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  • WEEDS are the plants, which grow where they are not wanted. They grow in thefields where they compete with crops for water, soil nutrients, light and space and thus reduce crop yields.
  • The controlling of weeds in the growing crops with weedicides increases their yields and ensures the efficient use of irrigation,fertilizers and plant-protection measures, such as the spraying of insecticides and fungicides.
  • Both the nature of the weeds and that of the crops which they infest, influence the action of the weedicides. For example, the same types of weeds occur in maize and cotton which are kharif crops. 2,4-D can be used for killing the weeds in maize, but this weedicide should never be used on cotton which is highly sensitive to it.
  • A series of field trials were conducted to evaluate the effect of newly introduced weedicide against broad leaved weeds of wheat crop at Adaptive Research Farm.
  • To manage the weeds in direct seeded rice, four weedicides were tested and compared their efficacy with handweeding. Among the weedicides Nominee 100SC (bispyribac sodium) and Sunstar Gold 60WG (Ethoxy sulfuron) proved as the best weedicides with 90.5 and 87.19% weed control respectively.
  • The on-line automated weedicide sprayer system was developed at Universiti Putra Malaysia to locate the existence and intensity of weeds in real-time environment and to spray the weedicides automatically and precisely.
  • To asses the effect of pre emergence weedicide on adsorption and desorption in inceptisol soil four pre emergence weedicide used viz., oxyfluorfen, alachlor, fluchloralin and pendimethalin, in different concentration.
  • Some of the weedicide effect can be lost over the winter months and can offer less weed control in the first summer when compared with Post-planting applications in the spring.

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