Aplicação do cálcio e de fontes de silício na severidade da antracnose do feijão-fava (Phaseolus lunatus L.)

Abstract

Fava beans (Phaseolus lunatus L.), besides constituting one of the alternative sources of income and food for the population, it is also used as animal feed and green manure. However, the incidence of diseases has been one of the limiting factors of increasing productivity, and anthracnose, caused by Colletotrichum truncatum, is one of the most important diseases. The objective of this work was to study the influence of silicon and calcium in anthracnose severity of the fava beans. The experiment was conducted in a completely randomized design. In series, was evaluated four dosages of calcium carbonate (2,4, 6 and 8 g kg-1 of soil) and four dosages of Rocksil and MB4 (0,05; 0,075; 0,1 e 0,15 g kg-1 de solo). It was observed a reduction of 66,4%; 75,34% to 77,58% in the severity of disease in plants treated with calcium carbonate, Rocksil and MB4, respectively. There was no correlation between sources of calcium and silicon tested with seed weight or with the content of chlorophyll in plants evaluated.