Tropical Grasslands (2001) Volume 35, 129–138

Effects of plant spacing and sowing time on seed yield and seed quality of Paspalum atratum in Thailand

C. PHAIKAEW1, C. KHEMSAWAT1, S. TUDSRI2, Y. ISHII3, H. NUMAGUCHI3 and E. TSUZUKI3

1Division of Animal Nutrition, Department of Livestock Development, Bangkok, Thailand
2Faculty of Agriculture, Kasetsart University, Bangkok, Thailand
3Faculty of Agriculture, Miyazaki University, Miyazaki, Japan

Abstract

The effects of plant spacing on seed yields of Paspalum atratum were evaluated in 1996–1998 on a low lying, infertile soil in Yasothorn province, north-east Thailand, comparing 4 plant spacings of 75 × 75, 75 × 100, 75 × 125 and 100 × 100 cm. All spacings produced high seed yields (average 819 kg/ha), with no differences between row spacings. All plant spacings produced seed of high quality, with seed germination and thousand pure-seed weights averaging 85% and 3.1 g, respectively. However, there was a tendency to obtain higher yields of good quality seed from the wider row spacings of 100 and 125 cm in all 3 years.
In a separate study at 3 sites at different latitudes in 1998, time of sowing (March–July) had significant effects on seed yield and seed quality of P. atratum at all 3 sites in the establishment year. Early sowing in March produced the highest seed yield, followed by April, May and June with no seed from July sowings. Only the Lampang site (higher latitude) produced acceptable seed yields from sowings in June (660 kg/ha). Mean seed yield from sowings in March–May at Lampang was 1100 kg/ha. This suggests that P. atratum has a long-day requirement for induction of flowering.

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