Efficacy of different herbicides in sunflower under South Gujarat condition.

The present experiment was carried out at College farm, N. M. College of Agriculture, Navsari Agricultural University, Navsari. During the year 2011–2012, to investigate the Weed management in sunflower (Helianthus annuus L.) under South Gujarat condition. Ten treatments comprising combination of pre-(Pendimethalin & Alachlor) and post-emergence (Quizalofop-ethyl & Imazethapyr) herbicides including weed free and weedy check were tested in randomized block design with three replications. Pre-mergence application of Pendimethalin either 1.0 kg ha−1 or Alachlor 1.0 kg ha−1 were found effective to control different weed species. Hand weeding & IC at 20 and 40 DAS weed free condition was proved effective against all weed species. Being equivalent to hand weeding & IC at 20 and 40 DAS, maximum seed and stover yields of sunflower were recorded under pre-emergence application of Pendimethalin @ 1 kg ha−1 pre-emergence + hand weeding at 20 and 40 DAS. Similarly, tend was found in yield attributes parameter viz., number of seed per head, seed weight per head, 100-seed weight and quality of protein yield. and also nutrient content & uptake was recorded by crop. Application Alachlor @ 1 kg ha−1 pre-emergence + hand weeding at 20 and 40 DAS and Alachlor @ 1 kg ha−1 preemergence reflected in higher B:C ratio of 4.16 and 3.85, respectively.