Calculation of a mean diameter and soil moisture contour volume under drip irrigation

Shtanko, A. S.; Shkura, V. N.

doi:10.31774/2222-1816-2018-3-39-57

Cited by 2 publications

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“…где кон  = 0,785 Полученные опытные контуры влажности, вкупе с другими, полученными нами ранее [11,12], использованы при разработке методики расчета поливной нормы для капельного орошения почвы с формированием в почвенном пространстве локального первичного контура влажности. 12 почвы с определенными значениями размерно-влажностных параметров, позволил выбрать приемлемую для расчета зависимость вида, л/кап.…”

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Determining the Irrigation Rate for Drip-Moistened Soil Primary Local Contour Formation

Shtanko¹,

Shkura²

2023

LRAHE

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Purpose: development of methodology for determining the irrigation rate value, which ensures the formation of a primary local contour of moistened soil in the soil space under drip irrigation with one emitter. Materials and methods. The methodological and factual basis of the development were materials and empirical dependencies obtained from the data of author's field studies of local moisture contours formed under various soil conditions with above-surface and surface drip irrigation. Results and discussion. The analysis and evaluation of known approaches to the calculation of irrigation rates for drip irrigation of plants is carried out, the direction of the development of the methodology is determined. Based on materials of field and office studies, 11 contour profiles of drip-moistened soil formed under various soil and technological conditions of drip irrigation were obtained. Soil conditions are characterized by a wide range of changes in their parameters: the content of physical clay is from 20.8 to 74.6 % of the dry soil mass (DSM), the lowest moisture capacity is from 16.9 to 32.2 % of DSM, the level of additional irrigation moisture is from 60 to 70 % of the lowest moisture capacity. Moisture contours were formed with an average soil moisture content of 90 % of the lowest moisture capacity. Empirical dependencies for determining the maximum and average radius (diameter) of moisture contours at given depths of the moistened soil layer, which make it possible to predict the volumes of moisture contours are obtained. The dependence and a method for calculating the irrigation rate value, which ensures the formation of a moisture contour of a given depth and a given level of soil moisture, are obtained for a wide range of granulometric and water-physical characteristics of soils. Conclusion. A method for calculating the irrigation rate required for the formation of a local moisture contour in soil space with specified dimensional and moisture parameters during irrigation water delivery by one drip micro emitter is proposed.

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Determining the Irrigation Rate for Drip-Moistened Soil Primary Local Contour Formation

Shtanko¹,

Shkura²

2023

LRAHE

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Modeling the Effect of Fertilizers on the Dynamics of Moisture Contours at Drip Irrigation

Uspensky

Fadeev

Алексеев

et al. 2021

Engineering Technologies and Systems

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Introduction. A review of research on modeling and calculating moisture contours shows that at this stage there is a developed formalized mathematical apparatus connecting physically reasonable parameters and hydro-physical properties of soils. However, to improve the efficiency of drip irrigation and fertigation, it is necessary to determine the effect of fertilizers dissolved in irrigation water on hydrophysic properties of soil, and on the basis of the findings to determine the effect of fertilizers on shapes and sizes of moisture contours. Materials and Methods. To investigate the effect of fertilizers on the dynamics of moisture contours, potassium monophosphate was used, because it has a “bad” mobility in soil and it is cost-efficient to be introduced into irrigation water. Potassium monophosphate effects on density, viscosity, osmotic pressure, moisture contact angle and surface tension of irrigation water. As a result, there are changes in soil water retention curve and its hydraulic conductivity function. Therefore, moisture contours are formed with small, but still significant differences. Results. A software tool has been developed that allows exploring the dynamics of the moisture contours of different soil types and texture with different porosity and with a previously known moisture distribution in depth. Discussion and Сonclusion. When potassium monophosphate or other nutrients are added to water, small changes of the formation of moisture contours are observed. The results obtained enable us to calculate irrigation norms at the design stage of the planning process of fertilizer distribution with irrigation water during drip irrigation for different concentrations.

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Calculation of a mean diameter and soil moisture contour volume under drip irrigation

Cited by 2 publications

References 0 publications

Determining the Irrigation Rate for Drip-Moistened Soil Primary Local Contour Formation

Determining the Irrigation Rate for Drip-Moistened Soil Primary Local Contour Formation

Modeling the Effect of Fertilizers on the Dynamics of Moisture Contours at Drip Irrigation

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