Seedling emergence of wet direct-seeded rice
1999
Cruz, R.T. | Collado, W.B. | Redona, E.R. (Philippine Rice Research Inst., Maligaya, 3119 Munoz, Nueva Ecija (Philippines). Agronomy, Soils and Plant Physiology Div.)
The number of farmers adopting wet direct seeding (broadcasting pre-germinated seeds onto saturated soil) has increased due to increasing cost of labor and/or decreasing farm labor. In contrast to transplanted rice, management technologies particularly during seedling establishment have to be improved for wet direct seeded rice. Problems in soil and water management, pests (snail, rats and birds), crop lodging and low soil oxygen have to be overcome to successfully establish a wet seeded rice. While anaerobic seeding (broadcasting pre-germinated seeds immediately after the final land leveling) can reduce pest problems, its low oxygen condition can hamper seedling emergence. Hence, there is a need to test the seedling emergence capabilities of varieties and breeding lines to anaerobic seeding. Around 200 entries were field-tested at PhilRice Experiment Station for seedling emergence index (SEI) under anaerobic condition and optimum nitrogen fertilizer management. SEI is briefly defined as the number of seedlings that emerge on a given sampling time. Among the outstanding entries tested, RP2071-26-3-3 from India had a mean SEI of 75 followed by BR736-20-3-1 (Bangladesh) with SEI of 62 and IR4905-19-1-1-2-2 (Philippines) with SEI of 57. SEI was compared to other plant parameters such as relative growth rate, leaf area index and specific leaf area
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