RESPONSE OF WHEAT (TRITICUM-AESTIVUM) VARIETIES TO WEED MANAGEMENT UNDER LATE-SOWN CONDITION ON CALCAREOUS SOIL OF NORTH BIHAR

A field experiment was conducted during 1990-91 and 1991-92 to study t he response of wheat (Triticum aestivum L. emend. Fiori & Paol.) varie ties to weed management at Pusa. All the weed-management practices gav e significant control of weeds and higher grain yield than weedy check . Among the weed-management practices, hand-weeding recorded the maxim um grain yield and was significantly superior to all other treatments. Although higher dose of isoproturon (2.0 kg ai/ha) recorded the highe st weed-control efficiency, it had an adverse effect on crop growth an d reduced the grain yields. All the wheat varieties performed equally in respect of grain and straw yields except 'HP 1102'. Application of isoproturon beyond the rate of 1.0 kg ai/ha was not found desirable.