Nitrogen and micronutrients on grain yield of cowpea inoculated

Raimundo Nonato Lopes Martins, Rafaela Simão Abrahão Nóbrega, Alessandro Franco Torres Silva, Júlio César Azevedo Nóbrega, Francisco Hélcio Canuto Amaral, Elaine Martins Costa, José Ferreira Lustosa Filho, Linnajara Vasconcelos Martins

Abstract


This work aimed to study the effect of nitrogen and micronutrients addition on nodulation and on the productivity of cowpea inoculated with strain INPA 03 11B. The study was carried out in the experimental area of Universidade Federal do Piauí, Bom Jesus, PI. The experiment was a complete randomized block, with four replications and a 5 x 2 factorial arrangement. Treatments consisted of five nitrogen doses (0, 35, 70, 105, 140 kg ha¹), associated with and without foliar micronutrients application (300 g ha¹ boric acid; 500 g ha¹ copper sulphate, manganese sulphate, zinc sulphate and 60 g ha¹ ammonium molibdate). Nodulation, shoot, root and total dry mass, relative efficiency, components of yield and crop productivity, besides N accumulation in shoot and grains were evaluated. Fresh and dry mass of nodules reduced linearly with the increase of N doses. Yield components were not affected by nitrogen and micronutrients fertilization. The application of micronutrients in the absence of nitrogen promoted an increase of 12.4% in grain yield of cowpea inoculated.


Keywords


Fertilization; N2 biologic fixation; Vigna unguiculata.



DOI: http://dx.doi.org/10.5433/1679-0359.2013v34n4p1577

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional