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30 Novembro 1982
Egito, Nigéria, Iraque, Austrália, Gana, Congo, Serra Leoa, Camarões, Nova Zelândia, Ruanda, Filipinas, África do Sul, Vietnam, Japão, Madagáscar, Tanzania, Índia, Romênia, Brasil, Cuba
In view of the continuing increase in cost and scarcity of mineral fertilizers resulting from the use of high-cost fossil energy, there is renewed interest in organic recycling and biological nitrogen-fixation to improve soil fertility and productivity.
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