Response of bioregulators and irrigation on plant height of Indian mustard (Brassica juncea L.)

Abstract

The field experiment was carried out during the 2014-15 and 2015-16 in Rabi season to evaluate the response of
bioregulators and irrigation on growth parameters of Indian mustard (Brassica juncea L.). The treatments consisted
three irrigation levels (no irrigation, one irrigation and two irrigation) and seven foliar spray of bioregulators (control
(water spray), thiourea @1000ppm, thiourea @ 500ppm, salicylic acid @ 100ppm, salicylic acid @ 50ppm, glycinebetaine
@ 100ppm and glycinebetaine @ 50ppm). The result indicated that in the irrigated plots significantly improved the plant
height of Indian mustard. The application of two irrigation recorded highest plant height at 80 DAS (132.7, 119.9 and
126.3 cm), 100DAS (173.6, 168.5 and 171.1 cm) and at harvest (176.4, 171.9 and 174.2 cm) followed by the application of
one irrigation in both years and pooled analysis, respectively. Moreover, the application of bioregulators significantly
improves the plant height of the Indian mustard. The application of thiourea @ 1000ppm gave highest plant height at 80
DAS (130.5, 118.2 and 124.4 cm), 100DAS (172.4, 166.8 and 169.6 cm) and at harvest (175.3, 170.9 and 173.1 cm). However,
the application of thiourea @ 500 ppm was statistically at par with thiourea @ 1000ppm in both years and pooled
analysis, respectively. Furthermore, combined result of bioregulators and irrigation levels were observed significant on
plant height of Indian mustard. The application of two irrigation+ foliar spray of thiourea @1000ppm recorded the
highest plant height at 100DAS (190.2, 182.3 and 186.3 cm) and at the time of harvest (194.2, 187.6 and 190.9 cm) over
control. The application of two irrigation+ foliar spray of thiourea @ 500ppm was statistically at par at 100 DAS (189.4,
181.6 and 185.5 cm) and at harvest (193.3, 186.7 and 190.0 cm) with two irrigation+ foliar spray of thiourea @1000ppm in
both years and pooled analysis, respectively. The present study highlighted the practical importance of the irrigation
levels and foliar spray of bioregulators combination response on plant height of Indian mustard.