Copper micronutrient fixation kinetics and interactions with soil constituents in semi-arid alkaline soils

Abstract

This study examined the fixation pattern and kinetics of plant-available [diethylene triamine pentaacetic acid (DTPA)-extractable] copper (Cu), as well as basic soil properties that influence Cu availability in selected semi-arid soils. Soil samples from six different series were used and data obtained from Cu extraction experiments fitted to various kinetic models. Soils were also characterized for a suite of chemical and physical properties. The majority (80%) of the plant-available Cu fixed over the experimental period of 90 d occurred within the first 14 d. The amount of plant-available Cu fixed within the first 14 d tended to be influenced by the combination of organic matter (OM) and pH. The total amount of Cu fixed at the end of the experimental period of 90 d was influenced by pH and a combination of pH and calcium carbonate. The fixation of plant-available Cu over the experimental period was better described by the power function model [R 2 = 0.90, Standard Error (SE) = 0.099] but poorly by the other models (R 2 : 0.58 to 0.59), while reactions within the first 35 d were better described by the second-order model (R 2 = 0.98, SE = 0.008), suggesting a different fixation pattern. Findings from this study provide a basis for a more mechanistic approach to evaluating and comparing the fixation of Cu micronutrient compounds in these semi-arid soils for more scientific management decision making.

Potential of Soil Fertility Management to Improve Essential Mineral Nutrient Concentrations in Vegetables in Dodoma and Kilombero, Tanzania

“…Similar negative correlation between soil pH and micronutrient availability, including that of Cu, was reported by [61]. Reference [60] reported increased fixation of Cu in long term period with increase in pH in semi-arid alkaline soils of Texas, USA. Although the Cu concentration in soil was sufficient, the availability of Cu to vegetable plants was low as shown by low Cu concentrations in vegetables from Kilombero.…”

“…Low availability of Cu in these soils was probably because of complex Cu fixation pattern in soils and influence of other soil constituents on availability of Cu for plant absorption. Reference [60] reported best fit of power model kinetics of Cu fixation in alkaline soils in the long term period but second order model in the short run, suggesting that Cu fixation changes over time and in the long term Cu fixation is nonlinear. On the other hand, in the short term, the Cu fixation is controlled by more than one soil property in addition to Cu concentration in soil [60].…”

“…Reference [60] reported best fit of power model kinetics of Cu fixation in alkaline soils in the long term period but second order model in the short run, suggesting that Cu fixation changes over time and in the long term Cu fixation is nonlinear. On the other hand, in the short term, the Cu fixation is controlled by more than one soil property in addition to Cu concentration in soil [60]. The positive correlation between soil P and vegetable K and Cu may be due to positive effect of P on root growth, which increases root interception and hence absorption of K and Cu by the vegetables [62].…”

Managing Micronutrients for Improving Soil Fertility, Health, and Soybean Yield

“…Wang et al [118] found some similarity of spatial structure between soil pH and the grain Cu, Fe, Mn, and Zn, and by analogy, similar spatial variation was observed between SOM and DTPA-extractable micronutrients in the soil. Udeigwe et al [119] examined the fixation pattern and kinetics of plant-available DTPA-extractable Cu, as well as basic soil properties that influence Cu availability in semiarid soils, while Zhao et al [120] used geostatistical methods for identifying the possible spatial distribution of Cu. Eze et al [121] used the sequential gaussian simulation (SGS) to map the spatial distribution of Cu concentration and modeled the spatial uncertainties for arable dryland in central Botswana.…”

Bakır, Çinko ve Fosfor İçerikli Priming Uygulamalarının Buğday ve Arpada Tohum ve Fide İçeriği Üzerine Etkileri

“…Cereals suffer from zinc and copper deficiencies (Jones, 2012;Kumar and Sharma, 2014). In general, the availability of these elements for plants are limited in different type of soils and strongly adsorbed by soil components such as iron oxides, carbonates and organic matter (Uygur and Rimmer, 2000;Flaten et al, 2004;Hettiarachchi et al, 2010, Chittamart et al, 2016Udeigwe et al, 2016). Copper has specific roles in nitrogen fixation, electron transport and energy absorbance, and protein and carbohydrate metabolisms (Jones, 2012;Marschner, 2012) therefore Cu deficiency results in yield and quality losses in wheat (Brennan and Bolland, 2008;Antosovsky and Ryant, 2015).…”