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Research Articles
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Identification of sodicity-tolerant banana varieties to harness the salt-affected ecosystem
Dr. M. S. Swaminathan Agrl. Coll. & Res. Inst., TNAU, Eachangkottai, Thanjavur, Tamil Nadu – 614 902, India
Agricultural College & Research Institute, TNAU, Kudumiyanmalai, Pudukkottai, Tamil Nadu – 622 104, India
ICAR - Krishi Vigyan Kendra, Papparapatti, Dharmapuri, Tamil Nadu – 636 809, India
Horticultural College & Research Institute for Women, TNAU, Tiruchirappalli, Tamil Nadu – 620 027, India
Horticultural College & Research Institute, TNAU, Coimbatore, Tamil Nadu – 641 003, India
Abstract
"Salt Affected Soils" (SAS) refers to a category of soils that contain either an excess of soluble salts or exchangeable sodium. Soils are divided into four categories: normal, saline, sodic, and saline-sodic, based on the electrical conductivity (EC), pH and exchangeable sodium percentage (ESP) measurements. At the Horticultural College and Research Institute for Women in Trichy, fifteen genotypes of bananas were assessed for growth, yield, and physiological parameters in a saline-sodic environment. Four replications of the field experiment were set up in RBD and evaluated for three years. The growth physiological and biochemical characters were recorded in the seventh month after planting (MAP), and the bunch characters were recorded at harvest time. FHIA 1 (83.4%), Saba (81.0%) and Karpooravalli (78.0%) had the highest relative water content. The highest yield was recorded in FHIA-1 (23.5 kg), Saba (22.2 kg), Udhayam (22.5 kg) and Karpooravalli (22.0 kg). The sodicity injury symptoms in the leaves were evaluated using a scoring technique, and the genotypes FHIA-1(1.0) Saba recorded the lowest score for sodicity damage. A significant negative correlation was observed between salt injury degree and leaf K+/Na+. So, the varieties that maintain higher K+/Na+ ratio in leaf and root are salt tolerant. The general ranking of the banana varieties for salt tolerance was FHIA 1 > Saba > Karpooravalli > Bangrier > Ash Monthan > Veneetu Mannan > Udhayam. A comparative field trial for the 15 banana types showed that Saba, FHIA-1 and Karpooravalli could withstand sodic conditions in the field in terms of bunch characteristics, biochemical parameters, and plant growth. Grand Naine, Rasthali and CO 1 were vulnerable to sodicity stress. Regardless of cultivar, sodicity stress increased the days needed for shooting and harvest.
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