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161
New program to boost crop yield, lower fertilizer costs
Argitaratua izan da Manila Times (1997)Artikulua -
162
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163
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164
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165
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166
Upland corn yields in a contour hedgerow system a production function approach
Argitaratua 1996Liburua -
167
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168
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169
Secondary crops in primary functions the search for systems, synergy, and sustainability
Argitaratua 1995Liburua -
170
