I have an orchard of Citrus and Avocado Trees. I analyzed the soil and here are the results:
Texture of soil: Clay.
EC: 0.37 dS/m. Non-saline.
Phosphorus: 5.13 ppm. Low
Potassium: 190 mg/kg. Medium/Low
Calcium Carbonate: 25%. High.
I were advised to add Calcinit or Calcium Nitrate to the soil by irrigation. Is this a right action to do?
Do I really need to fertilize the soil with Calcinit knowing that the soil contains high percentage of calcium carbonate?
Outside United States soil and fertility issues
I can direct you to this resource for avocado production (look for the area dealing specifically with fertility): http://edis.ifas.ufl.edu/mg213. Use this one for citrus: http://edis.ifas.ufl.edu/hs132.
As for the question about calcium nitrate vs the calcium carbonate in your soil: The presence of calcium carbonate (lime) in the soil does not mean that the plant can get enough calcium. Calcium carbonate does not dissolve well in water. Calcium nitrate dissolves completely in water and is therefore readily available to plants. Heavy fruit bearing trees such as citrus and avocado require a lot of calcium. Particularly in drip or spring irrigation applications, calcium nitrate should be used alone and not in combination with sulfurous or phosphorous fertilizers.