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Salt-affected environments

Salt stress affects rice lands in coastal areas because of the intrusion of seawater, inland areas where the underlying rock is rich in harmful salts, or where excessive irrigation is used without proper drainage. Rice in salt-affected areas can also suffer from other stresses such as nutritional imbalances, while drought and submergence can compound problems in other areas. 

Salt-tolerant varieties released. Bangladesh released six varieties from 2010 to 2013. Salt-tolerant boro variety BRRI dhan61 (BR7105-4R-2) is nonshattering, has medium slender grain, and has a yield potential of 4.0−8.4 t/ha. BINA dhan8 has bold-type grain, a shattering tendency, and yield potential of 3.5−7.5 t/ha.

India, likewise, released six salinity-tolerant varieties. CR Dhan 405 yields 3.6−4.9 t/ha while CR Dhan 406 yields 3.2−4.3 t/ha.

[List of salt-tolerant varieties released from 2009-2015]

Myanmar released Sangankhan Sinthwelatt in 2013 and screened various rice lines as potential parent donors for salt tolerance. IR84649-308-24-1-B and IR72829-3R-73-1-2 were the best (4.6−4.8 t/ha, respectively) in the Zalote location and were preferred the most by farmers. These promising IR lines were evaluated for grain appearance and eating quality by farmer-housewives. The farmers of upper Myanmar preferred these varieties because of their eating quality.

The Philippines released 18 varieties (Table 9). It also showcased an on-farm technology demo of salt-tolerant rice varieties and produced on-station quality seeds for commercialization. IR58443-6B-10-3 exhibited high tolerance at both the seedling and reproductive stage, with a maturity of 120 days.

Countries. India, Bangladesh, Vietnam, Philippines, Thailand, and Myanmar.