Diagnostic Methods to Assess the Nutritional Status of the Carrot Crop

Abstract

. The four diagnostic methods generated similar reference values of nutrients, but different from those found in the literature. Leaf diagnosis through nutrient content in the shoot at harvest time indicated Mn as the most limiting nutrient for growing carrot, followed by Mg, K, and Ca.

DRIS indices in three phenological stages of the carrot crop

“…Subsequently, the leaf nutrient content that provides a null or balanced index was obtained. The optimum range for each nutrient was obtained based on the leaf nutrient contents of the reference population ± 2/3 of the standard deviation (Dezordi et al 2016). These contents and the optimum ranges generated by DRIS were compared with contents and sufficiency ranges reported in the literature (Malavolta et al 1997, Hanlon & Hochmuth 2009).…”

“…The Diagnosis and Recommendation Integrated System (DRIS) method was developed by Beaufills (1973) and has been used to interpret results of foliar analysis in several crops (Gott et al 2014, Dezordi et al 2016. It considers the dual relationship between nutrients, and not only the single contents in plant tissues, with advantages regarding simpler methods, such as the Critical Level and the Sufficiency Range (Gott et al 2014).…”

“…Para K, Ca, Mg, S e Mn, há concordância entre a diagnose realizada nas fases precoces e a efetuada na colheita, o que indica possibilidade de diagnose precoce da limitação desses nutrientes. The knowledge of nutritional demand indicates the appropriate doses of nutrients, increasing profits and minimizing nutrient losses (Singh et al 2012, Dezordi et al 2015, while leaf analysis may indicate nutritional disorders and define more precise fertilization doses for the crop (Malavolta et al 1997). In carrot fields from the Alto Paranaíba region, the most limiting nutrients for carrot are Mn and K, indicating the need to adjust the fertilization with these nutrients (Dezordi et al 2016).…”

“…The knowledge of nutritional demand indicates the appropriate doses of nutrients, increasing profits and minimizing nutrient losses (Singh et al 2012, Dezordi et al 2015, while leaf analysis may indicate nutritional disorders and define more precise fertilization doses for the crop (Malavolta et al 1997). In carrot fields from the Alto Paranaíba region, the most limiting nutrients for carrot are Mn and K, indicating the need to adjust the fertilization with these nutrients (Dezordi et al 2016). Dezordi et al 2016 established diagnostic indices for the crop at the harvest time, what do not allow the deficiency correction at the same season.…”

“…In carrot fields from the Alto Paranaíba region, the most limiting nutrients for carrot are Mn and K, indicating the need to adjust the fertilization with these nutrients (Dezordi et al 2016). Dezordi et al 2016 established diagnostic indices for the crop at the harvest time, what do not allow the deficiency correction at the same season.…”