Integrated use of Herbicides and different Fertility Levels in Suppressing the Weed Species in Indian Mustard (Brassica juncea)

Author: Shweta Gupta, Sudesh Kumar, Seema Sharma, Pratibha Singh and Manisha Jangir

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Abstract

A field experiment was conducted at research farm, Rajasthan Agricultural Research Institute, Durgapura, Jaipur for 2 consecutive years during rabi seasons 2014-15 and 2015-16 on loamy sand soil. The twenty-four treatment combinations consisting of 3 fertility levels {100% RDF; 100% RDF + K + Zn and 125% (RDF + K + Zn)} and 8 herbicidal treatments (Weedy check, weed free, pendimethalin 30 EC, pendimethalin 38.7 CS, pyrazosulfuron-ethyl 10 WP, oxydiargyl 6 EC, propaquizafop 10% EC and fluazifop-p-butyl 13.4% EC) were tested in mustard in factorial randomized block design with 3 replications. Chenopodium album, Argemone maxicana, Portulaca oleraceae, Tithonia diversifolia, and Heliotropium ovalifolium among the broadleaved weeds, Cyperus rotundus among the sedges and Cynodon dactylon among the grasses were predominant throughout the cropping period of mustard. Results showed that weed density of most of the broad-leaved weeds and total dry weight was most effectively controlled by pendimethalin 38.7 CS @ 750g a.i./ha, followed by pendimethalin 30 EC @ 750 g a.i./ha and oxydiargyl 6 EC pre-emergence @ 90 g a.i./ha whereas propaquizafop 10% EC @ 100 g a.i./ha (POE) and fluazifop-p-butyl 13.4 % EC @ 134 g a.i./ha (POE) significantly decreased the density of grassy weeds. Pyrazosulfuron-ethyl 10 WP as pre-emergence showed phytotoxic effect on the germination of mustard. Maximum siliqua length, siliquae per plant, seed and stover yield were obtained under weed free, which was found at par with pendimethalin 38.7 CS @ 750 g a.i./ha. The siliqua length, siliquae per plant, seed and stover yield were significantly higher in fertility level 125% (RDF + K + Zn) in mustard. Pendimethalin 38.7 CS combined with 125% (RDF + K + Zn) or 100% RDF + K + Zn and weed free along with 125% (RDF + K + Zn) were found at par with each other and most superior treatment combinations for obtaining higher seed yield in mustard. Thus, integrated use of 100% RDF + K + Zn with pendimethalin 38.7 CS @ 750g a.i./ha appeared to be the most promising approach for effective weed management and obtaining higher productivity of Indian mustard.

Keywords

Pendimethalin, oxydiargyl, propaquizafop, fluazifop-p-butyl, fertility levels, herbicides, siliqua, stover

Conclusion

On the basis of pooled data, it can be concluded that pre-emergence application of pendimethalin 38.7 CS @ 750g a.i./ha reduces the weed density and total dry weight of broadleaf weeds whereas propaquizafop 10% EC @ (POE) and fluazifop-p-butyl 13.4 % EC @ 134 g a.i./ha (POE) significantly decreased the density and total dry weight of grassy weeds in comparison to other herbicidal treatments. Weed free produced the maximum pooled seed yield and stover yield, followed by pendimethalin 38.7 CS pre-emergence @ 750 g a.i./ha treatment. Highest yield of mustard was obtained in weed free plots when fertilizer was given at the rate of 125% RDF + K + Zn, which was closely followed by the pendimethalin CS at the same dose of fertilizer. Combined application of Pendimethalin 38.7 CS + 100% RDF + K + Zn was found at par with the highest yield observed under weed free + 125% RDF + K + Zn and hence it is recommended in case of scarce labor condition.

References

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How to cite this article

Shweta Gupta, Sudesh Kumar, Seema Sharma, Pratibha Singh and Manisha Jangir (2023). Integrated use of Herbicides and Different Fertility Levels in Suppressing the Weed Species in Indian Mustard (Brassica juncea). Biological Forum – An International Journal, 15(2): 534-540.