The Ca, Mg, S, Mn and Cu contents in leaves ofCoffea canephora trees selected in 64 plots under a 4×4×2 NPK trial were determined after seven years of fertilizer application. It was observed that NPK applications increased Mn uptake, P application increased the uptake of Cu, Ca and S while application of N and K did not enhance the uptake of Cu, Mg, Ca and S. It was shown that as a result of NPK applications, Ca and Mg had become deficient in coffee leaves, which corroborates earlier findings based on soil analysis.
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Ojeniyi, S.O. Effect of long-term NPK application on secondary and micro nutrient contents ofCoffea canephora Pierre. Plant Soil 60, 477–480 (1981). https://doi.org/10.1007/BF02149644
- Leaf analysis
- Nutrient contents