Spray post emergence application of metribuzin 70% WP @100-200 g/acre and earthing up is to be done.
Proper development of tubers depends upon, aeration, moisture availability and proper soil temperature. Therefore, proper earthing up is necessary. Earthing should be done when the plants are 15-22 centimetres high. The ridges should be broad, loose and high enough to cover up tubers. If necessary, a second earthing may be done after two weeks of the first one. A mould board plough or ridger may be used for earthing up in large area.
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