Relações entre o coeficiente de cultura e cobertura vegetal do feijoeiro: erros envolvidos e análises para diferentes intervalos de tempo - DOI: 10.4025/actasciagron.v26i4.1815

The purpose of this work was to evaluate the errors involved in the use of evapotranspirometers to determine the relation between the crop coefficient (kc) and the percentage of vegetative ground cover (%CVeg) of the bean plant, calculated for average intervals varying from one to ten days, and the influence of these intervals on the relations obtained, as well as to compare two ways of analyzing kc data. The experiment, which involved the sowing of beans in four evapotranspirometers, was conducted at the IAC – Campinas Institute of Agronomy. The kc was determined for the intervals evaluated here, based on the water balance. The main errors identified involved the uncontrolled entrance of water and the greater development of the plants sown inside the evapotranspirometers than those surrounding them. A sequential analysis allowed for a greater availability of data from which to derive the relations between kc and %CVeg, which were statistically significant in all the forms of analysis and intervals evaluated