Paraguay (1) Production (Economic theory) (1) Poultry--Manure (1) Matter (1) Leaves (1) Humus (1) Fountains (1) Farm manure (1) Design (1) Chance (1) Analysis of variance (1) Estiércol (1) Gallinaza (1) Análisis de varianza (1) Fuentes (1) Hojas (1) Humus (1) Diseño (1) Producción (1) Azar (1) Materia (1) production (1) matière (1) hasard (1)