Characteristics and preparation of oil-coated fertilizers: A review

As the slow-release fertilizer, oil-coated fertilizer can not only slow down the nutrients loss, but also have outstanding advantages in controlling the nutrients release. Based on a large number of literature, this paper systematically investigated the composition, classification, properties and pr...

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Bibliographic Details
Published in:Journal of controlled release 2022-05, Vol.345, p.675-684
Main Authors: Yuan, Shengnan, Cheng, Long, Tan, Zhongxin
Format: Article
Language:English
Subjects:
Bio-based polyurethane
Fertilizers - analysis
Nitrogen
Nitrogen element
Oil-coated fertilizer
Polyurethanes
Preparation
Slow release
Urea
Water
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Summary:As the slow-release fertilizer, oil-coated fertilizer can not only slow down the nutrients loss, but also have outstanding advantages in controlling the nutrients release. Based on a large number of literature, this paper systematically investigated the composition, classification, properties and preparation of oil-coated fertilizers, summarizes the challenges faced by the oil-coated fertilizers and offers a few suggestions for the future research. Through literature research, some important conclusions were found: (1) Oil-coated fertilizers are generally composed of core fertilizers and coated oil layers, and some have active interlayers. (2) Vegetable oils has the characteristics of easy degradation, water resistance and impact resistance, and the nutrient release curves of vegetable oil coated fertilizer in soil and still water are “S” type. (3) The modified polyurethane exhibits good compatibility with urea, and can control the release of N in a long period of time, which is 30 days longer than the N release life of ordinary polyurethane-coated fertilizers. (4) Oil-coated fertilizers can reduce the loss of N by slowing down the hydrolysis rate of urea and the nitrification from NH4+ to NO3−, which reduces the N2O release by 70–80% compared to the uncoated fertilizers. Moreover, the paper also proposes a new preparation method of oil-coated material. [Display omitted] •The nutrient release of oil-coated fertilizer presents the “diffusion” mechanism.•Production costs and environmental risks are challenges for oil-coated fertilizers.•Temperature is the most important external factor affecting the nutrients release.•Bio-based polyurethane materials can replace petroleum-based polymers.
ISSN:0168-3659
1873-4995
DOI:10.1016/j.jconrel.2022.03.040