稻田土壤還原電位之檢定及用於水分管理之研究
Other Title
Identification of Redox Potentials of Paddy Soils in Taiwan and Its Application to Water Management for Lowland Rice
Journal
中華農業研究
Journal Volume
33
Journal Issue
3
Pages
265-275
Date Issued
1984-09-05
Date
1984-09-05
Author(s)
黃明輝
M.H. Hating
Abstract
本研究首先探討本省稻田土壤還原電位（Eh ）之分佈及其對水稻生產之影響，進而研究晒田對土壤Eh 和水稻生產之影響，以尋求合理的水分管理。
（一）一期作時，片岩沖積土及東岸母岩沖積土之稻田較易發生高度還原問題。二期作在晒田前所有土類的土壤Eh7（Eh at pH 7.0 ）皆低於-150mV，指出二期作水稻分蘗盛期之土壤已高度還原。
（二）一期作晒田前之土壤Eh和稻穀產量有顯著正相關（r=0.24 * ）。二期作晒田後之土壤Eh 和稻穀產量亦為顯著正相關（r=0.34 * ）。這顯示土壤Eh 是影響水稻生產的重要因子；並且指出測定時機，一期作在晒田前，二期作在晒田後。
（三）晒田是提高土壤Eh 的有效方法。水分管理用W2之間歇灌溉方法對二期作水稻生產最有利，此方法比推薦法W3 增產稻穀10%。
This study was conducted to investigate the distribution of redox potentials(Eh) of paddy soils in Taiwan and its effect on the growth and yield of rice. A field trial on water management was carried out simultaneously in the experimental farm of this Institute to compare the influence of drying on Eh changes and the growth and yield of rice. The results are summaried as follows
1. During the 1st crop, Schist Alluvial soil(ScA) and East-coast Mother rock Alluvial soil (EMA) were easier to bring about higher reduction. During the 2nd crop, soil Ei7 (Eh at pH 7) of all the soil categories were below -l50mv before drying. It indicated that all the soil categories were already highly reduced during the active tillering period of the 2nd crop.
2. For the 1st crop, the correlation coefficient between soil Eh and grain yield was positively significant(r = 0.24*) before drying, while the correlation coefficient between soil Eh and grain yield was positively significant (r=0.34*) after drying for the 2nd crop. It shows that soil Eh is an important factor affecting the growth and yield of rice. It also indicates that soil Eh should be measured before drying for the 1st crop, while soil Eh should be measured after drying for the 2nd crop.
3. Drying (drainage to 0.2 bar soil moisture tention) is effective to increase soil Eh. For the 2nd crop, the water management of intermittent irrigation (W2) Was the most beneficial method. The grain yield of W2 was more than that of standard method (W3) by 10%.
Publisher
農業試驗所
Type
journal article
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