Weed Control in Peanuts sown between Wheat Rows

Abstract

Weed Control methods, mainly post-emergence herbicides applied after wheat harvest were examined on the field of peanuts sown between wheat rows.
1) Trifluralin (granular) incorporated after wheat harvest achieved the good control of weeds at the rates of 0.75 and 1kg a. i./ha, but reduced significantly the bean yield.
2) Incorporated vernolate (granular) at the rate of 1.5kg a. i./ha was not so effective as trifluralin, though not reduced the bean yield.
3) To make clear the effect of herbicides on the pod development, peanuts were grown on the pots, and the granules of trifluralin (1kg/ha) or vernolate (2kg/ha) was incorporated to the upper 5cm of soil. In the case that trifluralin was treated at 30 days or less before the pegs put into soil, the development of peanuts was retarded remarkably. On the contrary, no effect was observed in any vernolate treatments.
4) Mixed herbicide of benthiocarb and prometryne (emulsion) was most effective as the pre-emergence treatment. It was confirmed that the treatment of this pre-emergence herbicide followed by vernolate incorporation after wheat harvest was the best combination of herbicides and much better than the conventional weeding method, combination of trifluralin and intertillage.