Bilaketaren emaitzak - "Potassium fertilizers"
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Nutrient composition and growth of pine-apple and coconut intercrops as influenced by nitrogen, phosphorus and potasium [microform].
Argitaratua 1980Visual Material -
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The influence of nitrogen-potassium ration and moisture regime on juice quality and NPK composition of Phil 56226 [microform]
Argitaratua 1977Visual Material