Abstract
The cowpea [Vigna unguiculata (L.) Walp] represents an important source of income and employment in the northeastern region of Para, also being a valuable source of protein in the diet, especially for the rural population. However, the productivity is low, mainly due to the low fertility of the soils used in the region for the cultivation of this plant. In this context, the correction of the factors responsible for the soil limitations that lead to nutrient deficiency, by means of lime, is of great practical importance for obtaining greater yields of crops grown in acidic soils. The objective was to evaluate the effects of five doses of lime in the production of cowpea beans, BR3-Tracuateua and BR2-Bragança cultivars and chemical attributes of a dystrophic oxisoil, at Tracuateua city. The study was a randomized block designed experimental in a factorial (5 × 2) with four replications. The terms of the factorial refer to five doses of limestone and two cowpea cultivars. Liming increased pH and concentrations of phosphorus, calcium and magnesium, reducing the Al concentration and saturation. Lime dosages did not provide significant increases in grain production. The cultivar BR3-Tracuateua was more efficient in all liming levels, producing more than 30% of grain than the BR-2 Bragança.
Highlights
The cowpea [Vigna unguiculata (L.) Walp.], known as black-eyed peas and/or macassar beans, is a plant that belongs to the Fabaceae family
In the case of soil acidity correction liming promotes neutralization of Al3+, pH elevation and supply Ca2+ and Mg2+, allowing the proliferation of roots with positive effects on shoot growth of plants (Natale et al, 2007). The objective of this experiment was to study the effects of liming on the chemical properties of a Yellow Oxisol and the productivity of two cultivars of V. unguiculata
The experiment was established in a randomized block design in a factorial arrangement (5 × 2), referring to the five levels of liming (0; 1; 2; 3 and 4 t lime ha-1) and two regional cultivars of cowpea (BR2 Bragança and BR3 Tracuateua), with four replications, consisting of 40 experimental units
Summary
The cowpea [Vigna unguiculata (L.) Walp.], known as black-eyed peas and/or macassar beans, is a plant that belongs to the Fabaceae family (subfamily Faboideae). The Northeast annually produced 426.367 t, confirming its superiority over other producing regions It had the lowest average yield (330 kg ha-1) compared to other regions (Freire Filho et al, 2012). In the case of soil acidity correction liming promotes neutralization of Al3+, pH elevation and supply Ca2+ and Mg2+, allowing the proliferation of roots with positive effects on shoot growth of plants (Natale et al, 2007). The objective of this experiment was to study the effects of liming on the chemical properties of a Yellow Oxisol and the productivity of two cultivars of V. unguiculata
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