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The duration of the rainy season (DPLL) concept is a proposal to improve the concept called length of growing period (LPC). The objective of this work was the proposal of a map of aptitude for rainfed agriculture based on the selection of a model of Duration of the period of rainfall calculated with the humidity index. 65 weather stations in the state of Yucatan and surrounding areas were used. The models were visually compared with the map of potential vegetation. It was found that the humidity index is greater when it comes from MT. The best map was obtained with the method of the humidity index calculated with the evapotranspiration estimated with MT with a value of wet month of 0.65. The Gaussian geostatistical model has a r2 = 0.98 and percentage of variance explained by C/(C0 + C) = 74 %. Interpolation presented a r = 0.63 and the root mean square error RMSE = 1.34. Five intervals of humidity months of agricultural interest were identi ed: three to four months, four to ve months, ve to six months, six to seven months, and seven to eight months.
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