Details

Autor(en) / Beteiligte

• de Castro, Gustavo Franco
• Zotarelli, Lincoln
• Mattiello, Edson Marcio
• Tronto, Jairo

Titel

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.