Vol. 11, Issue 9 (2022)

Author(s):
Kumar Gaurav, Omvati Verma, Subhash Chandra, SK Guru and Poonam Gautam

Abstract:
The field experiment was conducted to study the “Response of timely and late sown wheat (Triticum aestivum L.) in relation to different foliar applied nutrients, growth regulators and their spraying schedule on leaf area index, relative water content and canopy temperature” during 2020-21 and 2021-22 in Rabi season at G. B. Pant University of Agriculture and Technology, Pantnagar, Udham Singh Nagar, Uttarakhand. The experiment consisted of three factors i.e. two date of sowing, six foliar nutrition and two spraying schedule. The main plot consisted of date of sowing i.e. timely and late (Nov 23 and Dec 15) and sub-plot having two factors one foliar nutrition i.e. KCl @ 1%, ascorbic acid@ 10ppm, thiourea @ 400 ppm, cycocel @ 1000 ppm, salicylic acid @ 400ppm and salicylic acid @ 800 ppm and second is spraying schedule i.e. vegetative + anthesis and anthesis stage alone. The experiment was laid out in factorial RBD design with three replications. Canopy temperature and relative water content was recorded 15 days after anthesis whereas leaf area index was recorded at different growth stages. The study revealed that during both the years of investigation, timely sown crop recoded significantly higher leaf area index and relative water content compared to late sown crop. Canopy temperature of timely sown crop was significantly lower than late sown crop. .Foliar applied nutrition significantly increased leaf area index and relative water content than control treatment. Among foliar applied nutrients higher dose of foliar applied salicylic acid @ 800 ppm significantly increased leaf area index at 70 and 90 DAS of wheat crop and was at par with foliar applied KCl @ 1% treatment. Similarly application of salicylic acid @ 800 ppm significantly improved relative water content and was at par with KCl @ 1% and thiourea @ 400 ppm. Foliar application of thiourea @ 400 ppm, KCl @ 1% and salicylic acid @ 800 ppm treatments help to reduce canopy temperature significantly than rest of the other foliar applied chemicals during both the years. Spraying schedule of foliar nutrition did not significantly respond to leaf area index, relative water content and canopy temperature.