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題 名 | 栽培密度對半結球萵苣生育及產量之影響=Effect of Planting Density on the Growth and Yield of Loose Head Lettuce "Lactuca sativa var. capitata L." |
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作 者 | 張簡秀容; 許苑培; | 書刊名 | 桃園區農業改良場研究彙報 |
卷 期 | 54 2003.09[民92.09] |
頁 次 | 頁16-34 |
分類號 | 435.252 |
關鍵詞 | 萵苣; 栽培密度; 生長分析; Lettuce; Planting density; Plant growth; |
語 文 | 中文(Chinese) |
中文摘要 | 本試驗旨在探討栽培密度對半結球萬直生長速率及產量之影響,以半結球萵苣大湖659為供試品種。栽培行株距分為13×15、20×20、20×25、40×30、40×35、40×40 cm等六種處理,小區栽培密度依次為144、76、60、36、33及30plants/3.2m2。結果顯示,栽培密度高者,移植之後,其植株鮮重之生長速率(Absolute Growth Rate; AGR)及乾重之相對生長速率(Relative Growth Rate; RGR)的最大值較早到達,密度低者則較晚到達,密度愈高其RGR最大值持續的時間較短,並且RGR下降的速率較大,反之則持續較長的時間,下降的速率亦較緩慢。密度愈高葉面積比(Leaf Area Ratio; LAR)及葉面積指數(Leaf Area Index; LAI)隨著增大,當密度大於60plants/3.2m2時,反而變小。密度低者其葉比重(Specific Leaf Weight; SLW)變大,但未達顯著水準。密度低者其葉比面積(Specific Leaf Area; SLA)變小,因此,密度低者其葉片增厚,葉面積減少。密度太高或太低均使單位面積產量下降,而以密度60plants/3.2m2(行株距20×25cm)之產量最高。 |
英文摘要 | Experiments were conducted to determine the effect of planting density on the Absolute Growth Rate (AGR) of fresh weight, Relative Growth Rate (RGR) of dry weight, and yield of loose head lettuce 'Great Lake 659 '. Population density ranged from 30~144 plants/3.2m2. Data for plant growth characteristics were recorded starting from a week after transplanting, and then keeping on in a time interval 5~7 day. Both AGR of fresh weight and RGR of dry weight increased at early stage of growth, 31 days after transplanting, and then decreased immediately in response to higher plant populations. They increased in later age and prolonged for a longer period in lower plant populations. Leaf Area Ratio (LAR) and Leaf Area Index (LAI) increased with plant populations, but they decreased when the populations were over 76 plant/3.2m2. Specific Leaf Weight (SLW) increased and Specific Leaf Area (SLA) decreased with lower populations, so the leaves thickness increased and leaf areas decreased. Largest total yield increases occurred with a population 60 plant/3.2m2, spacing at 20×25 cm. This observation suggested that the higher yields per unit at higher plant populations were attributed to more plant with a lower weight of shoots per plant. So produced of a larger-sized shoot was lower with a high plant density. It is suggested that this cultivars should be spaced with the range of 20×25 cm for optimum utilization. |
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