What element does lime furnish that is considered one of the most important macro food elements in plants?

Lime, primarily composed of calcium carbonate, delivers calcium to the soil when applied. Calcium is classified as one of the essential macronutrients for plants, playing a crucial role in various physiological processes. It is vital for cell wall structure and stability, contributing to the overall integrity of plant cells. Calcium also aids in nutrient uptake and transport within the plant, enhances soil structure, and promotes root development.

Additionally, calcium is significant for the activation of certain enzymes and is involved in the regulation of other nutrients. Its importance in preventing disorders like blossom end rot in tomatoes and tip burn in lettuce highlights its role in maintaining healthy plant growth. Therefore, among the choices provided, the element that lime furnishes and is a key macronutrient is calcium.