Prediction of molybdenum availability to plants in differentiated soil conditions

Abstract

The aim of the study was to assess of plant available molybdenum (Mo) resources in the solutions of soils as well as to evaluate the effects of selected soil properties on changes of the Mo concentration in the soil solution. Sixty-two soil samples were investigated. The soil solutions were obtained by modified vacuum displacement method. The results showed that Mo concentrations in the soil solutions were much differentiated, ranging from 0.002 to approximately 0.100 µmol/L. Positive correlations were found between soil solution Mo concentration and soil pH as well as the contents of available phosphorous and organic carbon in soil. At the same time, Mo concentration was higher in the soil solutions obtained from soils with larger amounts of soil particles with diameter lesser than<br /> 0.02 mm. Among the analysed soil parameters in this study, soil pH is the most important factor that influences the Mo concentration in soil solution. Studies have shown that in acid sandy soils the amount of molybdenum found in the soil solution is too small to cover the nutritional requirements of the plants. This indicates the need of fertilization with this element. Regular liming of soils and fertilization with phosphorus can improve the availability of molybdenum to plants.

Acid-Modified and Unmodified Natural Clay Deposits for In Situ Immobilization and Reducing Phytoavailability of Molybdenum in a Sandy Loam Calcareous Soil

“…We found a significant positive relationship between soil pH and the availability of soil Mo (extracted with water and/or AB-DTPA; Table 2), suggesting that Mo availability is dependent upon soil pH. Previous studies also suggested that alkaline soils increase Mo availability [8,9,56,57]. Another study by Rutkowska et al [57] also found a significant positive correlation between Mo availability and soil pH in the soil, which further supports this interpretation.…”

“…Previous studies also suggested that alkaline soils increase Mo availability [8,9,56,57]. Another study by Rutkowska et al [57] also found a significant positive correlation between Mo availability and soil pH in the soil, which further supports this interpretation. They suggested that this relationship was mainly caused by an increase in free negative charges onto the soil colloidal surfaces, which led to electrostatic repulsion between Mo anions and soil particles [56,57].…”

“…They suggested that this relationship was mainly caused by an increase in free negative charges onto the soil colloidal surfaces, which led to electrostatic repulsion between Mo anions and soil particles [56,57]. Additionally, the excess amount of hydroxyl anions in alkaline soils can compete strongly with Mo anions onto the soil adsorption sites, resulting in more available soil Mo concentration [57,58].…”

Evaluating the Aqueous Phase From Hydrothermal Carbonization of Cow Manure Digestate as Possible Fertilizer Solution for Plant Growth

“…Alkaline pH limits especially the availability of micronutrients (i.e., Cu, Fe, Mn, and Zn;Rengel, 2015) to the plants but also of some macronutrients (i.e., P; Ramírez-Rodríguez et al, 2007;Gentili et al, 2018). Among the micronutrients, the only exception is Mo, which appears to be less available at acidic pH and more available under alkaline pH (Rutkowska et al, 2017).…”

Seeds enriched with molybdenum improve cowpea yield in sub‐humid tropical regions of Brazil

“…The soil at the trial sites was poor in Mo (0.12 mg kg −1 ), as agricultural soils generally range from 0.2 to 5.0 mg kg −1 (Rutkowska, Szulc, Spychaj-Fabisiak, & Pior, 2017). The soil of the 2017 trial was not analyzed for Mo content, but the site was located 265 m from the site used in 2018.…”