With the objective to study the influence of the net radiation, air temperature, precipitation and photoperiod in the phytomass production and flowering date of Crotalaria juncea and Mucuna aterrima, an experiment was conducted in São Vicente da Serra, MT, in the experimental area of Escola Agrotécnica Federal de Cuiabá, MT, Brazil, during 1999 and 2000. The experimental design was the randomized blocks, with three replications. The Mucuna yield was higher at all times; the relation ETr/ETp was the variable that best correlated with Mucuna yield, while in the Crotalaria it was photoperiod. Flowering of Mucuna was affected by the temperature, where as for the Crotalaria it was affected by photoperiod.
Crotalaria juncea; Mucuna aterrima; sowing date
