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Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

1. Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
2. Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid
3. Application of iron and magnesium to promote synthesis of chlorophyll
4. Frequent irrigation of the crop

Correct answer: Application of iron and magnesium to promote synthesis of chlorophyll

Solution

Premature yellowing usually reflects reduced chlorophyll, which lowers photosynthesis and seed filling. Iron and magnesium are key for chlorophyll synthesis, so supplying them can best restore leaf greenness and maximize yield.

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