Boron Bioavailability Derived from Three Sources in Two Soil Types of Boron
Boron (B) is an essential element for plants and is involved in many physiological processes. B effect on plant productivity relies on its bioavailability in the soil solution. The solubility of the B source is directly associated with B bioavailability in plants. In order to determine B bio-availability after the application of various sources, an experiment was set up in soil columns, where two types of soil with different textures and B content were evaluated: Sandy soil (299 g kg-1 of clay and 0.2 mg dm-3 of B) and clay soil (727 g kg-1 of clay and 0.4 mg dm-3 of B). B sources were treatments with two low-solubility sources (powder and granulated ulexite) and three high-solubility sources (boric acid and finegra- ined [Fertibor], and coarse-grained [Granubor]) sodium tetraborate. The experimental design was a completely randomized block with four repetitions. Each experimental unit had 0.0157 m3 of soil con- tained in a PVC pipe (0.7 m high by 0.1 m in diameter). The porous space of the soil in the columns was saturated with 60% water, and B sources were subsequently applied on the soil surface. The weekly supply of deionized water started later, using a drip system. Dosage rates were 0.5 ml and 0.8 ml in sandy and clay soils, respectively. The B content of the percolated solution was analyzed at the end of each week. This study was conducted in a 40-week time period. The analysis of percolated solutions showed a higher B bioavailability as a result of treatments with high-solubility sources, with over 90% of B released within the first 10 weeks in both soils. After 30 weeks, the B released was over 95% of the total B applied in the columns. In average, it was estimated that during the first 10 weeks, an amount of 9.3 mm of water per each percentage point of B is released. On the contrary, in average, less soluble B sources in both soil types showed 47% of total B released after 40 weeks. At the conclusion of the experiment, the B content of the soil was analyzed. Sandy soil was found to have a higher B content in the treatments of the less soluble sources, while in clay soil all treatments showed higher B content in the control that did not receive B. However, no differences were found between B sources. Highly soluble B sources released almost 100% of B, while less soluble sources released less than 50% of B.
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Fedepalma
2019
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| Online Access: | https://publicaciones.fedepalma.org/index.php/palmas/article/view/13045 |
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| Summary: | Boron (B) is an essential element for plants and is involved in many physiological processes. B effect on plant productivity relies on its bioavailability in the soil solution. The solubility of the B source is directly associated with B bioavailability in plants. In order to determine B bio-availability after the application of various sources, an experiment was set up in soil columns, where two types of soil with different textures and B content were evaluated: Sandy soil (299 g kg-1 of clay and 0.2 mg dm-3 of B) and clay soil (727 g kg-1 of clay and 0.4 mg dm-3 of B). B sources were treatments with two low-solubility sources (powder and granulated ulexite) and three high-solubility sources (boric acid and finegra- ined [Fertibor], and coarse-grained [Granubor]) sodium tetraborate. The experimental design was a completely randomized block with four repetitions. Each experimental unit had 0.0157 m3 of soil con- tained in a PVC pipe (0.7 m high by 0.1 m in diameter). The porous space of the soil in the columns was saturated with 60% water, and B sources were subsequently applied on the soil surface. The weekly supply of deionized water started later, using a drip system. Dosage rates were 0.5 ml and 0.8 ml in sandy and clay soils, respectively. The B content of the percolated solution was analyzed at the end of each week. This study was conducted in a 40-week time period. The analysis of percolated solutions showed a higher B bioavailability as a result of treatments with high-solubility sources, with over 90% of B released within the first 10 weeks in both soils. After 30 weeks, the B released was over 95% of the total B applied in the columns. In average, it was estimated that during the first 10 weeks, an amount of 9.3 mm of water per each percentage point of B is released. On the contrary, in average, less soluble B sources in both soil types showed 47% of total B released after 40 weeks. At the conclusion of the experiment, the B content of the soil was analyzed. Sandy soil was found to have a higher B content in the treatments of the less soluble sources, while in clay soil all treatments showed higher B content in the control that did not receive B. However, no differences were found between B sources. Highly soluble B sources released almost 100% of B, while less soluble sources released less than 50% of B.
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