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Alginate beads containing layered double hydroxide intercalated with borate: a potential slow-release boron fertilizer for application in sandy soils
Ist Teil von
New journal of chemistry, 2020-10, Vol.44 (39), p.16965-16976
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Boron (B) is very soluble and mobile in soil, and for this reason, it can be easily leached when applied as boric acid (H
3
BO
3
), particularly in sandy soils. High application rates of B may be toxic to plants. Alginate beads containing layered double hydroxides intercalated with borate (LDH-B-ALG) can potentially minimize the B leaching in soils and reduce the toxicity to plants. The aims of this work were to evaluate the leaching of B in sandy soils from different B sources such as H
3
BO
3
, Ulexite, and alginate beads containing H
3
BO
3
(BA-ALG), and LDH-B-ALG, and investigate the bioavailability of B from these sources in consecutive cultivations of plants. The LDH-B-ALG was synthesized, characterized, and evaluated through the B leaching test in sandy soil. For the leaching column study, the B sources were homogenized with the soil, and incubated before leaching. Sunflower and cotton were cultivated for two seasons in a greenhouse experiment without leaching. Additionally, a greenhouse experiment with leaching was carried out, in which sunflower and cotton were sequentially cultivated after B leaching. In the leaching tests, throughout the incubation time, the percentage of B leached from LDH-B-ALG was significantly lower compared to other B commercial sources. In a greenhouse experiment with leaching, the residual concentration of B in the soil after first cultivation was 1.57, 0.73, 0.66, and 0.61 mg dm
−3
of B for LDH-B-ALG, Ulexite, H
3
BO
3
, and BA-ALG treatments, respectively. The residual B in the soil was significantly higher for LDH-B-ALG compared to the other B sources after first cultivation, and, resulted in a higher B uptake in shoots and total (shoots and roots) for the cotton (second cultivation) and for the sum of sunflower and cotton (total cultivation). These results suggest that LDH-B-ALG can improve the B accumulation in topsoil, the fertilizer efficiency, and also B uptake by plants.
Alginate beads containing layered double hydroxide intercalated with borate: a new fertilizer to reduce boron leaching and increase plant uptake.