Indian Journal of Weed Science

Field experiments were conducted on fenugreek at Jobner (Rajasthan) during rabi 1982–83 and 1983–84 comprising twelve weed control treatments and two phosphorus levels. The results indicated that the nutrient (N and P) removal by weeds was enormous when compared to crop uptake at all the stages of crop growth. Herbicidal application as well as manual weeding treatments in general reduced the nutrient removal by weeds and enhanced the nutrient uptaks by the crop. However, amongst the herbicidal treatments pendimethalin 0.75 kg/ha and fluchloralin 1.0 kg/ha were found superior over the rest. The increased uptake of N and P by the crop ultimately reflected in higher grain yield of fenugreek. The crude protein content of grain was the highest in treatment pendimethalin 0.75 kg/ha but the difference was not significant with all other treatments. Application of phosphorus at 40 kg P₂O₅ ha⁻¹ significantly increased the nitrogen and phosphorus uptake by crop as well as by weeds. The grain yield was also increased significantly