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  • Author or Editor: Dong-Kum Park x
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The fruits of pumpkin are good material for soup and a very popular side dish in Korea. The purpose of this study was to investigate how number of fruit set per plant (2, 3, or 4 fruit) affected production of dried seed and fruit yield. `Golden Delicious' (GD) and hull-less (HL) pumpkins were planted 60 cm apart in 200-cm rows. Production of dried seed per hectare (11,000 plants) were 1985, 2193, and 2074 kg, respectively, at 2-, 3-, and 4-fruit set per plant for GD. The fruit yield per hectare (11,000 plants) was 58,360 kg for 2-fruit set treatment, 74,680 kg for 3-fruit set, and 73,240 kg for 4-fruit set per plant for GD. The production of dried seed per hectare (11,000 plants) was 535, 603, and 545 kg, respectively, for 2-, 3-, and 4-fruit set per plant for HL. The fruit yield per hectare (11,000 plants) was 28,200 kg for 2-fruit set treatment, 44,660 kg for 3-fruit set, and 39,200 kg for 4-fruit set per plant for HL. The highest production of dried seed and fruit yield were for 3-fruit set per plant for GD and HL. Differences in production for dried seed and fruit yield, as influenced by number of fruit set per plant, were also characterized.

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Growth response of `Sambok Honey' watermelon grafted onto different rootstocks, including four Citrullus rootstocks and three other cucurbitaceous rootstocks, was evaluated at low and normal temperature regimes. Marked reduction in plant growth rate was observed in plants grown at low temperatures as compared to those grown at normal or optimal temperatures. Relative growth reduction rates were 40% to 48% for vine length, 39% to 51% for total leaf area, 37% to 60% for shoot fresh weight, and 50% to 79% for shoot dry weight, respectively. Watermelon rootstock PI 482322 showed comparable plant growth as the most popular rootstock (Shintozwa pumpkin) even at low temperatures. `Sambok Honey' watermelon grafted onto watermelon hybrids `PI 271969 × PI 296341' and `PI 271769 × Calhoun Gray', showed comparable plant growth as FR Dantos bottle gourd rootstock. Index of growth ability at low temperature (IGALT), which was calculated on the basis of reduced rate of vine length, dry weight, and leaf area, was comparatively high in C. martinezii, Shintozwa, PI 482322, and `PI 271769 × PI 296341' rootstocks (50% or higher) and lowest in own-rooted `Sambok Honey' or in watermelon plants on `Knight' rootstock. Watermelon hybrids `PI 271969 × PI 296341' and `PI 271769 × Calhoun Gray' exhibited better or at least comparable growth at low temperatures as compared to `FR Dantos', thus confirming the feasibility of using watermelon rootstocks even in winter greenhouse conditions.

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