Response of Giza 90 Cotton Cultivar to Foliar Application of Some Drought Tolerance Inducers Under Water Stress and High Temperature Condations in Upper Egypt

Abstract

Two field experiments were carried out in El-Mattana Agric. Res. St., Agric. Res. Cent., Luxor Governorate, Egypt during 2010 and 2011 seasons to study the response of Giza 90 cotton cultivar to the application of some drought tolerance inducers to increase the tolerance of cotton plants to drought under high temperature condations in Upper Egypt. The experimental design was a split plot with four replications. Main plots included two irrigation intervals (15 and 21 days) and sub plot included the foliar application of four drought tolerance i.e CaBoron, Pix, Humex and Methanol) and a control (untreated plants), The obtained results could be summarized as follows: Irrigation every 15 day significantly increased plant height, no. of fruiting branches/plant, no. of days to first flower and first open boll. Prolonging irrigation interval to 21 day significantly decreased no. of open bolls /plant, boll weight, seed index, seed cotton yield/fed., fiber length, uniformity index and fiber strength, but lint % was significantly increased. All drought tolerance inducers significantly increased plant height, number of fruiting branches and open bolls/plant, boll weight, seed index, seed cotton yield /fed., earliness %, fiber length, uniformity index and fiber strength as compared with the untreated plants. In general, plants which were sprayed with methanol gave the highest averages of growth, yield and its components and earliness %, followed by plants which were sprayed with CaBoron, while the Pix sprayed plants came the last in this respect in both seasons. Well watered plants every 15 day showed greater response to Methanol than to any other drought tolerance inducer, while the plants irrigated every 21 day and treated with pix gave the lowest average in this respect. The interaction between studied factors had a significant effect on fiber strength in both seasons and upper half mean length in the first season only. Finally it could be concluded from this study that the CaBoron, Humex, Pix and Methanol applications to plants under normal and water stress conditions could induce drought tolerance of cotton plants and in turn improved plant growth, fruiting and yield particularly under water stress and high temperature conditions.

Effect of Foliar Application of Etherel and Combination of Some Micro-Nutreints on Productivity of Egyptian Cotton Plant

“…A deficiency of B can also affect fiber quality presumably because of the role of B in cell wall growth. Similar results were obtained by Faris and Rokkedh (2008) and Hamoda (2012) found that elongation of cotton fiber required the presence of B. On the other hand, a decrease in fiber length and micronaire was reported for plants not receiving adequate B.…”

Effect of Seed Soaking and Foliar Spray of Humic Acid and Fulvic Acid on Cotton Plant Pests and Yield, Compared with Some Recommended Pesticides

“…Temz et al (2009) found that different humic acid treatments (seed soaking, foliar spray, seed soaking + foliar spray) insignificantly affected seed cotton yield as compared with the untreated control application of humic acid. However, Hamoda (2012) found that lint % was insignificantly effected by the humex treatments. The tallest cotton plants were produced due to foliar spraying of humex 5 cm 3 /L three times, while the shortest plants were produced from untreated plants (control treatment) in both seasons of study.…”

The Physiological Response of Some Cotton Cultivars to Water Stress and Growth Inducers

“…More et al (2018) revealed the positive effects of spraying with B on growth, fruit retention, and yield components of cotton. Kassem et al (2009), Hamoda (2012), and Karademir & Karadmir (2020) illustrated that foliar application of B gives the highest values in leaves content of N, P, K, Mg, B, Fe, Mn, and Zn and significantly increases the seed cotton yield compared to control. Mixed Ca-B is essential for pollen grain germination and pollen tube elongation by helping in successful fertilization or pollination and banning the abortion of flowers.…”

“…Drought conditions cause oxidative stress in cells due to a higher leakage of electrons toward O 2 during photosynthetic processes and an increase in reactive oxygen species (ROS) production (Ali & Ullah, 2020). Hamoda (2012) pointed out that irrigation interval every 3 weeks cause a significant reduction in plant height, number of fruiting branches, number of open bolls/plant and seed cotton yield. Emara et al (2015) and Gomaa et al (2019) demonstrated that drought conditions during plant growth and fruit retention are due to a significant reduction in cotton yield and fiber quality properties.…”

“…ABA biosynthesis improves water use efficiency and increases plant drought stress tolerance . Hamoda (2012) and Naeem et al (2018) stated that Ca foliar application enhances the drought tolerance of plants. Fan (2019) and Abbas et al (2021) suggested that Ca foliar application improves growth and yield under normal and drought conditions.…”