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The main objective of this research was to evaluate the biomass yield of four maize cultivars. Carried out at Finca Aranda, Corregimiento de Pocrí, District of Pocrí, Province of Los Santos, during the rainy season. For this purpose, initially, the morphoclimatic characterization is carried out and the climatic aggressiveness curves of the rain are estimated through the modified Fournier index (INF), adjusted to the Purio river sub-basin. Subsequently, the maize cultivars P30-F35, SV 1020, IDIAP 1102 and ADV 9293 were evaluated. A randomized complete forest design (DBCA) was implemented, with four treatments and five blocks or repetitions. As a result, it was obtained that the space that includes the middle and upper basin of the Purio river exposes very high estimated values of climatic aggressiveness >160; while the lower basin registers values considered high >120 and <160. However, for the biomass yield variable, the cultivar P30-F35 obtained the highest average with 28 Kg, followed by SV 1020 with 26 Kg, ADV 9293 24 Kg and IDIAP 1102 with 22 Kg. Concluding that there was no significant difference, the choice of cultivar to use is subject to the cost of seed in the market and the technological level of cultivation.
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