• Journal of The Korean Society of Grassland and Forage Science
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• v.6 no.2
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• pp.111-118
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• 1986

Sysnthesis and accumulation pattern or nonstructural carbohydrates in orchardgrass (Dactylis glomerata L.) cv. Potomac and Baraula, perennial ryegrass (Lolium perenne L.) cv. Reveille and Semperweide and meadow fescue (Festuca pratensis Huds.) cv. Cosmos 11 and N.F.G. were studied under different meteorological environments and cutting managements. The field experiments were conducted as a split plot design with three cutting regimes of 6-7 cuts at grzing stage, 4-5 cuts at silage stage and 3 cuts at hay stage in Korea and West Germany from 1975 to 1979. The results obtained are summarized as follows: 1. Accumlation of nonstructural carbohydrates in temperate grasses was influenced by grass species and regional climatic environments. Total nonstructural carbohydrates (TNC) of orchardgrass, perennial ryegrass and meadow fescue in Korea, taken as average of all cutting regimes, were shown a value of 4.39%, 6.08% and 8.01%, respectively, while those under cool summer climatic condition in West Germany accumulated to 10.42% (orchardgrass), 18.02% (perennial ryegrass) and 12.73% (meadow fescue). 2. Nonstructural carbohydrates in orchardgrass were accumulated mainly as mono-and disaccharose, while those in perennial ryegrass resreved as fructosan. The contents of fructosan and mono-and disaccharose were 1.34% and 3.04% for orchardgrass, 3.25% and 2.83% for perenninal ryegrass, respectively. Meadow fescue had a concentration of 3.93% fructosan and 4.08% mono-and disaccharose. 3. Synthesis and accumulation of nonstructural carbohydrates in temperate grasses were negative associated with increasing of air temperature (P$\leq$ 0.1%). Under hot stress during summer season in Korea, the contents of fructosan, mono-and disaccharose were decreased to about 0.34% nd 1.28% from a value of 1.34% and 2.69% in spring season. In Freising and Braunschweig, the concentration of reserved carbohydrates was less influenced by growing season. 4. Synthesis and accumulation pattern of nonstructural carbohydrates were shown a great respons to cutting frequency of the plants. Frequent cutting system under high temperature lowered the accumulation of reserved carbohydrates, especially fructosan and also caused to decrease the plant regrowth. However, under cool temperature, it shows a less differences of tructosan, mono-and disaccharose in the plants at all cutting systems.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.3
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• pp.274-279
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• 1989

The objective of the study was to determine optimum clipping time, interval and height of Suwon 1 pearl millet hybrid in Korea to increase forage yield and quality. Clipping height 20 cm above the ground surface was the best resulting in producing 11.1 tons per hectare of green chop. However, clipping height 5 cm was not good for regrowth of the ratoon crop. Just after the first cutting when the plant height reached two meters around mid-July, four weeks cutting interval was the best for higher forage yield of 11. 4 tons per hectare. Crude protein content of the clipping height 20 cm was the highest being 12.8 percent. Dry matter of the first cut contained 14 percent of crude protein being the highest, and with lower crude fiber content of 24 percent. And also four weeks cutting interval was the highest in crude protein content being 13.1 percent along with lower crude fiber content of 24.2 percent. Thus, the forage yield depended on clipping height greatly, but the quality was dependent upon clipping time, interval and frequency more than cutting height pearl millet plant. It would be desirable for higher yield and quality of Suwon 1 pearl millet hybrid to cut three or four times during the growing season at 20 cm clipping height and at four weeks clipping interval from the first cut when the canopy height is above one meter under the Korean environmental conditions.