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Studies on Measurement Principle and Design Method of New Electric Weighing Lysimeters

Author: LiuShiPing
Tutor: FengShaoYuanï¼›KangYueHu
School: China Agricultural University
Course: Agricultural Engineering
Keywords: Lysimeter Transpiration evaporation Irrigation system Equipment
CLC: S237
Type: Master's thesis
Year: 2005
Downloads: 361
Quote: 1
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Abstract


The water balance and the SPAC system water running study is one of the foundations of the theory of efficient use of agricultural water . In the water balance , the more difficult determination of the elements of farmland transpiration evaporation, capillary rise of groundwater and soil water leakage . Accurate determination of these elements has a very important significance for the quantitative study of water balance and improve the accuracy of the evaluation of water resources . \Developed to meet the accuracy requirements of the measuring instrument has become an inevitable requirement of irrigation and hydrological scientific research . In this thesis, a systematic study of the new electronic weighing lysimeter working principle and design method . Work in accordance with the load cell , the new large weighing lysimeter divided into two types : fixed and hanging . New large weighing lysimeter through the rally sensor or pressure sensor soil weight ( kg ) into an electrical signal by the data acquisition system stored into the lysimeter ( mm ) , high precision , simple operation , to overcome the existing Lysimeter check calculated as tedious method of operation. Fixed lysimeter cylindrical area of 1.6m 2 , the depth of 1.265m , precision 35g ( equivalent to 0.022mm water depth ) . Suspension lysimeter cube-shaped area of ??0.4m to deep 0.8M , accuracy 20 g ( equivalent to 0.05 mm depth ) . New Lysimeter protection tube with the surrounding soil isolation open to avoid the construction of the basement , reducing the the Daejeon soil disturbance , and low cost , easy maintenance. New Lysimeter guidance crops, pasture and forestry rational use of water , for the study of soil - plant - atmosphere system in the law of motion of the water , make reasonable scientific irrigation system , water conservation , and promote crop growth will have a positive effect for field evapotranspiration and crop water consumption regularity of state-of-the-art equipment .

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CLC: > Agricultural Sciences > Agricultural Engineering > Mechanization of agriculture > Agricultural equipment, instruments and equipment
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