Use of the SWB-Sci model for nitrogen management in sludge-amended land

Tesfamariam, Eyob Habte; Annandale, J. G.; Steyn, J. M.; Stirzaker, Richard; Mbakwe, Ikenna

doi:10.1016/j.agwat.2015.01.023

Cited by 10 publications

(6 citation statements)

References 37 publications

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“…It can be used either as a nutrient source (dried or dewatered biosolids) and or supplementary water for irrigation (liquid wastewater). When applied as irrigation water it would meet both crop-water requirements and crop-nutrients needs (Tesfamariam et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Agricultural use suitability assessment and characterization of municipal liquid sludge: Based on South Africa survey

Badza

Tesfamariam

Cogger

2020

Science of The Total Environment

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Section: Introductionmentioning

confidence: 99%

Agricultural use suitability assessment and characterization of municipal liquid sludge: Based on South Africa survey

Badza

Tesfamariam

Cogger

2020

Science of The Total Environment

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“…One factor considered when applying sludge to agricultural soils is the amount of N that will be available to the plant during a given time period (growing season) [18,19]. The release of plant available N from organic sources such as sewage sludge applied to agricultural soils is a function of the soil temperature and soil water content [19,20]. Sewage sludge is a slow-release fertilizer compared to inorganic fertilizers.…”

Section: Assumptions On Economic Value Of Sludge As Fertilizermentioning

confidence: 99%

“…The plant availability of N from sludge for the current study is estimated based on laboratory incubation studies conducted by [21] adjusted to site-specific release rates using the Swb-Sci model [22]. The model was previously validated with independent data sets [19]. This study considered an anaerobically digested ferric chloride treated sludge, which was used to calibrate and validate the SWB-Sci model.…”

Section: Assumptions On Economic Value Of Sludge As Fertilizermentioning

confidence: 99%

Cost–Benefit Analysis of Municipal Sludge as a Low-Grade Nutrient Source: A Case Study from South Africa

et al. 2020

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Municipal sludge has economic value as a low-grade fertilizer as it consists of appreciable amounts of the macro and micronutrients. When using sludge as fertilizer, the economic aspect should be taken into account. In this study, the following specific objectives were identified: (a) to investigate the economic feasibility of using sludge as a fertilizer; (b) to estimate the maximum economic distance sludge can be transported as a fertilizer; and (c) to test the economic feasibility of selling sludge using commercial inorganic fertilizer as a bench mark. The study showed that for anaerobically digested, paddy dried, municipal sludge consisting of 3% N, 2% P, and 0.3% K the economic feasibility of transporting the sludge was limited to a diameter of 20 km in the arid zone, 28 km in the semi-arid zone, 51 km in the sub humid zone, 66 km in the humid zone, and 75 km in the super-humid zone. Therefore, the economic feasibility of using sludge as a substitute for or complementary to commercial inorganic fertilizer is dictated by the distance between the wastewater care work and the farm, sludge nutrient concentration, agro-ecological zone (rain and temperature), and the real-time commercial inorganic fertilizer price.

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“…This paper specifically looked into the Soil Water Balance (SWB) model because it is widely used in southern Africa. The SWB model is a mechanistic crop growth model that is well established and widely used [ 46 , 47 , 49 , 50 , 51 , 52 , 53 , 54 ]. SWB is designed to simulate crop growth, water use and soil water balance components from weather, soil and crop data.…”

Section: Introductionmentioning

confidence: 99%

Crop Model Parameterisation of Three Important Pearl Millet Varieties for Improved Water Use and Yield Estimation

Ausiku

Annandale

Steyn

et al. 2022

Plants

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Pearl millet is an important crop for food security in Asia and Africa’s arid and semi-arid regions. It is widely grown as a staple cereal grain for human consumption and livestock fodder. Mechanistic crop growth and water balance models are useful to forecast crop production and water use. However, very few studies have been devoted to the development of the model parameters needed for such simulations for pearl millet. The objectives of the study were to determine crop-specific model parameters for each of three pearl millet varieties (landrace, hybrid, and improved), as well as to calibrate and validate the Soil Water Balance (SWB) model for predicting pearl millet production and water use based on weather data. The SWB was chosen because it is widely used in southern Africa; however, the developed parameters should benefit other models as well. The presented crop-specific parameter values were derived from field observations and literature. Varieties with different phenology, maturity dates and tillering habits were grown under well-watered and well-fertilised conditions for calibration purposes. The calibrated model was used to predict biomass production, grain yield and crop water use. The hybrid’s water use efficiency was higher than that of the landrace and improved variety.

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Use of the SWB-Sci model for nitrogen management in sludge-amended land

Cited by 10 publications

References 37 publications

Agricultural use suitability assessment and characterization of municipal liquid sludge: Based on South Africa survey

Agricultural use suitability assessment and characterization of municipal liquid sludge: Based on South Africa survey

Cost–Benefit Analysis of Municipal Sludge as a Low-Grade Nutrient Source: A Case Study from South Africa

Crop Model Parameterisation of Three Important Pearl Millet Varieties for Improved Water Use and Yield Estimation

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