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Timothy 초지에 있어서 춘계의 질소시비 시기가 목초수량에 미치는 영향
이인덕,윤익석 ( In duk Lee,Ik Suk Yun ) 한국축산학회 1978 한국축산학회지 Vol.20 No.4
The purpose of the investigation was to examine the effect of applying nitrogen at different times on the yield from April to October, to established timothy pasture in the Alpine area. The experiment was carried out with six accumulated temperature totals from 1. January to the time when the nitrogen(8㎏/10a) was applied; (A) 150℃(14th, Apr.), (B) 250℃ (26th, Apr), (C) 350℃(7th, May), (D) 450℃(18th, May), (E) 500℃(26th, May), (F) control. The results obtained are as follows; 1. In the alpine area (800m, a, s,l) the early vegetative growth began on 26th, April in 1977. This beginning was 8 days earlier than the average for the last 10 years. 2. The highest dry matter yield of timothy was observed at the middle of June, half of the total annual dry matter yield was produced by the middle of June. 3. In 1977 The $quot;B$quot; plot 250℃ showed the highest dry matter yield with 626.7㎏/10a (p$lt;0.01) 4. The maximum yield of dry matter per ㎏ N was obtained at $quot;B$quot; plot (32.13㎏/10a) with the accumulated temperature of 254.4. ℃, $quot;D$quot; plot 26.89㎏/10a, $quot;C$quot; plot 26.36㎏/10a, $quot;E$quot; plot 25.41㎏/10a, $quot;A$quot; plot 21.72㎏/10a. 5. The earlier the nitrogen toes applied the higher the dry matter percentage was marked. The dry matter percentage in F plot (27.2%) was higher than those in other plots. The average dry matter percentages the 1st cutting, 2nd cutting and 3rd cutting were 22.8%, 24.6% and 23.9% respectively.