Mobile weighting type observing system for crop water requirement

Abstract

The invention discloses a mobile weighing crop water demand observation system, which is characterized in that it comprises a measuring cylinder (1), a movable truss (2), a weighing device (3), a rainproof shed (4) and a measuring cylinder area (5); the measuring cylinder (1) is multiple, and each measuring cylinder (1) is installed in the measuring cylinder area (5) in the way of buried double sleeves, and the movable truss (2) is erected on the Above the measuring cylinder area (5), the weighing device (3) is installed on the movable truss (2) through a pulley and can be moved to the top of each measuring cylinder (1) to lift and weigh it. The rainproof The shed (4) is erected on the track dedicated to the long side direction of the measuring cylinder area (5), which can avoid the influence of wind and precipitation on the observation. The invention can observe the water demand of crops with an accuracy of 0.03-0.1mm in the change of water layer, can meet the strict requirements of irrigation tests on precision, and has the characteristics of low cost and small occupied area, and is suitable for popularization in agricultural irrigation tests.

Description

technical field [0001] The invention relates to the technical field of agricultural water conservancy, in particular to a mobile weighing type crop water demand observation system. Background technique [0002] In recent years, with the adjustment of the agricultural industry structure, the traditional low-efficiency agriculture has gradually transformed into a modern high-efficiency industry. At present, the planting area of ​​grain crops has decreased, the area of ​​economic crops such as vegetables, melons, fruits, and flowers has expanded, and profitable agriculture has developed rapidly. The development of profitable agriculture requires the support and guarantee of water resources, and only by choosing an appropriate irrigation and drainage model can the goal of saving water and increasing production be achieved. In order to develop irrigation techniques and irrigation and drainage patterns related to profitable agriculture, relevant irrigation experiments need to be ...

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Problems solved by technology

[0004] At present, the traditional method of crop water demand test is the test pit method, but the test pit covers a large area, usually 2m×2m, and the investment cost is high. When the test treatment or repetition is large, it cannot meet the needs of the test.

In the existing technology of measuring the water demand of crops with the measuring cylinder, the main principle is to move the cylinder to weigh. When the measuring cylinder is hoisted to the top of the pit for weighing, the large displacement makes it difficult to restore the measuring cylinder in time, resulting in large test errors.

On the other hand, the calculation method of crop water demand mainly adopts the Penman method, that is, the crop water demand is calculated by referring to crop evaporation, but this method only considers the influence of various atmospheric factors (temperature, solar radiation, wind speed), and does not take into account the soil The situation of moisture status and insufficient irrigation conditions is taken into consideration, and the lack of physical basis leads to large errors; secondly, even if soil moisture sensors are used to monitor soil moisture data, the accuracy range of traditional FDR soil moisture sensors to measure soil moisture content is only 3-5mm. It cannot meet the accuracy requirements of the irrigation test for water balance elements of 0.03mm to 0.1mm, so it is still impossible to obtain accurate crop water demand observation data

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