Effect of genotypes and foliar spray of methyl jasmonate and salicylic acid on andrographolide yield in Andrographis paniculata (Burm. f.) Wall. ex Nees. under semi-arid climate

Abstract

Weather parameters during the crop period revealed that there was evaporative demand of 22.6 mm and 23.4 mm in the crop year 2019 and 2020, respectively, during the stress period. Bright sunshine hours were 56.6 and 59.1 during the stress period in the crop years 2019 and 2020, respectively. The maximum temperature remained at 29.1 °C and 28.4 °C during the stress period in the crop year 2019 and 2020, respectively. The periodic measurement of soil moisture revealed that by stopping the irrigation, the soil moisture was depleted continuously and reached less than 6.0% in 50 days stress period (Fig. 1).