Response of cowpea to water levels and phosphate fertilizer on the savanna of Roraima

• Published in: Ciência agronômica Vol. 42; no. 4; p. 872
• Main Authors: Oliveira, G.A, Araújo, W.F, Cruz, P.L, Silva, W.L.M. da, Ferreira, G.B
• Format: Journal Article
• Language: Portuguese
• Published: Fortaleza Universidade Federal do Ceará, Centro de Ciências Agrárias 01.10.2011
• Subjects: ADUBAÇÃO; AMAZONIA; AMAZONIE; AMAZÔNIA; APLICACIA³N DE ABONOS; FA³SFORO; FEIJÃO DE CORDA; FERTILISATION; FERTILIZER APPLICATION; FÓSFORO; http://www.fao.org/aos/agrovoc#c_10795; http://www.fao.org/aos/agrovoc#c_32372; http://www.fao.org/aos/agrovoc#c_3954; http://www.fao.org/aos/agrovoc#c_5804; http://www.fao.org/aos/agrovoc#c_8247; IRRIGATION; IRRIGAÇÃO; PHOSPHORE; PHOSPHORUS; PRODUTIVIDADE; RIEGO; VIGNA UNGUICULATA
• ISSN: 0045-6888; 1806-6690

This work was carried out to evaluate the effect of irrigation depth and phosphate fertilizer (0; 70; 140; 210 kg ha-1 de P2O5) on yield and production components of cowpea (Vigna unguiculata L. Walp) cv. Novaera at the Savanna of Roraima, Brazil. The experimental design was arranged in a completely randomized block in split-plot and four replications. Irrigation depths were applied through a sprinkler line source system. The principal treatments constituted on the depths of irrigation and the secondary treatments by the phosphate fertilizer. Significant effects (p < 0.05) of the depth of irrigation and phosphate fertilizer interaction with aerial mass production and mass of 100 grains were observed. The number of grains per pods and size of pod were affected by the phosphate fertilizer only. The highest economical yield (1.306 kg ha-1) was obtained by 89.45 kg of P2O5.