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  GroveStudies Production Agronomy :-  Contents ;- Weeds classification  Loss and gain of weeds  Weed Contents  Water use efficiency Herbicides  Advantages and disadvantage  Growth and development Irrigation And different methods  Drip and Sprinkler ----------------------------------------------- What is Weed?  Weeds may be defined as the unwanted and undesirable plant which interfere with the utilisation of land and water resources and adversely affect human welfare the term Veda was firstly used by Jethro Tull. According to their economic importance of weeds :-  Relative weeds :-  unwanted plant which has some economic importance but called weeds because these are grown out of their places.  Example:- cynodon dactylon. Absolute weeds :-  unwanted plant which has no economic value and growing out of their proper place.   Ex :- euphorbia hirta. Losses caused by weeds :-  Weeds compete with the crop for their growth factors :-  The greatest loss caused by the wheat resulted from their