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Phosphorus Availability and Release Pattern from Activated Dolomite Phosphate Rock in Central Florida Xiaoyun Mao, Qin Lu, Wei Mo, Xiaoping Xin, Xian Chen, and Zhenli He J. Agric. Food Chem., Just Accepted Manuscript • Publication Date (Web): 19 May 2017 Downloaded from http://pubs.acs.org on May 21, 2017
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Journal of Agricultural and Food Chemistry
Phosphorus Availability and Release Pattern from Activated Dolomite Phosphate Rock in Central Florida Xiaoyun Mao †, ‡, Qin Lu†, Wei Mo ‡, §, Xiaoping Xin‡, Xian Chen†，Zhenli He‡* † College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China ‡ Department of Soil and Water Sciences, Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34945-3138, USA § College of Resources and Metallurgy, Guangxi University, 100 Daxue Road, Nanning 530004, China
*Zhenli He (Corresponding author) Department of Soil and Water Science, Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34945-3138, USA Tel.: +1-772-577-7353 E-mail:
[email protected] ACS Paragon Plus Environment
Journal of Agricultural and Food Chemistry
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ABSTRACT: In this study, novel technology was developed to convert dolomite
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phosphate rock (DPR) into slow release P fertilizers. The DPR was powdered to < 100
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mesh and activated with organic molecules under optimal reaction conditions. As
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compared to original DPR, available P, estimated by water soluble P released from the
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three DPRs activated with three types of organic molecules, increased by 6.86, 3.32,
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and 7.46 times, respectively. Phosphorus supply from the activated DPRs was greater
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than that of superphosphates (SP). Use of activated DPRs resulted in a significant
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increase in plant biomass of maize (Zea mays) and millet (Pennisetum glaucum)
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(succeeding crop), as compared to original DPR, and displayed better effectiveness
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than mono-ammonium phosphate or SP. The XRD and FTIR analyses showed that
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activation did not change the crystal structure of DPR, but the interactions between
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organic molecules and the P-bearing minerals stimulated P release from DPR.
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KEYWORDS: activation, agronomic effectiveness, dolomite phosphate rock, plant
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growth, slow release fertilizers, water soluble phosphorus
ACS Paragon Plus Environment
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Journal of Agricultural and Food Chemistry
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■ INTRODUCTION
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Worldwide approximately 80% of phosphate rocks (PRs) are mined for phosphate (P)
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fertilizer production.1 Phosphate rock resources have played a significant role in the
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sustainable development of agriculture.2, 3 To date, high-grade PRs (＞13% P and
