Document Type : Research Paper

Authors

1 Department of Agronomy and Plant Breeding, Sabzevar Branch, Islamic Azad University, Sabzevar, Iran

2 Department of Agronomy and Plant Breeding, Sabzevar Branch, Islamic Azad University

Abstract

Nowadays, the use of stress modulators as a useful and low-cost solution to reduce the effects of environmental stress has been considered by researchers. In order to investigate the effects of stress modulator’s foliar application in different planting dates on yield and yield components of cotton, an experiment was conducted as split-plot factorial in a randomized complete block design with three replications in Sabzevar Islamic Azad University in 2017 and 2018. Factors were: planting date (early and late) as the main plot and type of stress modulator (control, salicylic acid (SA) 2 and 4 mM, glycine betaine (GB) 50 and 100 mM and sodium nitroprusside (SNP) 100 and 200 μM) in the sub-plots. Foliar application of 2 mM SA in the first year and 4mM SA in the second year produced the highest number of bolls per plant (10.1 and 7.58, respectively). While 4 mM SA spraying in early planting date increased the seed cotton yield (45.6 percent), but in late planting date, seed cotton yield did not respond to the stress modulator application. In the first year, 100 μM SNP foliar application had the highest lint yield in both early and late planting date, but in the second year, 2 mM SA foliar application produced higher lint yields. Overall, the results of this experiment showed that the highest yield of cotton in saline conditions was obtained in sowing at the appropriate date and foliar application of 4 mM salicylic acid.

Keywords