vendse 31. Farmers in a particular region were concerned pre-mature yellowing of leaves of a pulse crop min cause decrease in the yield. Which treatment coul be most beneficial to obtain maximum seed yield? [AIPMT (Prelims)-2006) (1) Application of iron and magnesium to promote synthesis of chlorophyll (2) Frequent irrigation of the crop (3) Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer (4) Removal of all yellow leaves and spraying the remaining green leaves with 2.4 5-trichlorophenoxy acetic acid insects is