHOR]