Adubação via foliar e solo no comportamento de feijão-caupi (Vigna unguiculata (L.) Walp) a doenças foliares em campo em São Luís – MA

Abstract

Cowpea (Vigna unguiculata L.) is an alternative to common bean (Phaseolus vulgaris L.) already too cultivated and researched. The cowpea cultivar chosen for this experiment was BRS Guariba, as this is the bean seed donated by the Government of Maranhão to small farmers. The experiment was carried out, in the field, in the dry period, conducted in one of the experimental areas of the State University of Maranhão, Campus São Luís, in the following coordinates: 2º 30 'S and 44º 18' W, altitude of 24 m, whose soil of the area experimental was classified as red-yellow dystrophic argisol with weak sandy texture. The treatments were arranged in a 4x2 factorial scheme where four doses of molybdenum (Mo) were applied via leaf (0, 50, 250 or 500 g∙ha-1), and two doses of nitrogen (N) were applied via soil (0 or 50 kg∙ha- 1). The severity data of the experiment were subjected to analysis of variance using tables created in Microsoft Excel 365, where the compared averages of treatments (two by two) by the Tukey test sought to prove whether there was a significant difference or not between such treatments. There was no significant difference between treatments in the blocks, nor by the summation of all treatments (of all blocks) made in a single table. However, with the aid of the same software, graphics were created for a descriptive analysis of the cowpea behavior and we concluded that treatments with (500, 250, and 0) g∙ha-1 Mo (with and without nitrogen) did not can be recommended, but treatment with 50 g∙ha-1 of Mo (via leaf) with the dose of 50 kg∙ha-1 of N (via soil) can be recommended to producers.

Cowpea (Vigna unguiculata L.) is an alternative to common bean (Phaseolus vulgaris L.) already too cultivated and researched. The cowpea cultivar chosen for this experiment was BRS Guariba, as this is the bean seed donated by the Government of Maranhão to small farmers. The experiment was carried out, in the field, in the dry period, conducted in one of the experimental areas of the State University of Maranhão, Campus São Luís, in the following coordinates: 2º 30 'S and 44º 18' W, altitude of 24 m, whose soil of the area experimental was classified as red-yellow dystrophic argisol with weak sandy texture. The treatments were arranged in a 4x2 factorial scheme where four doses of molybdenum (Mo) were applied via leaf (0, 50, 250 or 500 g∙ha-1), and two doses of nitrogen (N) were applied via soil (0 or 50 kg∙ha- 1). The severity data of the experiment were subjected to analysis of variance using tables created in Microsoft Excel 365, where the compared averages of treatments (two by two) by the Tukey test sought to prove whether there was a significant difference or not between such treatments. There was no significant difference between treatments in the blocks, nor by the summation of all treatments (of all blocks) made in a single table. However, with the aid of the same software, graphics were created for a descriptive analysis of the cowpea behavior and we concluded that treatments with (500, 250, and 0) g∙ha-1 Mo (with and without nitrogen) did not can be recommended, but treatment with 50 g∙ha-1 of Mo (via leaf) with the dose of 50 kg∙ha-1 of N (via soil) can be recommended to producers.