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Calcium is one of the most important plant nutrients. It is essential for building a strong cell membrane structure, and plays important roles in Nitrogen metabolism, protein formation and black carrera sunglasses Potassium uptake. Calcium deficiencies are typically noted in the growth zones such as new top and root growth, and at the bottom end of fruits. Blossom End Rot (BER) in peppers and tomatoes is an excellent example of how weakened cell membranes reduce fruit quality and economic performance.
While the information is there, it is surprising how uninformed we are about Calcium nutrition. Although we have a practical understanding of its role as a soil amendment, eliminating Calcium deficiency in California agriculture can be challenging. Supplying the crop's need for Calcium is not as simple roberto cavalli sunglasses as calculating the soil's lime requirements. Nutrient availability is dependent upon many factors beyond total supply such as pH, C.E.C., cation saturation on the CEC, water availability and quality to name a few.
There are two factors that may influence Calcium.

Ca/Mg ratio: Calcium availability may be limited by excess Magnesium. Calcium is located directly designer sunglasses on sale under Magnesium in the periodic table of elements describing "similar" electro-chemical characteristics, which play a part in the cation exchange dynamics occurring at the interchange sites in the root zone. I personally believe that there is no magical number for Ca/Mg ratio, but that the grower should pay attention to the crop's performance and consider gucci sunglasses discount the total amount of Mg as a possible source of interference with Ca uptake. In this approach the laboratory-calculated fertilizer recommendations assume an advisory role, secondary the grower's experience in reading his crop's response.

Calcium is generally immobile once inside the plant. It moves up from the roots through the Xylem in the column of transpiration water moving up to the leaves, while very little moves down through the phloem. Because of this almost unidirectional flow, a steady supply of available Calcium is required to support cell integrity in new plant growth areas, such as shoots, roots and fruits.