Reclamation of salinized soils due to excess of fertilizers: evaluation of leaching systems and equations

Abstract

In regions with intense irrigation, the use of fertirrigation increases crop productivity, but excessive fertilizer application increases the risk of soil salinization. Therefore, this work used leaching equations to evaluate systems of remediation of soils salinized by excess fertilizers. The phases of the study were: salinization of soils in lysimeters, remediation of these soils, and measurement of salt concentrations in soils for comparison with estimates of empirical equations. The treatments combined soil remediation systems (continuous and intermittent) with five initial levels of soil salinity (2.0, 4.0, 6.0, 8.0, and 10.0 dS m-1). The experimental design was randomized blocks with six replicates. The Volobuyev equation best represented the salinized soil remediation in relation to the results obtained experimentally. The equations tested showed better performance in the intermittent remediation system compared to the continuous system.

Intelligent System for Monitoring Water Content and Solute Concentrations in Soil Cultivated with Fertigated Lisianthus

“…During the cultivation cycle, no symptoms of nutritional deficiency or signs of toxicity were verified in lisianthus plants. This fact reinforces the statement that the management of fertigation allows the maintainence of ionic relationships favorable for the development of the crop, both in the solution and in the solid phase of the soil [14,28].…”

“…Through the applied nutrient accumulation curves (Figures 4 and 5) it is possible to know the nutritional demand at each growth stage. Thus, the risk of applying excessive doses of fertilizers can be reduced, as well as reducing the risk of providing doses below the minimum required by the plant to achieve productivity goals [28].…”

“…Considering that fertilizer application is monitored regularly, there is generally no need for intentional applications of leaching fractions, avoiding possible waste of water, energy, and fertilizers, in addition to subsoil contamination [28].…”

Assessing Leaching Requirement an Ameliorated Saline Soil in a Lysimeter Experiment

“…When considering the outcomes of the Ayers and Wescot (1994) method, as demonstrated in the study conducted by (Silva et al, 2019), the leaching ranged from 402-502 mm (Figure 2). These findings aligned closely with the modeling results despite the measured EC values being higher than the values predicted by the model.…”

“…Understanding leaching requirements for salinesodic soil under soil amendment is necessary (Silva et al, 2019;Tagar et al, 2010). Therefore, the research objective was to assess the effect of soil amendment on the leaching requirement of salinesodic soil in a lysimeter experiment.…”