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Because of the Green Revolution package of seds, fertilizer, and irrigation, national average rice yields doubled from about 1.5 t/ha in the late 1960s to 3.0 t/ha by 1990. Çó¸ßÊÖ·Òëһϣ¬ÓÈÆäÊÇpackageÔõôÒëºÃÄØ£¿ |
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