A) Frequent irrigation of the crop
B) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
C) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid
D) Application of iron and magnesium to promote synthesis of chlorophyll
Correct Answer: D
Solution :
If a pulse crop possesses premature yellowing of leaves and decrease in yield then application of magnesium and iron to promote synthesis of chlorophyll may become most beneficial to overcome the problem and to obtain maximum seed yield. Magnesium is an imponant part of ring structure of chlorophyll molecule and its deficiency causes chlorosis and premature I leaf abscission. In iron deficiency also, the leaves become chlorotic because iron is required for the synthesis of some of the chlorophyll protein complexes in the chloroplast.
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