Abstract

BARZAN., Renan Ribeiro et al. Management of nutrients in solution based on electrical conductivity andionic concentrations in leached of tomato (Lycopersicon esculentum Mill.). Acta Agron. [online]. 2020, vol.69, n.3, pp.196-202.  Epub Aug 30, 2021. ISSN 0120-2812.  https://doi.org/10.15446/acag.v69n3.81441.

Fertigation is characterized by greater efficiency in the use of inputs such as water and fertilizers, in addition to the ease of programming the application of nutrients according to crop requirements. The objective of this study was to evaluate two different forms of fertigation management using leachates resulting from the application of synthetic inputs in tomato cultivation (Lycopersicon esculentum Mill.). Management was based on the electrical conductivity (EC) and individual ion concentration (CI) in the leachate, with two initial base levels of nutrients (1.6 and 3.2 dS / m). Leachates were collected every week to analyse EC and IC of N, P, K, Ca, Mg and S, and based on this, manage nutrients in solution. When the EC value was less than or greater than 20% of the established value, the nutrient solution was diluted or concentrated in an equal percentage, adding water or a main solution (20 dS / m), respectively. Results showed that applications of N, P and K were higher in IC management, but not so for Ca and Mg, which affects the nutritional status of the plant. Phytotechnical parameters of tomato fruits presented better characteristics when CE is used as a criterion for fertigation management, while the increase in the initial level of nutrients was reflected in a higher production.

Keywords : Lycopersicon esculentum Mill.; Protected cultivation; Fertigation; Nutrient solution; Vegetable crop nutrition.

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