田區大小及形狀對均度試驗土壤異質性評估之影響
Other Title
Effects of Field Size and Shape on the Measurement of Soil Heterogeneity in Uniformity Trials
Journal
中華農業研究
Journal Volume
43
Journal Issue
2
Pages
165-172
Date Issued
1994-06-05
Date
1994-06-05
Author(s)
Abstract
本研究之目的在利用1991─1993年共兩年四期作的水稻均度試驗產量資料，探討田區大小及形狀對均度試驗土壤異質性評估之影響。同一試驗所估得之土壤異質性指標（b）不會因為年度期作之不同而有差異。田區大小形狀不同，對b值之估計有影響，小區太小，容易受到鄰近植株邊際效應之影響，而呈高度負相關之土壤異質性指標b＞1的極端異質狀態；隨著試驗田區面積增大至邊際效應已顯得不重要時，b值將可趨於穩定。但田區過大，均度試驗所需成本也愈高，因此在兼顧準確度及成本下，應探求一最小面積及最適形狀的田區。最小田區之決定，尚須考慮基本單位小區之選擇。均度試驗之田區大小至少要含有100個以上的基本單位，且田區形狀應儘可能接近於正方形。The purpose of this study was to investigate the effects of field size and shape on the measurements of soil heterogeneity. The yield data from the rice uniformity trials were obtained from four crop seasons in 1991-1993. The estimates of index of soil heterogeneity (b) at the same area did not vary with years and seasons. Change in field size and shape exhibited effects on the estimates of b. A b value greater than 1, which indicated negative correlation between contiguous plots, was obtained when the field size was too small.
Subjects
均度試驗
土壤異質性
田區大小
田區形狀
水稻
Uniformity trial
Soil heterogeneity
Field size
Field shape
Rice
Publisher
農業試驗所
Type
journal article
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