Effect of plant growth regulators and irrigation levels on growth, physiological parameters and yield of Indian mustard

Abstract

 A field experiment was conducted during 2020-21 to assess the effects of plant growth regulators and irrigation levels on 
growth, yield attributes and yield of Indian mustard. There were three irrigation levels in main plots viz., no irrigation, 
one irrigation at 40 days after sowing (DAS) and two irrigations (at 40 and 75 DAS) with six treatments viz., control, 
naphthalene acetic acid (NAA) @ 100 ppm, gibberellic acid @ 50 ppm, salicylic acid @ 100 ppm, thiourea @ 0.1%, 
indole acetic acid @ 50 ppm applied at 30 and 60 DAS were allotted to sub-plots. Results revealed that maximum growth 
parameters including plant height, number of leaves/plant, number of branches and physiological parameters like SPAD 
reading, leaf area index were found under the application of two irrigations with salicylic acid. Further, yield and its 
attributes like test weight, stem girth, number of primary and secondary branches, seed and stover yield, biological yield 
and harvest index were found highest in salicylic acid with two irrigations. Thus, it can be concluded that application of 
two irrigations with use of salicylic acid could be benecial for getting higher productivity of Indian mustard under semi
arid region of Rajasthan.