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Studies on nutrient metabolism and cutting treatment in ladino clover and orchardgrass vii. seasonal variation of reserve constituents and feed value by cutting time in orchardgrass



Studies on nutrient metabolism and cutting treatment in ladino clover and orchardgrass vii. seasonal variation of reserve constituents and feed value by cutting time in orchardgrass



Korean Journal of Animal Science 28(4): 193-198



This experiment was carried out to evaluate the seasonal variation of total water-soluble carbohydrates (TSC) and crude protein content in orchardgrass stubble and the feed value of orchardgrass by cutting time in the first, second and third crops. This was performed in 2-year-old orchardgrass plots from Feb. 25, 1983 to Oct. 25, 1983. The results obtained were as follows: 1. The TSC accumulated during the period of cool season, and declined when the weather was hot and dry. 2. During the period of cool season, the reserve level decreased when new leaf after the start of plant growth emerged and then increased rapidly, however, decreased after seed ripening. 3. Levels of carbohydrate content decreased sharply following the top-dressing applied simultaneously with the cutting. When the top-dressing was followed by a period of hot dry weather, carbohydrate reserves were often reduced to critical levels. In such weather conditions, the top-dressing on orchardgrass should be restricted. 4. Crude protein content increased at the early growth stage and then decreased as the plants aged. Especially, crude protein content increased rapidly following nitrogen fertilization and then decreased. 5. Because the rate of decreasing the feed value in the first crops was larger than that in the second and third crops as cutting time was delayed, the first crops must be cut and utilized when the crops were suitable to be cut.

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