Seedbed management for enhanced rice seedling growth in cool elevated area
2003
Sigari, T.A. | Desamero, N.V. | Cabigat, J.C. | Abayao, E.B. | Casimero, M.C. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija (Philippines). Banaue Local Government Unit)
A study was carried out in 2002 in Banaue [Philippines] to evaluate the impact of different seedbed management in enhancing seedling growth. The study included two varieties (PSB Rc44 and Palawan) and two different sets of seedbed. In one set, the seedbed was covered by plastic, providing an increased temperature while another set was uncovered. Pre-germinated seeds were sown (50 g/sq m) on the seedbed on December 1. Seventeen days after seeding (DAS), number of seedling per sq m, seedling height (SH), shoot dry weight (SDW) and root dry weight (RDW) were measured using random sampling. Both cultivars produced more vigorous seedlings in seedbed with plastic cover. On the average, number of seedlings per sq m increased by 26%, SH by 38.9%, SDW by 54.7% and RDW by 58.7%. Both cultivars produced sizable seedlings (21.5 cm for PSB Rc44 and 18.7 cm for Palawan) within 16 days. However, the impact of increased temperature was much higher on PSB Rc44 (improved cultivar) than Palawan (locally adapted variety). In PSB Rc44, SH increased by 51.5%, SDW by 44.5% and RDW by 78.3%. For Palawan, the increases were 27.3%, 42.4% and 39% respectively, which could indicate higher adaptation of Palawan to prevailing low temperature at seedling stage. The results showed that sizable seedlings could be produced in much shorter time if the seedbed are covered. It also showed that the cultivars could be differentiated on the basis of their relative seedling growth and this can be used for the selection of breeding lines for cold tolerance at early seedling stage. More studies howeve, are needed to validate this assumption
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