Effect of post-emergence herbicides on yield of &lt;em&gt;Kharif&lt;/em&gt; groundnut

P V Mahatale,M Y Ladole,S N Deshmukh,E R Vaidaya

doi:10.4038/sljfa.v2i2.30

Effect of post-emergence herbicides on yield of <em>Kharif</em> groundnut

P V Mahatale, M Y Ladole + Show 2 more

Open Access

https://doi.org/10.4038/sljfa.v2i2.30

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Abstract

A field experiment was conducted to investigate the most appropriate post -emergence herbicides for the maximum weed control and yield enhancement in groundnut (Arachis hypogaea L.). The experiment in a RCBD with three replicates was conducted during Kharif season (June to October) 2013 and 2014 at the Oilseeds Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola (M.S.), India. The crop variety AK 159 was sown at a spacing of 30 cm (between rows) x 10 cm (within row). Nine treatments including six post-emergence herbicides applied at 2-4 leaf stage of weeds, a pre-emergence herbicide, and a weedy and weed-free (hand weeding) control. The recommended mixture of fertilizer 25:50 N, and P (kg/ha) was applied as a basal dressing using Urea (46 % N) and SSP (16% P2O5), respectively. Among the herbicidal treatments, the lowest weed index (3.26%) was observed under post-emergence herbicides Propaquizafop 10 EC (100 g/ha) followed Quizalofop ethyl 5 EC (100 g/ha) with a weed index of 9.74%. The minimum weed dry weight was also recorded in these treatments, which was significantly lower (p<0.05) than all other treatments. The lowest weed control efficiency (81.6%) was recorded in plots with the pre-emergence application of Pendimethalin 30 EC (1000 g/ha). The highest dry pods yield (2,927 kg/ha) was recorded in the weed free control (hand weeding 20 and 40 Days after emergence) and the lowest (1,520 kg/ha) was under un-weeded control. The post-emergence herbicides Propaquizafop 10 EC (100 g/ha) recorded the highest gross and net monetary returns, which were at par (p>0.05) with Quizalofop ethyl 5 EC (100 g/ha) but significantly higher (p<0.05) as compared to other herbicidal treatments. Application of post--herbicides effectively controlled weeds, and resulted in a considerably lower cost of cultivation compared with hand weeding. The benefit:cost ratio was the highest with post emergence herbicides Propaquizafop 10 EC (100 g/ha) followed by Quizalofop ethyl 5 EC (100 g/ha) compared to other treatments.

Highlights

Groundnut (Arachis hypogaea L.) is grown mainly in the Kharif season (June-October) in India
Groundnut (Arachis hypogeae L.) variety AK 159 was sown at a spacing of 30 cm x 10 cm in a randomized complete block design (RCBD) with three replicates having nine treatments namely, T1: Weeded check, T2: Weed-free check (Clean plot), T3: Propaquizafop 10 EC (100 g a.i./ha), T4: Quizalofop ethyl 5 EC (50 g a.i./ha), T5: Quizalofop ethyl 5 EC (100 g a.i./ha), T6: Imazethapyr 10% SL (50 g a.i./ha), T7: Imazethapyr 10% SL (100 g a.i./ha), T8: Imazethapyr+Imazamox 70% WG (100 g a.i./ha) and T9: Pendimethalin 30 EC (1000 g a.i./ha)
The treatments T3-T8 were post-emergence herbicides applied at 25-30 days after crop emergence (DACE), where the weeds were at 2-4 leaf stage

Summary

Introduction

Groundnut (Arachis hypogaea L.) is grown mainly in the Kharif season (June-October) in India. The post-emergence application of Imazethapyr 10% SL (100 g a.i./ha), Imazethapyr+Imazamox 70% WG (100 g a.I./ha) and Quizalofop ethyl 5 EC (50 g a.i./ha), and the pre-emergence application of Pendimethalin 30 EC (1000 g a.i./ha) and the un-weeded check showed similar WIs (p>0.05) and were significantly higher (p

Results

Conclusion