Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 12, Pages 6800-6808Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b01761
Keywords
Controlled release; Ferrous foliar fertilizer; Microcrystalline cellulose; Attapulgite; Chelation
Categories
Funding
- National Natural Science Foundation of China [21407151]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2015385]
- Key Program of the Chinese Academy of Sciences [KSZD-EW-Z-022-05]
- Science and Technology Service Programs of the Chinese Academy of Sciences [KFJ-EW-STS-083, KFJ-EW-STS-067]
- President Foundation of Hefei Institutes of Physical Science of the Chinese Academy of Sciences [YZJJ201502]
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Iron deficiency is a worldwide problem in modern agriculture, which causes leaf chlorosis and severe declines in crop yield. Therefore, improving the utilization efficiency (UE) of ferrous fertilizer is an urgent need. This study developed a pH-controlled-release ferrous foliar fertilizer (PCRFFF) composed of ferrous sulfate (FeSO4-7H(2)O), micro crystalline cellulose (MC), and attapulgite (ATP). Therein, MC was oxidized to form carboxyl cellulose (CC) that possessed plenty of carboxyl groups (-COOE) on the surface and could effectively chelate Fe2+ [Fe(II)] to form CC Fe(II) micro fibers. Then the CC Fe(II) microfibers were tightly coated by abundant ATP nanorods through hydrogen bonds to produce PCRFFF. Under acidic conditions, the chelated Fe(II) became isolated and the ATP coating became loose, which facilitated the release of Fe(II) from PCRFFF. Thus, the release of Fe(II) could be efficiently controlled by pH. In addition, PCRFFF displayed high adhesion capacity on a crop leaf surface. This technology could effectively decrease the loss and improve the UE of Fe(II), thereby promoting the growth of crops.
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