Índices críticos de diagnóstico composicional de nutrientes (CND) e sua validação em campos de trigo

• Abolfazl Geiklooi Former Ph.D student of Soil Science Department, Faculty of Agriculture, University of Tabriz, Tabriz, Iran. http://orcid.org/0000-0001-8872-7332
• Adel Reyhanitabar Professor of Soil Science Department, Faculty of Agriculture, University of Tabriz, Tabriz, Iran. http://orcid.org/0000-0003-1066-9130
• Nosratollah Najafi Professor of Soil Science Department, Faculty of Agriculture, University of Tabriz, Tabriz, Iran http://orcid.org/0000-0002-5560-1132

Palavras-chave: diagnóstico composicional de nutrientes (CND), sistema integrado de diagnóstico e recomendação (DRIS), composição de nutrientes, análise de componentes principais (PCA)

Resumo

A composição de nutrientes da planta pode ser usada como um critério de avaliação para o crescimento ideal da planta. Os objetivos do presente estudo foram (a) derivar normas de nutrientes de composição crítica (CND) para campos de trigo sobreviventes e faixas de suficiência como índice de nutrientes CND para amostras de validação, (b) fornecer um índice de desequilíbrio nutricional de limiar de CND ao quadrado (CND r2) e comparar com Os índices de desequilíbrio de nutrientes DRIS, (c) determinam a concentração de nutrientes equilibrada com os índices CND. O valor de corte de rendimento foi de 4.232 kg.ha-1. Os resultados dos índices CND indicam que Zn é o nutriente mais deficiente em trigo, seguido por Cu, Fe, Mn e B, enquanto N é o nutriente mais excessivo, seguido por K, Ca, Mg e P. Nos ensaios de validação, o rendimento o valor de corte foi de 5.023 kg.ha-1. O CND r2 calculado na população de validação foi inferior ao dos campos de trigo da pesquisa, indicando uma concentração mais equilibrada de nutrientes devido à aplicação de tratamentos de fertilizantes. Cargas significativas de componentes principais (PC) foram obtidas após a rotação varimax. Os três primeiros PCs em subgrupos de alto e baixo rendimento e conjunto de dados inteiro indicaram 52,8; 54,6 e 48,8% de variância total, respectivamente. Este estudo revelou que o declínio na produtividade do trigo foi devido ao desequilíbrio de nutrientes associado à deficiência de multi nutrientes (Zn, Cu, Fe, Mn e B) e ao excesso de multi nutrientes (N, K, Ca, Mg e P).

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