. A shortest time span in the life cycle of a crop when weeding results in highest eco nomic returns a). Economic threshold b). Critical period c). Competitive threshold d). None of these

. A shortest time span in the life cycle of a  crop when weeding results in highest eco nomic returns
a). Economic threshold
b). Critical period
c). Competitive threshold
d). None of these
by

1 Answer

Answer :

b). Critical period
by

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