Relationships between soil class and nutritional status of coffee plantations

Abstract

SUMMARYFarm planning requires an assessment of the soil class. Research suggest that the Diagnosis and Recommendation Integrated System (DRIS) has the capacity to evaluate the nutritional status of coffee plantations, regardless of environmental conditions. Additionally, the use of DRIS could reduce the costs for farm planning. This study evaluated the relationship between the soil class and nutritional status of coffee plants (Coffea canephora Pierre) using the Critical Level (CL) and DRIS methods, based on two multivariate statistical methods (discriminant and multidimensional scaling analyses). During three consecutive years, yield and foliar concentration of nutrients (N, P, K, Ca, Mg, S, B, Zn, Mn, Fe and Cu) were obtained from coffee plantations cultivated in Espírito Santo state. Discriminant analysis showed that the soil class was an important factor determining the nutritional status of the coffee plants. The grouping separation by the CL method was not as effective as the DRIS one. The bidimensional analysis of Euclidean distances did not show the same relationship between plant nutritional status and soil class. Multidimensional scaling analysis by the CL method indicated that 93.3 % of the crops grouped into one cluster, whereas the DRIS method split the fields more evenly into three clusters. The DRIS method thus proved to be more consistent than the CL method for grouping coffee plantations by soil class.Index terms: DRIS, critical level, plant nutrition, nutritional diagnosis, soil classification, oxisol, Coffea canephora. RESUMO: RELACIONAMENTO ENTRE CLASSES DE SOLO E O ESTADO NUTRICIONAL DE LAVOURAS CAFEEIRAS

DRIS standard and normal ranges of foliar nutrients for the culture of ‘Thompson’ atemoya

“…Interpretation of the indices thus obtained by DRIS standard was done based on the potential response to fertilization (PRA), in its 5 response classes, viz., positive (p), positive or nil (pz), null (z), negative or nil (nz) and negative (n), as proposed by WADT (2005). The classes thus demarcated were grouped and named, based on their influence on the productivity, as follows: limiting by lack (LF = p + pz), limiting by excess (LE = n + nz), or non-limiting (NL = n), according to SILVA et al (2005).…”

Antecipação do período de diagnose foliar em laranjeira 'Pêra' no Amazonas

“…O somatório, em módulo, dos índices CND dos nutrientes, em cada pomar de baixa produtividade e em cada estádio fenológico, constituiu o índice de balanço nutricional (IBN (Wadt, 2005).…”

Avaliação nutricional de feijoeiro irrigado pelos métodos CND, DRIS e faixas de suficiência

“…Nas lavouras de baixa produtividade, o nutriente foi considerado nutricionalmente equilibrado tanto para a CND quanto para o DRIS, quando o índice nutricional, em módulo, foi menor que o IBNm; insuficiente, quando seu índice nutricional sendo negativo foi também, em módulo, maior que o IBNm; e, em excesso nutricional, quando seu índice nutricional sendo positivo foi, também, em módulo, maior que o IBNm (Wadt, 2005). Para a interpretação do estado nutricional pelo método das FSs, foram estabelecidas três classes nutricionais: deficiente, suficiente e consumo de luxo.…”