Effect of nitrogen levels and Mepiquat chloride on plant height of Bt cotton (Gossypium hirsutum L.)

Abstract

The field experiment was conducted at National Seed Production area of CCS Haryana Agricultural University, Hisar, during kharif 2018. The experiment comprised of three levels of nitrogen (100%, 125% and 150% RDN) and three spray of mepiquat chloride (control, single spray at 60 DAS and two sprays at 60 and 75 DAS) was conducted in factorial randomized complete block design with three replication. Results reveal that plant height was statistically higher with 150% RDN, while with mepiquat chloride spray it was significantly higher in control. Highest plant height recorded at harvest with 150% RDN (154.78, 154.58 and 144.09 cm) followed by 125% and 100% RDN respectively. However application of mepiquat chloride reduces the plant height. Double spray of mepiquat chloride @ 20g a.i. per ha at 60 and 75 DAS significantly reduced plant height (114.66, 210.89 and 128.4 cm) compare to control, while it at par with single spray at 60 DAS respectively. The present study highlighted the practical importance of the different nitrogen levels and mepiquat chloride spray on plant height of Bt cotton.