Abstract
A field experiment was conducted during the dry season of 2014 and 2015 at National Rice Research Institute (NRRI), Orissa, India, (20.5ºN, 86°E, and 23.5 meters above mean sea level). Seed priming was employed to enhance the anaerobic germination potential in two near isogenic rice lines (IR64 and IR64-Sub1). Under natural field condition, oxygen concentration in floodwater never dropped to zero. It varied from 3.0 to 5.2 mg L-1. Seed priming with calcium peroxide and seed soaking with water followed by sun drying showed greater beneficial effects as compared to potassium nitrate. Seed priming with sodium peroxide found deleterious. Cultivar IR64-Sub1 responded well due to seed priming as compared to cultivar IR64 under submergence. To improve anaerobic germination potential in rice, seed soaking with water followed by sun drying found economicalas compared to other methods of seed priming as this technique was not linked with additional investment in chemicals and was more environments friendly.
 SAARC J. Agri., 17(1): 37-48 (2019
Highlights
Rice is grown at different ecosystems starting from rainfed lowland flood prone to aerobic to irrigate ecology
The performances of cultivar in respect of plant establishment were significantly better in cultivar with IR64-Sub1 as compared to the cultivar IR64
Seed priming treatment P2 and P5 had greater positive effect whereas seed priming treatment P3 (Seed priming with sodium peroxide) had negative effect (Table 1)
Summary
Rice is grown at different ecosystems starting from rainfed lowland flood prone to aerobic to irrigate ecology. Under irrigate ecology, transplanting is the main means of rice cultivation whereas under aerobic condition, direct seeding is the only way. Under rainfed lowland, both direct seeding and transplanting methods are followed. Direct seeding reduces the cost of cultivation under irrigated condition whereas in addition of reduction of cost of cultivation in rainfed lowland, it imparts robustness in seedlings enabling them to withstand complete submergence during flooding (Sarkar, 1998). Direct seeding has several advantages, yet it needs a paradigm shift in the process of cultivation to realize the full potential of the method (Mamun, 2014)
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