43. The element absorbed both in cation and anion form is A.Sulphur B.Nitrogen C.Calcium D.Phosphorus
Answer: Option B Solution: Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium - NH4+) or an anion (nitrate - NO3-). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time.
