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Adubação mineral no crescimento e composição mineral da palma forrageira –Clone IPA-201

2010; UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; Volume: 5; Issue: 1 Linguagem: Inglês

10.5039/agraria.v5i1a591

1981-1160

José Carlos Batista Dubeux, José Teixeira Filho, Mércia Virgínia Ferreira dos Santos, M. A. Lira, Djalma Cordeiro dos Santos, Ricardo Alexandre Silva Pessoa,

Cassava research and cyanide

The study was carried out in the greenhouse of the "Instituto Agronômico de Pernambuco - IPA", located in Recife – PE. It aimed to evaluate the effects of P and K fertilization on growth and chemical composition of cactus pear IPA-20 clone. Four levels of P (0, 200, 400, and 800 kg P2O5 ha-1) and four levels of K (0, 200, 400, and 800 kg of K2O ha-1) were tested in a 4 x 4 factorial arrangement using a complete randomized block design. Observations were made at 28-d intervals, starting by the third month after planting and lasting until the sixth month of growth. Fresh matter yield of primary articles and total fresh matter yield were affected only by K fertilization (P < 0.05). Concentrations of N, K, Ca, Mg, and S in the cactus shoot were affected by P fertilization (P < 0.05), however, P concentration was not affected. Potassium fertilization affected (P < 0.05) only Ca and S concentrations. Average results for N, P, K, Ca, Mg, and S were 20.62, 4.75, 33.43, 34.43, 7.44, and 6.10 g kg-1, respectively. Fresh matter yield and dry matter concentration were affected only by K fertilization. Micronutrient concentration was not affected by P and K fertilization.