Concentration of injetion solution and its effects on soil and on yield of fertirrigated banana cv. Terra Maranhão

Eugênio F Coelho,Torquato M De Andrade Neto,Damiana L Barros

doi:10.1590/s0100-69162014000600007

Eugênio F Coelho, Torquato M De Andrade Neto + Show 1 more

Open Access

https://doi.org/10.1590/s0100-69162014000600007

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Abstract

The Fertigation is the combined application of water and nutrients to a crop. It can be adapted to all types of agricultural crops. The objective of this study was to evaluate the effect of urea concentration in irrigation water on electrical conductivity of the soil solution and saturation extract along the first cycle of banana cv. Terra Maranhão. The experiment followed a completely randomized design with six treatments and ten replications. Treatments regarded for using three urea concentrations (1.0; 2.5 and 4.0 g L-1) in irrigation water applied by two micro irrigation systems (microsprinkler and drip). Results showed that there was a linear elevation of electrical conductivity of saturation extract and soil solution with the increase on concentration of urea in the injection solution. Urea should be used under concentrations up to 2.5 g L-1 in irrigation water without causing increase on electric conductivity of soil solution and saturation extract, considering 1.1 dS m-1 as the tolerated value for the crop. Nitrate in the soil solution increased significantly with the increase of urea concentration in the injection solution. The maximum concentration of nitrate in the soil occurred for 4,0 g L-1 concentration of the injection solution.

Highlights

The Fertirrigation is a technique that combines the application of water with fertilizers through certain irrigation systems
Different concentrations of salt in irrigation water provide different levels of electrical conductivity of the soil solution and the saturation extract. In this sense, promoting the direct monitoring of salinity in the root zone is recommended to evaluate the current situation and the effectiveness of various management programs in irrigated areas
Except for the concentration of 1.0 g L-1 there were no significant differences between means of electrical conductivity in the saturation extract (ECse) or electrical conductivity of the stratum saturation (ECss) observed for the two irrigation systems

Summary

Introduction

The Fertirrigation is a technique that combines the application of water with fertilizers through certain irrigation systems. The use of this technique has made it possible to optimize the use of inputs in different irrigated crops, both in aspects related to productivity and the quality of the obtained products, being most notable its adoption in irrigated crops by localized irrigation. Monitoring the soil salinity becomes crucial especially where fertirrigation is practiced. This misguided technique can raise the salinity of the soil, even if temporarily. Studies using EC have pointed out their potential for measuring the nutrient content in the soil solution (ANDRADE NETO et al, 2012)

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