Stikstofomsettinge in gronde met spesiale verwysing na lupine as bron van stikstof vir boorde en wingerde by Fourie, S.

Subjects: “…Fruit -- Fertilizers…”
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Yield and fruit quality of citrus species relative to foliar sprays of macronutrients by Mudau, N. Fhatuwani (Nixwell Fhatuwani)

Subjects: “…Citrus fruits -- Fertilizers…”
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Plant analysis as a method of diagnosing fertilizer requirements of citrus, with special reference to the Valencia variety by Bathurst, A. C

Subjects: “…Citrus fruits -- Fertilizers -- South Africa…”
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