Author(s):

Amit Kumar, AK Dhaka, Satish Kumar, Samunder Singh and SS Punia

Abstract: An experiment was conducted to study the efficacy of imidazolinones alone and in combination against weeds in pigeon pea at Agronomy Research Farm, CCS Haryana Agricultural University, Hisar, India having 18 treatment combinations viz.,T₁- Imazethapyr at 75 g ha^-1 as PRE, T₂- Imazethapyr at 100 g ha^-1 as PRE, T₃- Imazethapyr at 75 g ha^-1 at 45 DAS, T₄- Imazethapyr at 100 g ha^-1 at 45 DAS, T₅- Imazethapyr + imazamox at 70 g ha^-1 as PRE, T₆- Imazethapyr + imazamox at 100 g ha^-1 as PRE, T₇- Imazethapyr + imazamox at 70 g ha^-1 at 45 DAS, T₈- Imazethapyr + imazamox at 100 g ha^-1 at 45 DAS, T₉- Pendimethalin + imazethapyr at 750 + 50 g ha^-1 as PRE, T₁₀- Pendimethalin + imazethapyr at 1000 + 50 g ha^-1 as PRE, T₁₁- Pendimethalin + imazethapyr at 750 + 65 g ha^-1 as PRE, T₁₂- Pendimethalin + imazethapyr at 1000 + 65 g ha^-1 as PRE, T₁₃- Pendimethalin + imazethapyr at 750 +75 g ha^-1 as PRE, T₁₄- Pendimethalin + imazethapyr at 1000 + 75 g ha^-1 as PRE, T₁₅- Pendimethalin at 1000 g ha^-1 as PRE, T₁₆- Weed free, T₁₇- Weedy check and T₁₈- Two hoeing at 40 & 70 DAS, replicated thrice in randomized block design during growing seasons of 2017 and 2018.Weed indices were calculated which advocated that all the chemical weed control treatments significantly reduced the weed infestation over weedy check. Treatment T₁₃ and T₁₄ gave statistically at par grain yield of pigeon pea as in weed free condition which may be due to higher accumulation of growth and yield attributes of pigeon pea due to lower weed-crop competition.

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