Question: Assume that the effective root zone for soybeans in a field was 4 5 cm . A soil core of 4 5 cm in length
Assume that the effective root zone for soybeans in a field was cm A soil core of cm in length was taken from the field hours after the field was uniformly saturated and allowed to drain. It is generally assumed that water in macropores pore diameter mm in diameter and mesopores pore diameter between and mm are drained and water only remains in the micropores diameter mm after hours of free drainage. In addition, macroporosity, mesoporosity and microporosity are defined as the volume fraction of macroporse, mesopores, and micropores in the soil, respectively. The following information was known or was obtained from the soil sample:
Soil sample volume cm Wet soil weight g
Dry soil weight g Particle density of soil g cm
Permanent wilting point cm cm A What is the massbased soil water content in kg kg BWhat is the bulk density in g cm C Assuming the density of water is g cm what is the volume of water in the soil core in cm D What is the volumebased soil water content in cm cm E What is the volume of pore in the soil core in cm FWhat is the volume of solid in cm G What is the total porosity in cm cm H What is the void ratio? I What is the sum of macro and mesoporosity in cm cm J What is microporosity in cm cm
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