DENDROLOGY

Detailed explanation-1: -Iron and magnesium are essential for the synthesis of chlorophyll of plants.

Detailed explanation-2: -Without nitrates, the amount of chlorophyll in leaves reduces. This means leaves turn a pale green or yellow colour. This reduces the plant’s ability to photosynthesise and grow properly, which reduces the farmers’ crop yield .

Detailed explanation-3: -Nitrogen is necessary for chlorophyll synthesis and, as a part of chlorophyll molecules, is involved in photosynthesis. Nitrate is very mobile in the soil and moves with soil water to root surfaces for plant absorption.

Detailed explanation-4: -Iron (Fe) is essential for chlorophyll synthesis, which is why an iron deficiency results in chlorosis. Manganese (Mn) activates some important enzymes involved in chlorophyll formation. Manganese-deficient plants will develop chlorosis between the veins of its leaves.