b'ChlorideThe plant requires very little chloride. It plays a role in photosynthesis, uptake of water into the cell and suppressing plant diseases.Deficiency symptomsField grown crops will not suffer from shortages.There is already enough chloride in the soil or in the fertilizers. Groundwater also contains chloride and chloride is deposited from the atmosphere by precipitation. In protected crops it is important that chloride is added with fertilizers, especially if rainwater or reverse osmosis water is used.Excess symptomsChloride accumulates in the leaves and is therefore toxic.The leaf margins of the older leaves and the tips turn yellow. If the chloride content in the plant becomes too high, this will lead to leaf drop. If the crop is irrigated with water with a high chloride content, damage to the leaves can occur.CalciumThe last main element is Calcium. This is mainly built into the cell wall and is therefore difficult to measure with plant juice analyses. Calcium is actively and passively absorbed by the tip of the hair roots. The rest of the hair root does not absorb calcium.In cultivation in the open ground, a shortage of calcium will rarely occur. A high pH of the soil or poor basic saturation of the soil particles can cause a calcium deficiency in field grown cultivation. 115'