A TDR price of a length of 60 centimeters was installed vertically into a soil profile before seeding wheat in the spring. The growing season precipitation was 30 cm. TDR reading on May 15th was L0=2.900 meters; L1=5.114 m. On the day of harvesting (September 8th), the reading was L0=2.900 m and L1=4.331 m.
Assuming there were negligible drainage and runoff during the crop growing period, what war the average evapotranspiration rate firing the growing season? If the wheat yield was 2000 kg/hectare, what was the crop water use, and crop water use efficiency? (L0 is the initial peak reading and L1 is the end of valley reading from the TDR screen).
Solution
total use of water = 5.114 - 4.331 + 0.3=1.083 m = 108.3 cm depth in 115 days
avg evapotranspiration = 108.3/115= 0.939 cm/day
crop water use = 1.083*10 4 m 3 /hectare = 1.083 *10 7 kg /hectare
efficiency = 2000/( 1.083 *10 7 ) = 1.093 *10 -4
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A TDR price of a length of 60 centimeters was installed vertically int.docx
1. A TDR price of a length of 60 centimeters was installed vertically into a soil profile before
seeding wheat in the spring. The growing season precipitation was 30 cm. TDR reading on May
15th was L0=2.900 meters; L1=5.114 m. On the day of harvesting (September 8th), the reading
was L0=2.900 m and L1=4.331 m.
Assuming there were negligible drainage and runoff during the crop growing period, what war
the average evapotranspiration rate firing the growing season? If the wheat yield was 2000
kg/hectare, what was the crop water use, and crop water use efficiency? (L0 is the initial peak
reading and L1 is the end of valley reading from the TDR screen).
Solution
total use of water = 5.114 - 4.331 + 0.3=1.083 m = 108.3 cm depth in 115 days
avg evapotranspiration = 108.3/115= 0.939 cm/day
crop water use = 1.083*10 4
m 3
/hectare = 1.083 *10 7
kg /hectare
efficiency = 2000/( 1.083 *10 7
) = 1.093 *10 -4
