Dry Matter Partitioning and Productivity of Wheat (Triticum aestivum L.) as Influenced by Sowing Thermal Regimes and Bio-regulators
Hansa Lakhran *
Department of Agronomy, S. K. N. College of Agriculture, S. K. N. Agriculture University, Jobner, Jaipur, Rajasthan 303329, India.
O. P. Sharma
Department of Agronomy, S. K. N. College of Agriculture, S. K. N. Agriculture University, Jobner, Jaipur, Rajasthan 303329, India.
Rohitash Bajiya
Department of Agronomy, S. K. N. College of Agriculture, S. K. N. Agriculture University, Jobner, Jaipur, Rajasthan 303329, India.
H. P. Verma
Department of Agronomy, S. K. N. College of Agriculture, S. K. N. Agriculture University, Jobner, Jaipur, Rajasthan 303329, India.
Meena Choudhary
Department of Agronomy, S. K. N. College of Agriculture, S. K. N. Agriculture University, Jobner, Jaipur, Rajasthan 303329, India.
*Author to whom correspondence should be addressed.
Abstract
A field experiment was carried out during the rabi seasons of 2016-17 and 2017-18 at Agronomy Farm, S.K.N. Agriculture University, Jobner, Jaipur, Rajasthan, to evaluate the effect of sowing at different thermal regimes and foliar sprays of bio-regulators on growth and yield of wheat. The treatments comprised three sowings (22ºC, 20ºC and 18ºC) and eight bio-regulators (control, water spray, SA @ 100 ppm, SA @ 200 ppm, TSA @ 100 ppm, TSA @ 200 ppm, TGA @ 100 ppm and TGA @ 200 ppm). The experiment was conducted in split plot design with 4 replications. Wheat sown at 20ºC showed superior performance in respect of dry-matter partitioning and yield parameters, i.e. grain, straw biological and yields as compared to sowing at 22ºC and 18ºC. Amongst the bio-regulators options, an application of SA @ 200 ppm resulted in better performance, being comparable with those of TSA @ 200 ppm and TGA @ 200 ppm. Crop sown at 20ºC along with SA @ 200 ppm was found to be a better option for maximum dry matter accumulation and productivity of wheat under heat stress.
Keywords: Bio-regulators, dry matter partitioning, sowing temperature, wheat, yield.