The effects of land management on soil fertility and nutrient balance in Kecha and Laguna micro watersheds, Amhara Region, Northwestern, Ethiopia

Lewoyehu, Mekuanint; Alemu, Zinash; Adgo, Enyew

doi:10.1080/23311932.2020.1853996

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…Moreover, nutrient uptake (concentration in plant tissue × yield) might cause differences in soil nutrient balances. For instance, Haileslassie et al (2006); Lewoyehu et al (2020) have been reported 18 and 160 kg ha −1 yr −1 , respectively N uptake by harvested products of teff crop, whereas, from 28 to 37 kg ha −1 yr −1 N uptake was reported in this study by such crop (Table 1). In addition, ammonium fixation in clay minerals may be affect N supplies, availability and balance (Kome et al, 2019).…”

Section: Discussionmentioning

confidence: 41%

Dual benefits of polyacrylamide and other soil amendments: Mitigation of soil nutrient depletion and improvement of use‐efficiency in midland agro‐ecology, Ethiopia

et al. 2022

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Polyacrylamide (PAM) mitigates soil nutrient depletion and increases nutrient utilization; however, the effect of PAM combined with other amendments have not been tested much under field condition. The objective of our study was, therefore, to identify the best combination of amendments that can improve soil nitrogen (N) and phosphorus (P) balances while maximizing utilization efficiency and profitability under teff cultivation. A field experiment was carried out for 2 years in the midland agroecology of Ethiopia. A total of 24 experimental plots were designed using RCBD with three replications. The treatments were PAM (40 kg ha À1 ), biochar (B = 8 t ha À1 ), lime (L = 4 t ha À1 ), gypsum (G = 5 t ha À1 ), PAM+B, PAM+L, PAM+G, and a control.N and P inflows from atmospheric deposition, biological fixation, and fertilizers; and outflows by water erosion, leaching, gaseous emissions, and harvested products were monitored in all plots via NUTrient MONitoring approach. Results showed that all the applied soil amendments improved nutrient balances (8-134%) compared with the control. Of the measured outflows, harvested products (43-60%) and water erosion (14-31%) were the major contributors to N depletion, followed by leaching (15-23%) and gaseous emissions (11-13%). Among the soil amendments, PAM+L appreciably reduced P loss from water erosion (61%); and N losses from erosion, leaching, and emissions by 55, 10, and 3%, respectively; and increased N use efficiency by 31% compared with the control. Moreover, PAM+L provided a net benefit much higher compared with others. Thus, application of PAM+L would be an effective strategy for sustainable agriculture, especially in acidic and degraded dryland areas.

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Section: Discussionmentioning

confidence: 41%

Dual benefits of polyacrylamide and other soil amendments: Mitigation of soil nutrient depletion and improvement of use‐efficiency in midland agro‐ecology, Ethiopia

et al. 2022

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“…Crop land nitrogen-nitrate runoff\leaching is also highly integrated with the rate at which humans operate on the farmland cropping system with the trend of Nfertilizer application rate (Lwimbo et al, 2019). Also wet season nitrogen removal from agricultural soil is integrated to crop land water balance (Guizani et al, 2016;Lewoyehu et al, 2020) and estimation of nitrate from cropland by means of leaching, runoff, and harvest removal is possible based on crop biomass index (Mahmud et al, 2021;Mir et al, 2021;. Estimation of crop land biomass statistical simulation result, can be potentially indicate for rein fed crop land soil mineralized drained soil index for biomass statistics value below 0.25 (FAO ASIS, 2022).…”

Section: Introductionmentioning

confidence: 99%

Modeling canopy water content in the assessment for rainfall induced surface and groundwater nitrate contamination index from cropland N-fertilizer in Bilate downstream

Assa

Bhowmick

Elias

2023

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Crop canopy water content and crop root zone soil water content have been predicted and observed for estimation of crop water balance for the rainy season nitrate runoff and leaching index of the Bilate watershed cropland. For the calibration of earth data observation, the watershed rain gauge station estimated the pattern of rainfall for the main cropping season of crop growth. Cropping season (Apr, May and Jun) monthly mean rainfall between (125mm/month to 165 mm/month) of agro metrological station has predicted time series crop canopy water in the analysis for crop land nitrate-nitrogen leaching/runoff index for the quantification of groundwater and surface runoff nitrate from the Bilate watershed farming zone. May and June were the months in which crops grew in the cropland of the study area, as indicated by the crop biomass statistics from MODIS 006 MOD13Q1-EVI of (Mine 0.19 and Max, 0.57) which is the average crop coefficient Kc for crop growth curve analyzed for model crop parameter. Hyper-spectral indices derived from enhanced vegetation indices (EVI) have been calculated for the analysis of crop zonal biomass statistics (kc) and integrated into the prediction model. The objective of the current research was to predict crop canopy water content in order to determine crop water balance for farmland Nitrogen Nitrate (NO− 3-N) runoff\leaching index for surface and groundwater pollution in the Bilate downstream. The overall predicted result of crop canopy water content has been validated with a regression coefficient (R2) with observed crop root zone soil water content. And the crop land nitrogen balance has been used to confirm the nitrate-nitrogen leaching and runoff index for the study area by comparing the current result with the crop land nitrogen balance.

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“…In their study, water samples from the Ziway River were collected over two years (2014 and 2015) and chemical analysis was determined for nutrient concentrations according to the American Public Health Association (APHA). A similar study by Lewoyehu et al (2020) performed land management in terms of soil fertility and nutrient balance in the Kecha and Laguna watersheds in Northern Ethiopia. In three studies, some water samples were collected and the nutrients estimated.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Impacts of land-use/land-cover changes on nutrient losses in agricultural catchment, southern Ethiopia

2022

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Assessing the impact of land-use/land-cover (LULC) change and nutrient loads on water systems is a key issue, where different water uses raise water quality concerns. This study aimed to enumerate the extent of the LULC change from 1986 to 2018, its measurable impacts on nutrient losses and major pollution areas based on the SWAT in the Bilate catchment, Southern Ethiopia. The sequential uncertainty fitting version two (SUFI-2) algorithm in SWAT-CUP was used in calibration and validation. Calibration and validation showed good agreement between observed and simulated values. Results showed that significant changes in nutrient loss occurred, following the direction of LULC changes between 1986–2002 and 2002–2018. The increase in agricultural land and built-up area accounted for 9.46% and 0.69% of the catchment area, respectively. The total phosphorus and nitrogen loads reached 2.52–1.27 kg/ha and 15.41–31.69 kg/ha between 1986–2002 and 2002–2018. Sub-basins 11, 14, 16, 17, 18 and 55 were the most important areas with nutrient pollution sources identified. The nutrient loads reduce water quality and fish productivity in Lake Abaya. The results of this study improved the understanding of nutrient loading from LULC changes and provided the required knowledge on integrated LULC and water quality management.

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The effects of land management on soil fertility and nutrient balance in Kecha and Laguna micro watersheds, Amhara Region, Northwestern, Ethiopia

Cited by 8 publications

References 40 publications

Dual benefits of polyacrylamide and other soil amendments: Mitigation of soil nutrient depletion and improvement of use‐efficiency in midland agro‐ecology, Ethiopia

Dual benefits of polyacrylamide and other soil amendments: Mitigation of soil nutrient depletion and improvement of use‐efficiency in midland agro‐ecology, Ethiopia

Modeling canopy water content in the assessment for rainfall induced surface and groundwater nitrate contamination index from cropland N-fertilizer in Bilate downstream

Impacts of land-use/land-cover changes on nutrient losses in agricultural catchment, southern Ethiopia

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