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頁籤選單縮合
題 名 | 蘇丹草季節性生長與再生關係 |
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作 者 | 王永琴; 李免蓮; | 書刊名 | 畜產研究 |
卷 期 | 28:4 1995.12[民84.12] |
頁 次 | 頁319-327 |
分類號 | 437.113 |
關鍵詞 | 蘇丹草; 不同生長期; 生長性狀; 分蘗節位; 再生; Sudangrass; Growth season; Tiller and nodes; Regrowth; |
語 文 | 中文(Chinese) |
中文摘要 | 本試驗之目的在探討蘇丹草之分藥習性並了解不同生長環境下割刈對蘇丹草再生之影響。試驗結果顯示,冬播蘇丹草生長幾近停滯,且分藥數甚少僅止於低節位之2~3分蘗。春播蘇丹草初期生長雖緩慢,但三月中旬以後生長顯著加快,隨生育期進展,高次、高節位分?陸續出現。夏播蘇丹草全生育期生長快速,第一次分蘗生長旺盛,第二次分蘗較少且僅限於低節位分蘗。秋播蘇丹草之生長性狀及分蘗數均隨生育日數而有明顯增加現象,然高節位分蘗較夏播蘇丹草更少。 任何播期蘇丹草之青割產量均以第一次青割產量最高,其後割次產量漸減。又,越冬後之蘇丹草產量均顯著下降。青割後分蘗之再生以割後1星期內之增加最快,並持續至割後4星期,其後漸緩至第6週分蘗數達最高。 氣溫為蘇丹草生長之重要因子,當氣溫低於20℃時其生長速度緩慢甚至停滯。而春播生育期屬上昇型氣溫,有利蘇丹草分蘗之發育及生長。此外,分蘗數之增加為影響蘇丹草產量(鮮草量)之重要因素。 |
英文摘要 | Tifton, a line of sudangrass was used to evaluate the growth habit and regrowth ability in different growing seasons. Growth of sudangrass in the winter season nearly stopped in the middle growth stage with only 2 or 3 tillers at the lower nodes of the main stem. Sudangrass grew slowly in early stage but the growth turned faster after mid-march in the spring crop. Tillering occurred with vigor through this crop season and many tillers were from the higher nodes of the main stem and of the tillers. In summer crop, sudangrass grew fast through out the growing season and grew as many tillers as those in the spring crop. The only difference was that in summer crop most tillers were the primary tillers (attached to the nodes of main stem), and few were the secondary tillers (from nodes of tillers). Sudangrass grew steadily with time and many tillers appeared in the fall crop although few were from higher nodes of the main stems. Fresh yield was the highest in the first cut in all crop seasons which decreased with cutting frequency. Besides, the yield obviously decreased with overyearing (wintering).. Shoot regrew vigorously from one week to four weeks after cutting. The number fo tillers peaked at 6 weeks after cutting in both spring and summer crops. The ascending type of air temperature from 18℃ to 27℃ in the spring growing season was optimum for sudangrass to grow tillers. Sudangrass grew slowly or hardly grew as the ambient temperature went down below 20℃. |
本系統中英文摘要資訊取自各篇刊載內容。