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Fertilizer and their use: a pocket guide for extension officers,4th ed, 2000. :
: . . : :Food and Agriculture Organization of the United Nations : :International Fertilizer Industry Association : .
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Published by arrangement with the Food and Agriculture Organization of the United Nations
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Fertilizers and their use, Fourth edition
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IFA, 1992 . IFA .
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"World Fertilizer User Manual" , 1992, IFA, Paris, 632 p. Web site, http://www.fertilizer.org, also available in CD version.
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Fertilizer and their use Published by arrangement with the
Food and Agriculture Organization
of the United Nations
By the
Islamic Azad University,
Shiraz Branch