books soil depth
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# How does a person affect the soil?
# What are the components of soil?
# How do I preserve the soil?
# What are the types of soil?
# How does one preserve the soil?
# soil biology
# flooded soil
# alluvial alluvial soil
# soil erosion
# Determine soil fertility
# Soil properties and testing
# Soil study
# Analysis of nutrients in the soil
# Soil sterilization in protected crops
# New Zealand Health and Soil Association
# soil analysis
# Soil properties
# soil physics
# soil tests
# Vegetation cover and soil conservation
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Source: wikipedia.org
عمق التربة (Info)
كلما ازداد عمق التربة ازدادت المساحة التي تنتشر فيها الجذور، فتزيد بذلك كمية المواد الغذائية الممتصة من قبل النباتات. إن عمق التربة يعوض أحياناً عن فقر التربة بالعناصر الغذائية.
