Leaching irrigated saline sandy to sandy loam apedal soils with water of a constant salinity

Barnard, Johannes Hendrikus; Rensburg, L. van; Bennie, A. T.P.

doi:10.1007/s00271-009-0175-y

Cited by 37 publications

(18 citation statements)

References 14 publications

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“…The result also shows that the salinity removal profile in both irrigation scenarios is more or less similar. Similar observations of salinity reduction with saline water were made by Barnard et al (2010). However, they reported an exponential function to describe salt removal as a function of drainage water per unit soil depth.…”

Section: Soil Salinity Distributionsupporting

confidence: 64%

Modelling soil water and salt dynamics under pulsed and continuous surface drip irrigation of almond and implications of system design

et al. 2011

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The HYDRUS-2D model was experimentally verified for water and salinity distribution during the profile establishment stage (33 days) of almond under pulsed and continuous drip irrigation. The model simulated values of water content obtained at different lateral distances (0, 20, 40, 60, 100 cm) from a dripper at 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140 and 160 cm soil depths at different times (5, 12, 19, 26 and 33 days of profile establishment) were compared with neutron probe measured values under both irrigation scenarios. The model closely predicted water content distribution at all distances, times and soil depths as RMSE values ranged between 0.017 and 0.049. The measured mean soil water salinity (ECsw) at 25 cm from the dripper at 30, 60, 90 and 150 cm soil depth also matched well with the predicted values. A correlation of 0.97 in pulsed and 0.98 in continuous drip systems with measured values indicated the model closely predicted total salts in the root zone. Thus, HYDRUS-2D successfully simulated the change in soil water content and soil water salinity in both the wetting pattern and in the flow domain. The initial mean ECsw below the dripper in pulsed (5.25 dSm -1 ) and continuous (6.07 dSm -1 ) irrigations decreased to 1.31 and 1.36 dSm -1 , respectively, showing a respective 75.1 and 77.6% decrease in the initial salinity. The power function [y = ax -b ] best described the mathematical relationship between salt removal from the soil profile as a function of irrigation time under both irrigation scenarios. Contrary to other studies, higher leaching fraction (6.4-43.1%) was recorded in pulsed than continuous (1.1-35.1%) irrigation with the same amount of applied water which was brought about by the variation in initial soil water content and time of irrigation application. It was pertinent to note that a small (0.012) increase in mean antecedent water content (h i ) brought about 8.25-9.06% increase in the leaching fraction during the profile establishment irrespective of the emitter geometry, discharge rate, and irrigation scenario. Under similar h i , water applied at a higher discharge rate (3.876 Lh -1 ) has resulted in slightly higher leaching fraction than at a low discharge rate (1.91 Lh -1 ) under pulsing only owing to the variation in time of irrigation application. The influence of pulsing on soil water content, salinity distribution, and drainage flux vanished completely when irrigation was applied daily on the basis of crop evapotranspiration (ETc) with a suitable leaching fraction. Therefore, antecedent soil water content and scheduling or duration of water application play a significant role in the design of drip irrigation systems for light textured soils. These factors are the major driving force to move water and solutes within the soil profile and may influence the off-site impacts such as drainage flux and pollution of the groundwater.

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Section: Soil Salinity Distributionsupporting

confidence: 64%

Modelling soil water and salt dynamics under pulsed and continuous surface drip irrigation of almond and implications of system design

et al. 2011

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“…However, rainfall alone is often insufficient to move salt downward through the soil profile. Therefore, the application of extra-irrigation water to promote salt leaching and maintain agricultural productivity has become a common practice [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Soil Salinization Due to Tomato Cultivation in Mediterranean Climate Conditions

Libutti

Cammerino

Monteleone

2018

Water

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The Mediterranean climate is marked by arid climate conditions in summer; therefore, crop irrigation is crucial to sustain plant growth and productivity in this season. If groundwater is utilized for irrigation, an impressive water pumping system is needed to satisfy crop water requirements at catchment scale. Consequently, irrigation water quality gets worse, specifically considering groundwater salinization near the coastal areas due to seawater intrusion, as well as triggering soil salinization. With reference to an agricultural coastal area in the Mediterranean basin (southern Italy), close to the Adriatic Sea, an assessment of soil salinization risk due to processing tomato cultivation was carried out. A simulation model was first arranged, then validated, and finally applied to perform a water and salt balance along a representative soil profile on a daily basis. In this regard, long-term weather data and physical soil characteristics of the considered area (both taken from international databases) were utilized in applying the model, as well as considering three salinity levels of irrigation water. Based on the climatic analysis performed and the model outputs, the probability of soil salinity came out very high, such as to seriously threaten tomato yield. Autumn–winter rainfall frequently proved to be insufficient to leach excess salts away from the soil profile and reach sustainable conditions of tomato cultivation. Therefore, alternative cropping strategies were investigated.

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“…The silt and clay contents for this soil ranged from 2 to 4% and 8 to 20%, respectively. The textures of these soils are representative of about 60% of the irrigated land in South Africa (Barnard et al, 2010).…”

Section: Soil Characteristicsmentioning

confidence: 99%

Influence of soils and different phases of reproductive growth stage on transpiration efficiency of irrigated canola

Tfwala

Haka

Rensburg

et al. 2020

Irrigation and Drainage

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Much has been reported on the agronomic aspects of canola (Brassica napus L.), but there is a lack of information on the crop's transpiration (T). The objective of this study was to evaluate the influence of soils and growth periods on the T, transpiration efficiency (TE) and transpiration efficiency coefficient (TEC) of canola under irrigation. Twenty-four lysimeters (2.5 m 2) were used for the study. The experimental treatments comprised two soil forms and four growth phases during the reproductive stage, all replicated three times. Irrigation was applied weekly through a surface drip system and a water table was maintained at 1200 mm from the surface through subirrigation. Soil water content was monitored using a neutron probe. The contribution of an accessible water table was up to 60% of the total T requirement of the crop during the investigation period. TE, calculated as above-ground biomass per unit transpiration, ranged between 2.81 and 3.32 g m −2 mm −1. TEC, obtained by normalizing TE to the vapour pressure deficit, resulted in values between 3.82 and 4.99 g kPa mm −1. Both TE and TEC were significantly different between growth periods and not amongst soils.

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Leaching irrigated saline sandy to sandy loam apedal soils with water of a constant salinity

Cited by 37 publications

References 14 publications

Modelling soil water and salt dynamics under pulsed and continuous surface drip irrigation of almond and implications of system design

Modelling soil water and salt dynamics under pulsed and continuous surface drip irrigation of almond and implications of system design

Risk Assessment of Soil Salinization Due to Tomato Cultivation in Mediterranean Climate Conditions

Influence of soils and different phases of reproductive growth stage on transpiration efficiency of irrigated canola

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