Estimating the electrical conductivity of saturated paste extracts from 1:5 soil, water suspensions and texture

Understanding the spatial soil salinity aids farmers and researchers in identifying areas in the field where special management practices are required. Apparent electrical conductivity measured by electromagnetic induction instrument in a fairly quick manner has been widely used to estimate spatial soil salinity. However, methods used for this purpose are mostly a series of interpolation algorithms. In this study, sequential Gaussian simulation (SGS) and sequential Gaussian co-simulation (SGCS) algorithms were applied for assessing the prediction accuracy and uncertainty of soil salinity with apparent electrical conductivity as auxiliary variable. Results showed that the spatial patterns of soil salinity generated by SGS and SGCS algorithms showed consistency with the measured values. The profile distribution of soil salinity was characterized by increasing with depth with medium salinization (EC e 4-8 dS/m) as the predominant salinization class. SGCS algorithm privileged SGS algorithm with smaller root mean square error according to the generated realizations. In addition, SGCS algorithm had larger proportions of true values falling within probability intervals and narrower range of probability intervals than SGS algorithm. We concluded that SGCS algorithm had better performance in modeling local uncertainty and propagating spatial uncertainty. The inclusion of auxiliary variable contributed to prediction capability and uncertainty modeling when using densely auxiliary variable as the covariate to predict the sparse target variable.

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“…This equation is consistent with the relationships proposed by Slavich and Petterson (1993) and Taylor (1991) for soil type of silt loam.…”

Section: Laboratory Analysissupporting

confidence: 92%

Accuracy and uncertainty assessment on geostatistical simulation of soil salinity in a coastal farmland using auxiliary variable

Yao

Yang

Shao

2012

Environ Monit Assess

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“…The duration of the stress treatment was almost 3 months (11 weeks). Soil EC was measured at the end of the experiment by the saturated paste method (Slavich and Petterson 1993) in both salt treatment and control. The average EC of the substrate in the salt treatment was approx.…”

Section: Experimental Design For Salt Stress Trialsmentioning

confidence: 99%

Relationship between survival and yield related traits in Solanum pimpinellifolium under salt stress

et al. 2012

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A subset of the Solanum pimpinellifolium collection maintained by AVRDC-The World Vegetable Center, Taiwan was evaluated to assess effects of salt stress on physiological traits and yield-related traits with the aim of identifying potential S. pimpi nellifolium accessions useful for salt tolerance breed ing in tomato. We undertook a comparative analysis of yield and plant survival traits under normal and salt stress conditions to obtain a first indication of the crucial traits associated with salt tolerance in S. pimpinellifolium. Although most traits of S. pimpinellifolium accessions showed a similar percent decrease in mean under salt stress compared with the cultivated checks, the former exhibited a wide range for all traits, suggesting great genetic diversity that can be exploited for the identification of salt tolerant genotypes. Genetic variability for yield and survival traits under salt stress was quantitative with low to moderate heritability. Results of correlation and path coefficient analysis revealed no correlation between any of the physiological traits with yield-related traits indicating that the ability to survive and yield under salt stress are two independent sets of traits in S. pimpinellifolium. Results of the path analysis along with heritability and genetic advance showed that shoot dry weight and K/Na ratio are the two most critical component traits for survival, while fruit number is critical for yield per plant. The large S. pimpinellifolium panel evaluated in this study revealed five genotypes possessing better survival traits, seven genotypes with good yield traits, and two genotypes combining both superior survival and yield traits under salt stress.

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“…Yield was affected from an electrical conductivity of 1:5 solution extract (EC 1:5 ) of 4.3 dS·m -1 and reached only half-maximum yield for EC 1:5 of 8 dS·m -1 . According to many relations established for the estimation of the electrical conductivity of saturation extracts from the electrical conductivity of 1:5 soil / water suspensions, e.g., [24,25], including similar coarse-textured soils with gypsum [31], or even considering the electrical conductivity of the water table as a proxy, the threshold values would be much higher than those established by FAO [6] for date palm. However, these relations are location-specific and can hardly be reliably…”

Section: Influence Of Environmental Constraints On Date Palm Yieldmentioning

confidence: 99%

“…Electrical conductivity was measured by the 1:5 soilto-water ratio extract method (EC 1:5 ) because large uncertainty can be associated with the water content of the saturated paste in sandy soils [24]. A highly significant relationship generally exists between EC 1:5 and EC e in saturated paste [25], and no significant bias can be introduced since soil texture is very homogeneous.…”

Section: Datamentioning

confidence: 99%

A survey of the combined effects of waterlogging and salinity on fruit yield in the date palm groves of the Wargla basin, Algeria

Bouhoun¹,

Marlet²,

Brinis³

et al. 2011

Fruits

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A survey of the combined effects of waterlogging and salinity on fruit yield in the date palm groves of the Wargla basin, Algeria.Abstract --Introduction. While researchers have paid considerable attention to the effect of soil salinity on crop yield, methodological impediments remain when salinity is combined with other growth factors, especially in farmers' fields. A specific methodology was adapted to assess the effect of waterlogging and salinity on date palm yield (Phoenix dactylifera L. cv. Deglet Noor). Materials and methods. Date palm yield, water table depth, irrigation water, groundwater and soil salinity were measured in 167 field plots located in five irrigation sectors of the Wargla basin (Algeria). Variance analysis and a boundary line approach were combined to analyze actual and potential yields according to environmental stresses. Results and discussion. High soil salinity resulted from saline irrigation water and a shallow water table. Actual yield decreased with the increase in soil salinity, the decrease in water table depth, and the presence of a gypsum-cemented horizon within the soil profile. The significant effect of the interaction between water table depth and soil salinity showed that the crop responded to the most severe stress rather than to combinations of the individual effects. Potential yield was assessed according to classes of water table depth, soil salinity and the occurrence of a gypsum-cemented horizon. The relationship between soil salinity and potential yield was calibrated according to two models. The limiting factors in order of decreasing importance were shallow water table, high soil salinity and occurrence of a gypsum-cemented horizon for 38.3%, 16.8% and 2.4% of the field plots, respectively; there was no limiting factor for 42.5% of the field plots. In certain sectors, actual yields remained far below potential yields and the additional effect of irrigation water salinity could thus be considered.Algeria / Phoenix dactylifera / yields / waterlogging / soil salinity Enquête sur les effets combinés de l'engorgement et de la salinité sur le rendement des palmeraies du bassin d'Ouargla, en Algérie.Résumé --Introduction. Alors que les chercheurs ont porté une très grande attention à l'effet de la salinité du sol sur le rendement des cultures, des obstacles méthodologiques demeurent lorsque la salinité est combinée à d'autres facteurs de croissance, en particulier en conditions réelles dans les parcelles des agriculteurs. Une méthodologie spécifique a été adaptée pour évaluer l'effet de l'engorgement et de la salinité sur le rendement du palmier dattier (Phoenix dactylifera L. cv. Deglet Nour). Matériel et méthodes. Le rendement du palmier dattier, la profondeur de la nappe phréatique, l'eau d'irrigation, les eaux souterraines et la salinité du sol ont été mesurés dans 167 parcelles situées dans cinq secteurs d'irrigation du bassin d'Ouargla (Algérie). Une analyse de variance et une approche par la méthode des courbes-enveloppes ont été combinées pour évaluer les rendemen...

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Estimating the electrical conductivity of saturated paste extracts from 1:5 soil, water suspensions and texture

Cited by 205 publications

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Accuracy and uncertainty assessment on geostatistical simulation of soil salinity in a coastal farmland using auxiliary variable

Accuracy and uncertainty assessment on geostatistical simulation of soil salinity in a coastal farmland using auxiliary variable

Relationship between survival and yield related traits in Solanum pimpinellifolium under salt stress

A survey of the combined effects of waterlogging and salinity on fruit yield in the date palm groves of the Wargla basin, Algeria

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