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Surat Thani, Thailand

Chanprasert W.,Kasetsart University | Myint T.,Myanmar Perennial Crops Enterprise | Srikult S.,Surat Thani Oil Palm Research Center | Wongsrit O.,Surat Thani Oil Palm Research Center
Journal of Oil Palm Research | Year: 2012

The effects of two neonicotinoids at three application rates (0, 2.5 and 5.0 ml kg seed for thiamethoxam, and 0, 2.0, 4.0 g kg 1 seed for imidacloprid) and two methods of breaking dormancy (dry heat treatment and operculum removal) on seed germination and seedling vigour were determined in tenera oil palm seeds. The results reveal that the seeds with operculum removed took a shorter time to germinate than the dry-heated seeds, regardless of the neonicotinoid treatments. Thiamethoxam and imidacloprid had no promoting effects on seed germination or on time to 50% germination (T50). In this study, phytotoxicity effects zvere observed with the neonicotinoid treatments in the operculum-removed seeds in terms of the percentage of seeds producing shoots and roots as compared to the normal seedlings (control); such effects were not found in the dry-heated seeds.

Myint T.,Kasetsart University | Chanprasert W.,Kasetsart University | Srikul S.,Surat Thani Oil Palm Research Center
Seed Science and Technology | Year: 2010

Seed weight is often related to germination. The response of seed weight in relation to seed physical characteristics on germination of tenera oil palm crosses was studied at the Surat Thani Oil Palm Research Center, Thailand. Seeds of seven crosses were categorized into three different seed weight groups, i.e. light (1.6-3.1 g seed-1), medium (3.2-4.6 g seed1) and heavy (4.7-6.1 g seed1). The results revealed that almost all seed physical characteristics traits like seed weight, seed volume, shell thickness, shell weight, kernel weight and number of kernels per fruit ranked higher in heavy seeds than medium and light seeds. Germination was increased with increased seed weight. The average germination percentage of the seven oil palm crosses was 64.3% for light seeds, 69.8% for medium seeds and 77.5% for heavy seeds. Germination was also different among oil palm crosses. The highest germination percentage was found in cross no. 23 (80.8%) and the least in crosses no. 35 (64.4%) and 40 (63.4%). The present study showed germination was influenced by seed weight and cross, but there was no interaction between these two factors. The results suggested that seed weight is a factor influencing germination of oil palm seed.

Myint T.,Kasetsart University | Chanprasert W.,Kasetsart University | Srikul S.,Surat Thani Oil Palm Research Center
Seed Science and Technology | Year: 2010

Scarification is needed to liberate the seeds from physical dormancy. The different scarification methods, such as removal of the operculum through the germ pore, drilling two holes through the shell and removal of the shell combining with or without heat were observed to find out the best dormancy breaking method comparing with commercial dry heat (control) in tenera oil palm seed of cross 23 and 37. Among the scarification methods, operculum removal without heat gave the highest germination and showed no significant variation with control (80.66% vs 85.17%), whereas highly significant differences with all other methods which yielded very low. Time to emergence, T50 and time to final germination were rapid in the operculum-removed seed without heat over the controlled seed. There were no differences of final germination in both crosses. The results suggested that operculum removal without heat affected obviously on germination. This method could remove the limitations of the control treatment associated with time consuming and high cost of process, and may be developed as a practical guide for the planters with economic aspect.

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