Abstract
ABSTRACT One of the factors determining success in tomato production is plant nutrition. The diagnosis and recommendation integrated system (DRIS) is a tool used to obtain fertilizer recommendations. The objective of this study was to determine DRIS indices using petiole sap analysis (PSA) and compare them with those obtained using leaf analysis in two tomato cultivars grown under greenhouse conditions. A complete randomized design with eight treatments and 60 plants per experimental unit was used. To determine whether employing PSA with the DRIS methodology can provide a reliable diagnosis of fertilization, doses of some elements, such as N, P, or K, were reduced by 30% and supplied to two tomato cultivars, namely, Cid and Moctezuma. The indices for PSA-DRIS and DRIS were estimated. R2 values greater than 0.84 were obtained for the relationships between the leaf concentrations and petiole extract (PE) concentrations of some elements in both tomato cultivars. The PSA-DRIS method detected 62.5% of the cases of deficiency identified via DRIS. The PSA-DRIS method is a low-cost way to rapidly fertilize recommendations in tomato.
Highlights
Um dos fatores que determina o sucesso na produção de tomate é a nutrição das plantas
Foliar analysis is considered very practical for the diagnosis of nutritional disorders (Dezordi et al, 2016) and is superior to soil analysis for determining the nutritional status of a crop as soil analysis only determines the nutrients immediately available in the soil (Shunfeng et al, 2018)
Rapid NPK diagnosis in tomato using petiole sap analysis with the diagnosis and recommendation integrated system (DRIS) method equipment are available for measuring the concentrations of ions in plant sap, such as colorimeters and specific ion electrodes (Hochmuth et al, 2004), that yield values with strong correlations (r2=0.96, p
Summary
Um dos fatores que determina o sucesso na produção de tomate é a nutrição das plantas. Rapid NPK diagnosis in tomato using petiole sap analysis with the DRIS method equipment are available for measuring the concentrations of ions in plant sap, such as colorimeters and specific ion electrodes (Hochmuth et al, 2004), that yield values with strong correlations (r2=0.96, p
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