For species of plants not tolerant to NA, Ca protects from toxicity of NA but not Cl. Calcium can decrease the effective pH by precipitating carbonates and also by forming a complex calcium salt with ammonium hydroxide which prevents ammonia loss to the atmosphere. Actually calcium improves the uptake of nitrogen by plant roots especially when the plants are young. Root Crops Gypsum can help keep clay particles from adhering to roots, bulbs and tubers of crops like potato, carrots, garlic and beets. In combination with water-soluble polymers, it is even more beneficial.
Earthworms can do the plowing for no-till agriculture.
References - 1. M.E. Sumner, W.P. Miller, M.P.W. Farina, M.A. Pavan, and M.V Fey, 1989. A review, pp. Aldrich, D.G., Jr., and W.R. Schoonoever. Gypsum and other sulfur materials for soil conditioning.