Abstract
Abstract Adequate plant nutrition is essential to attain higher yields. The objective was to determine potential-nutrient response curves and sufficiency ranges using the boundary line approach and balance indices of Kenworthy for interpreting the nutritional status of ‘Grand Nain’ banana cultivated in two environments. The study was carried out using a database containing leaf nutrient concentrations and yields of bananas cultivated on two areas located in Missão Velha-CE, and Ponto Novo-BA, Brazil. Plots with high-yielding plants, which were those with yields above average plus 0.5 standard deviation, were used atem as reference population. The database was subdivided into two sets. One of them contained 46 leaf tissue samples and reference population with yield greater than 58.84 Mg ha-1 year-1, in Missão Velha-CE. The second data set contained 19 samples and reference population with yield greater than 76.12 Mg ha-1 year-1 in Ponto Novo-BA. Potential response curves were fitted to the relationship between relative yield and leaf element concentrations and balance indices of Kenworthy. Models expressed high predictive power. Sufficiency ranges for macro- and micronutrient concentrations and balance indices of Kenworthy were established. The ranges allow an improved nutritional status assessment of irrigated ‘Grand Nain’ bananas.
Highlights
Assessing the nutritional status of plants is required when increasing crop production while lessening environmental degradation (ALI, 2018)
Sufficiency ranges have been used as a traditional tool in plant nutritional diagnosis; the method is statistic based and prone to interpreting mistakes due to variable element concentrations in leaves
As element concentrations in plant tissues are influenced by several environmental and crop-related factors, wide-ranging sufficiency ranges established under varying environmental conditions may lead to inaccurate diagnoses
Summary
Assessing the nutritional status of plants is required when increasing crop production while lessening environmental degradation (ALI, 2018). Sufficiency ranges have been used as a traditional tool in plant nutritional diagnosis; the method is statistic based and prone to interpreting mistakes due to variable element concentrations in leaves. This approach has been further criticized for not taking into consideration interactions between nutrients (BARKER; PILBEAM, 2007; MARSCHNER, 2012). As element concentrations in plant tissues are influenced by several environmental and crop-related factors, wide-ranging sufficiency ranges established under varying environmental conditions may lead to inaccurate diagnoses. Iheshiulo et al (2019) pointed out that methods that determine region-specific nutrient reference values may provide more accurate results; establishing region- and cultivar-specific sufficiency ranges can be significantly more advantageous
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