Hi
I'm looking for a guideline or a document for main nutrient imbalances for crops and their significance, such as P/Zn, P/Fe, P/Mn, S/P, Ca/Mg, K/Ca, K/Mg, K/Na, Fe/Mn, Fe/Zn, Na/Mg or Na/Ca, but also for nitrogen forms, etc with the optimum values and/or what deficiencies means each value.
Thanks in advance,
Andrés