Determination of evapotranspiration and crop coefficient (kc) of sugar beet using lysimeter and comparing it with experimental methods in Shahrekord

Document Type : Scientific - Research

Authors

1 Associate Professor of Soil Physics ,Soil and Water Research Institute, Iran

2 Irrigation Research ,Soil and Water Research Institute, Iran

Abstract

This study aimed at determining the evapotranspiration and crop coefficient (kc) of sugar beet during the plant growth using drainage lysimeter by using water balance and experimental methods for three years in Shahrekord. After sugar beet planting and out of lysimeter, evapotranspiration was measured weekly and monthly by measuring the factors of the water- balance equation. Results showed that the total evapotranspiration of sugar beet was 1016.6 mm during the growing season and the rate of water drainage and the soil moisture content were 73.9 and 66.1 mm, respectively. The amount of evaporation from class A pan was 1364.5 mm. Evapotranspiration of the reference plant was measured by using drainage lysimeter and estimated by using the experimental methods. Rusults showed that the evapotranspiration rate of the reference plant was 1123.03 mm and among the experimental methods, the Blaney- Criddle FAO24 and Penman-Monteith FAO 56 method had more accuracy. Crop coefficient at early stage, development stage, middle stage, and final stage was 0.72, 0.81, 1.04, and 0.7 with an average of 0.89 for the whole growing period of sugar beet. The average pan evaporation coefficient (Kp) was 0.83, and the average water requirement coefficient (Kc.p) was 0.73 for the growing season of sugar beet. In other words, sugar beet water requirement was 0.73 of the evaporation from the evaporation pan, and by having the amount of evaporation from the pan, one can estimate the under requirement of the crop with an acceptable accuracy. Water use efficiency for root and white sugar was 5.14 and 0.753 kg m-3, respectively.

Keywords

References

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