Seed dessication and storage studies of some Dipterocarp tree species in the Philippines
1994
Dayan, M.P. | Reaviles, R.S. (Ecosystems Research and Development Bureau, College, Laguna (Philippines). Grassland and Degraded Area Ecosystems Research Div.)
Immature and mature seedlots of Parashorea malaanonan dried faster at 29 deg C and 15 deg C than at 26 deg C. Germination of matured seedlot was reduced significantly at 29 deg C from 75.48 to 57.69 percent, and 75.48 to 39.86 percent at 15 deg C. Insignificant change in germination percentage was observed at 26 deg C from 75.48 to 63.03 after four days of drying. The critical moisture content [MC] for the species falls at 44 percent. Hopea foxworthyii seeds dried faster at 29 deg C than at 36 deg C. Drying the seeds at 26 deg C for seven days still produced 87 percent germination. The critical MC falls at 38 percent. Temperatures at 15 deg C, 26 deg C and 29 deg C caused rapid reduction of MC and germination of Anisoptera aurea. The critical MC for the species falls at 43 percent. H. foxworthyii seeds sealed in plastic bag and stored at 15 deg C maintained MC from 38 to 42 percent and germination of 60 percent after 48 days of storage. Treated and untreated seeds of Dipterocarpus grandiflorus and stored at 8 deg C maintained its MC from 41 to 50 percent. Treated seeds stored for 13 days got 60 percent germination. Zero germination was observed after 50 days for both treatments. Matured seedlots of Parashorea malaanonan with fungicide can be stored for 32 days at 15 deg C with germination range of 43 to 87 percent and MC of 46 to 53 percent. Less matured and untreated seeds can only be stored for three days while treated seeds could last 10 days. MC of both treated and untreated seeds of Shorea squamata did not differ much after 16 days. No significant differences were also observed on germination percentage of both treatments after 9 days, but germination was significantly reduced after 16 d for both treatments
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