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Soil testing. A pH meter showing the alkalinity of soil. Farmers and gardeners use pH meters to determine the pH level of soil to assess its suitability for different plants. A probe placed in the soil measures the amount of free hydrogen ions present, giving a value on the pH scale. A pH of 7 is neutral, above 7 is alkali and below 7 is acid. This meter displays a pH of 7-8, meaning that this is an alkaline soil. Some plants are intolerant of alkaline soils, and so corrective procedures may be necessary to decrease the soil pH to make it more suitable. For images showing pH tests for acid and neutral soils, see E770/1091 and E770/1092.
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Details
Creative#:
TOP01490995
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
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