Propagación de Caesalpinia spinosa (Molina) kuntze mediante cuatro tratamientos pre germinativos en tres tipos de sustratos, bajo condiciones de invernadero.

Abstract

The aim of this research was to propagate Caesalpinea spinosa (Molina) Kuntze by means of four pre-germinative treatments in three types of substrates under greenhouse conditions, in the canton of Ambato. This allowed us to improve the reproduction of this forest species of great social and economic importance. A completely randomized block design (DBCA) was applied, with 4 replications and 25 seeds per experimental unit. The factors evaluated were: pre-germinative treatments and substrates, where the substrates were combined: B1: river sand 50% + humus 50%, B2: Commercial Peat, B3: Soil 30% + Sand 40% + humus 30%, with the treatments: A1: Mechanical scarification with sandpaper: scraping of seeds and soaking for 24 hours, A2: Immersion in boiling water: seeds were immersed for 30 seconds in water at 92°C and soaking for 24 hours, A3: Immersion in boiling water: seeds were immersed for 3 minutes in water at 92°C and soaking for 24 hours. The results of this study showed that the most effective treatment was A2B2 with 58% germination at 120 days. The A2B1 treatment allowed 44% germination and was the second best performer. While A1B1 with 4% was the treatment with the worst results, even below the 8% germination of the control. From the economic point of view, treatment A2B2 established a marginal rate of return of 813.33%, being very acceptable for the propagation of Guarango. Therefore, it is recommended to use commercial peat as substrate for future propagation studies.