Application of hybrid ANN-whale optimization model in evaluation of the field capacity and the permanent wilting point of the soils

2020 ◽  
Vol 27 (12) ◽  
pp. 13131-13141 ◽  
Author(s):  
Babak Vaheddoost ◽  
Yiqing Guan ◽  
Babak Mohammadi
Keyword(s):  
Optimization Model ◽  
Field Capacity ◽  
Whale Optimization ◽  
Permanent Wilting Point ◽  
Wilting Point

scholarly journals Different scenarios for inverse estimation of soil hydraulic parameters from double-ring infiltrometer data using HYDRUS-2D/3D

2016 ◽  
Vol 30 (2) ◽  
pp. 203-210 ◽  
Author(s):  
Parisa Mashayekhi ◽  
Shoja Ghorbani-Dashtaki ◽  
Mohammad Reza Mosaddeghi ◽  
Hossein Shirani ◽  
Ali Reza Mohammadi Nodoushan
Keyword(s):  
Additional Data ◽  
Field Capacity ◽  
Hydraulic Parameters ◽  
Double Ring ◽  
Cumulative Infiltration ◽  
Permanent Wilting Point ◽  
Soil Hydraulic Parameters ◽  
Simulation Error ◽  
Soil Hydraulic ◽  
Wilting Point

AbstractIn this study, HYDRUS-2D/3D was used to simulate ponded infiltration through double-ring infiltrometers into a hypothetical loamy soil profile. Twelve scenarios of inverse modelling (divided into three groups) were considered for estimation of Mualem-van Genuchten hydraulic parameters. In the first group, simulation was carried out solely using cumulative infiltration data. In the second group, cumulative infiltration data plus water content ath= −330 cm (field capacity) were used as inputs. In the third group, cumulative infiltration data plus water contents ath= −330 cm (field capacity) andh= −15 000 cm (permanent wilting point) were used simultaneously as predictors. The results showed that numerical inverse modelling of the double-ring infiltrometer data provided a reliable alternative method for determining soil hydraulic parameters. The results also indicated that by reducing the number of hydraulic parameters involved in the optimization process, the simulation error is reduced. The best one in infiltration simulation which parametersα,n, andKswere optimized using the infiltration data and field capacity as inputs. Including field capacity as additional data was important for better optimization/definition of soil hydraulic functions, but using field capacity and permanent wilting point simultaneously as additional data increased the simulation error.

scholarly journals   Effects of compost on water availability and gas exchange in tomato during drought and recovery

2012 ◽  
Vol 58 (No. 11) ◽  
pp. 495-502 ◽  
Author(s):  
T.-T. Nguyen ◽  
S. Fuentes ◽  
P. Marschner
Keyword(s):  
Drought Stress ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Water Supply ◽  
Water Availability ◽  
Field Capacity ◽  
Tomato Plants ◽  
Permanent Wilting Point ◽  
Water Treatments ◽  
Wilting Point

Compost can increase soil water availability and nutrient uptake by plants, but it is not clear whether it can also improve the ability of plants to recover after drought stress. Tomato plants (Lycopersicon esculentum L.) were grown in sandy soil without compost or with compost either incorporated or mulched. There were two water treatments: (i) plants grown under sufficient water supply throughout the experiment and (ii) plants grown with sufficient water supply until day 33 after which water was withheld until stomatal conductance was close to zero. Compost addition increased water content at both field capacity and permanent wilting point, but only incorporated compost increased total available water. Compost addition increased shoot and root growth under well-watered and drought stressed conditions with a greater effect by incorporated compost. At sufficient water supply, the rates of photosynthesis and transpiration were similar in all treatments. Drought stressed plants with incorporated compost wilted earlier than control plants, whereas mulched compost increased water availability to plants and hence the number of days until wilting. Photosynthesis and transpiration recovered faster in plants grown with incorporated compost compared to other treatments. The rapid recovery of plants after drought with incorporated compost could be due to their greater root length.

Application of firefly algorithm-based support vector machines for prediction of field capacity and permanent wilting point

2017 ◽  
Vol 172 ◽  
pp. 32-38 ◽  
Author(s):  
Mohammad Ali Ghorbani ◽  
Shahaboddin Shamshirband ◽  
Davoud Zare Haghi ◽  
Atefe Azani ◽  
Hossein Bonakdari ◽  
...  
Keyword(s):  
Support Vector Machines ◽  
Firefly Algorithm ◽  
Field Capacity ◽  
Support Vector ◽  
Vector Machines ◽  
Permanent Wilting Point ◽  
Wilting Point

scholarly journals MODELOS DE CURVA DE RETENÇÃO DE ÁGUA NO SOLO

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 115 ◽  
Author(s):  
Roberto Filgueiras ◽  
Vinicius Mendes Rodrigues de Oliveira ◽  
Fernando França da Cunha ◽  
Everardo Chartuni Mantovani ◽  
Epitácio Jose de Souza
Keyword(s):  
Potential Field ◽  
Water Retention ◽  
Field Capacity ◽  
Water Retention Curve ◽  
Soil Water Retention Curve ◽  
Soil Water Retention ◽  
Retention Curve ◽  
Permanent Wilting Point ◽  
Van Genuchten Model ◽  
Wilting Point

MODELOS DE CURVA DE RETENÇÃO DE ÁGUA NO SOLO  ROBERTO FILGUEIRAS¹; VINICIUS MENDES RODRIGUES DE OLIVEIRA²; FERNANDO FRANÇA DA CUNHA³; EVERARDO CHARTUNI MANTOVANI³ E EPITÁCIO JOSE DE SOUZA4 1 Doutorando em Engenharia Agrícola, Universidade Federal de Viçosa. Viçosa, MG. Email: [email protected]²    Doutorando em Engenharia Agrícola, Universidade Federal de Viçosa. Viçosa, MG³    Prof. Dr. Departamento de Engenharia Agrícola, Universidade Federal de Viçosa. Viçosa, MG4      Doutorando em Agronomia (Ciência do Solo), UNESP. Ilha Solteira, SP.  1 RESUMO  O objetivo deste trabalho foi comparar a umidade na capacidade de campo e ponto de murcha permanente obtida com os modelos de obtenção da curva de retenção de água no solo de van Genuchten e potencial e ainda comparar os valores de capacidade de campo obtidos com a tensão de 6 e 33 kPa. Para isto ajustaram-se os modelos van Genuchten e potencial para as tensões de 10, 30, 50, 100, 500 e 1500 kPa, através da câmara de Richards. Posteriormente, encontrou-se os valores de umidade para as tensões na capacidade de campo (6 e 33 kPa) e ponto de murcha permanente (1500 kPa). Ambos os modelos predisseram a umidade na capacidade de campo a 33 kPa e o ponto de murcha permanente com alta precisão, exatidão e concordância, quando comparado os dois métodos. Palavras-chave: van Genuchten, potencial, capacidade de campo.  FILGUEIRAS R.; DE OLIVEIRA V. M. R.; CUNHA F. F. DA; MANTOVANI E. C.; E. J. DE SOUZA.WATER RETENTION CURVE MODELS IN THE SOIL       2 ABSTRACT The objective of this study was to compare the moisture at field capacity and permanent wilting point obtained by the models and potential for obtaining the soil water retention curve by van Genuchten, also comparing the field capacity values with the tension of 6 and 33 kPa. Thus, it adjusted the van Genuchten model and potential for voltages of 10, 30, 50, 100, 500 and 1500 kPa through Richards chamber, subsequently finding the moisture values for the voltages at field capacity (6 and 33 kPa) and permanent wilting point (1500 kPa). Both models predicted moisture at field capacity at 33 kPa and the permanent wilting point with high precision, accuracy and harmony, when the two methods are compared. Keywords: van Genuchten , potential, field capacity. 

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