Table-3: Period for full and partial maturity of certain weeds when they can be harvested without loss of their seed vitality, (Gupta 1984).
Weeds species	Period of full maturity after flowering (Days)	Minimum maturity period after flowering (Days)
Anagallis arvensis	25	15
Argemone mexicana	50	35
Asphodelus tenuifolius	40	15
Lathyrus aphaca	35	15
Melilotus indica	35	20
Solanum nigrum	45	15
Vicia hirsuta	30	15