Response of maize and black gram yield and water productivity to variation in canopy temperature and crop water stress index

Abstract

In order to evaluate the ability of the crop water stress index to estimate grain yield and water productivity of maize and black gram in the climatic conditions of Urmia (Iran), research was conducted under the conditions of single-row drip irrigation. This study was conducted in a randomized complete block design with four irrigation levels including 50 (I 1), 75 (I 2), 100 (I 3) and 125 (I 4) percent of the water requirements of the plants with three replications. The mean crop water stress index values for the I 1 , I 2 and I 3 treatments were 0.53, 0.44, and 0.28, respectively during the growth period of maize, and 0.37, 0.23, and 0.15 for black gram, respectively. In the present study, the correlation between the crop water stress index and the grain yield and also the water productivity of maize and black gram was high. According to the results, the highest grain yield for maize and black gram was obtained at crop water stress index values of 0.28 and 0.15, respectively. Therefore, these values are recommended for the irrigation scheduling of the plants. It should be noted that the maximum water productivity index for maize and black gram was obtained at crop water stress index values of 0.44 (I 2) and 0.37 (I 1), respectively, which are the values recommended for irrigation scheduling under restricted access to water. K e y w o r d s: canopy temperature, crop yield, CWSI, phenolic and flavonoid compounds, water stress

Effect of water stress on yield stability, water productivity, and canopy temperature of rice genotypes

“…The GT-biplot analysis also showed that CT was negatively correlated with GMP, STI, MP, HM, WP, Yp, and Ys. Therefore, CT measurement should be introduced as a practical and immediate method to evaluate the drought tolerance of rice genotypes (Yan et al, 2012;Khorsand et al, 2020;Teymoori et al, 2020). Similar to the present study, Sharifi and Ebadi (2018) and Sabouri et al (2022) also used a GT-biplot analysis to identify superior rice genotypes under drought stress conditions.…”

“…Since the CT depends on the transpiration rate, water absorption capacity, and water productivity, a low CT indirectly indicates the high ability of roots to absorb (Yan et al, 2012). Also, since CT is correlated with crop RWC and yield, genotypes with a lower CT show an improved water potential and will have more tolerance to drought stress (Khorsand et al, 2020;Teymoori et al, 2020). 5.…”

“…Another method of identifying drought-tolerant genotypes is to use stress tolerance indices (such as TOL, STI, SSI, MP, GMP, HM, RSI, YI, and YSI) and to rank the genotypes based on them (Krishnamurthy et al, 2016;Mariey and Khedr, 2017). In addition, it is possible to identify drought-tolerant genotypes by evaluating their water productivity and canopy temperature (Khorsand et al, 2020;Teymoori et al, 2020).…”