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. 2019 Jun 7;6:81. doi: 10.3389/fnut.2019.00081

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Copyright © 2019 Palanog, Calayugan, Descalsota-Empleo, Amparado, Inabangan-Asilo, Arocena, Sta. Cruz, Borromeo, Lalusin, Hernandez, Acuin, Reinke and Swamy.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Micronutrient concentrations of major rice paddies in the Philippines (24, 25) in various regions in the country, with each bar representing different sample sites (provinces), showing deficiency in Zn based on (a) Canadian soil guidelines for agricultural soils and (b) Netherlands target values for soils. The concentration of nutrients is measured in ppm. Provinces in each region include Cagayan (Cagayan and Isabela), Central Luzon (Nueva Ecija, Tarlac, Bulacan, Pangasinan, and Zambales), Southern Luzon (Laguna), Bicol Region (Camarines Sur, Albay, and Sorsogon), Western Visayas (Iloilo and Negros Occidental), and Mindanao (Maguindanao, North Cotabato, and Sultan Kudarat).