scholarly journals Long-term impact of poultry manure on crop yield, soil and water quality, and crop revenue

2019 ◽  
Vol 252 ◽  
pp. 109582 ◽  
Author(s):  
Natasha L. Hoover ◽  
Ji Yeow Law ◽  
Leigh Ann M. Long ◽  
Ramesh S. Kanwar ◽  
Michelle L. Soupir
Keyword(s):  
Water Quality ◽  
Crop Yield ◽  
Poultry Manure ◽  
Long Term Impact ◽  
Soil And Water

Wet weather water quality modelling of a Portuguese urban catchment: difficulties and benefits

2002 ◽  
Vol 45 (3) ◽  
pp. 131-140 ◽  
Author(s):  
L.M. David ◽  
R.S. Matos
Keyword(s):  
Water Quality ◽  
River Flow ◽  
Integrated Approach ◽  
Integrated Modelling ◽  
Sewer System ◽  
Deterministic Modelling ◽  
Short And Long Term ◽  
Long Term Impact ◽  
The Impact

This paper discusses the use of water quality deterministic modelling together with an integrated approach to assess the impact of urban stormwater discharges into ephemeral watercourses, based on the study of a Portuguese catchment. The description of the main aspects, difficulties and benefits found during data collection and model calibration and verification is presented, and the associated uncertainties and errors discussed. Experimental results showed a strong short- and long-term impact of sewer discharges on rivers, and confirmed deposition, resuspension and transport of pollutants as important processes for the water quality. However, the resuspension of riverbed sediment pollutants during storms was probably more significant than the direct impact of the urban discharges. The HydroWorks™ model was used since it allows for the calculation of pollutant build-up on catchment surfaces and in gully pots, their wash-off, and the deposition and erosion of sediments in sewers. However, it uses several constants, which could not be independently calibrated, increasing the uncertainty already associated with the data. River flows have quite different magnitude from the sewer system overflows, which, together with the difficulties in evaluating river flow rates, makes the integrated modelling approach rather complex and costly.

Assessing the ecological long-term impact of wastewater irrigation on soil and water based on bioassays and chemical analyses

2015 ◽  
Vol 84 ◽  
pp. 33-42 ◽  
Author(s):  
Elisabeth Richter ◽  
Fabian Hecht ◽  
Nadine Schnellbacher ◽  
Thomas A. Ternes ◽  
Arne Wick ◽  
...  
Keyword(s):  
Wastewater Irrigation ◽  
Chemical Analyses ◽  
Water Based ◽  
Long Term Impact ◽  
Soil And Water

scholarly journals A study of the use and impacts of LifeStraw™ in a settlement camp in southern Gezira, Sudan

2009 ◽  
Vol 7 (3) ◽  
pp. 478-483 ◽  
Author(s):  
Salwa Elsanousi ◽  
Samira Abdelrahman ◽  
Ibtisam Elshiekh ◽  
Magda Elhadi ◽  
Ahmed Mohamadani ◽  
...  
Keyword(s):  
Water Quality ◽  
Regional Hospital ◽  
Community Survey ◽  
Significant Decline ◽  
Community Clinic ◽  
Long Term Impact

This paper reports a study of the LifeStraw™ in El-Masraf camp within Gezira State, Sudan. A total of 647 eligible subjects participated in the study. Two week incidence of diarrhoeal rates were estimated by a community survey some four months before and again four months after provision of the LifeStraw™. In addition counts were kept of people attending at the community clinic with diarrhoea. Compliance rates were good with 86.5% of people saying they always used it and only 3.7% saying they had never used it. In a before implementation survey 15.3% of participants reported diarrhoea in the previous 2 weeks compared with only 2.3% in a survey after implementation. Similarly 58 people presented to the clinic as a new case of diarrhoea in the four months before compared with only six in the four months after implementation. When compared with diarrhoeal attendances at the regional hospital, this was a statistically significant decline in attendances (p<0.0001). The LifeStraw™ is likely to find a role as an adjunct to water quality interventions aimed at the home. However, more research is needed to assess the long-term impact and uptake of these devices before their definitive value can be assessed.

Evaluation of the Root Zone Water Quality Model (RZWQM) for Southern Ontario: Part II. Simulating Long-Term Effects of Nitrogen Management Practices on Crop Yield and Subsurface Drainage Water Quality

2007 ◽  
Vol 42 (3) ◽  
pp. 219-230 ◽  
Author(s):  
Imran Ahmed ◽  
Ramesh Rudra ◽  
Kevin McKague ◽  
Bahram Gharabaghi ◽  
John Ogilvie
Keyword(s):  
Water Quality ◽  
Crop Yield ◽  
Management Practices ◽  
Root Zone ◽  
Sandy Loam ◽  
Drainage Water ◽  
Long Term Effects ◽  
Quality Model ◽  
Loam Soil

Abstract Loss of nitrogen from the agricultural production system is of concern in Ontario. The challenge for researchers and farmers is to fulfill crop water requirements while limiting chemical movement with surface and subsurface runoff. The main objective of this study was to evaluate the long-term effects of current N management practices for corn production for two different soil types using the Root Zone Water Quality Model (RZWQM) for southern Ontario conditions. The model simulated the amount of subsurface tile drainage, residual soil nitrate-nitrogen (NO3-N), NO3-N in subsurface drainage water, and crop yield. The validated RZWQM for silt loam and sandy loam soils showed that the relative long-term effectiveness of the most economic rate of nitrogen (MERN) for corn production fluctuates significantly from year-to-year in response to weather patterns. In addition, soil type had a small but significant effect on the MERN. Side-dress application of N on sandy loam resulted in significant reduction in corn yield and NO3-N loss to shallow groundwater. Also, crop rotation from corn-soybean to corn-soybean-soybean resulted in a greater reduction of NO3-N loads in the tile outflow on silt loam soil than on sandy loam soil. Overall, the RZWQM simulated tile drain flow, NO3-N loss, and crop yield with reasonable accuracy. However, more field work is needed to assist with identifying suitable values for a number of coefficients used in the RZWQM's nutrient component for Ontario conditions.

scholarly journals Implication of Long-Term Terracing Watershed Development on Soil Macronutrients and Crop Production in Maybar Subwatershed, South Wello Zone, Ethiopia

2021 ◽  
Vol 14 ◽  
pp. 117862212110042
Author(s):  
Tilahun Taye ◽  
Awdenegest Moges ◽  
Alemayehu Muluneh ◽  
Muluken Lebay ◽  
Wudu Abiye
Keyword(s):  
Watershed Management ◽  
Crop Yield ◽  
Water Conservation ◽  
Crop Production ◽  
Annual Production ◽  
Data Set ◽  
Deposition Zone ◽  
Pulse Crops ◽  
Soil And Water

Long-term watershed management in Ethiopia was evaluated in various agro-ecologies starting in the 1980s. Our research was carried out to investigate the effects of long-term watershed management on soil macronutrient status and crop production in the Maybar subwatershed terrace positioning system, which has a long-term data set on various aspects, such as hydroclimatology, agriculture, and social studies. Crop yield data were collected from 40 fixed plots of that data set, and soil samples were collected by topo-sequencing of the catchment from the cultivation field based on different terrace position plot arrangements. The results showed higher crop yield and production of biomass in the upper section or deposition zone of soil and water conservation structure than below the structure or loss zone, but did not vary significantly from the annual production potential. The annual production of cereals was marginally decreased, but not pulse crops, reducing the wheat harvest production from the middle to the loss zone (23.8%) rather than the deposition zone to middle portion of the terrace (8.0%). In comparison, to increase the slope position of the terrace, the redaction percentage of pulse crops (field pea and lentil) is greater, because in the first terrace location (upper to middle) and in the second terrace, the output capacity of field pea was reduced by 22.4%. The condition of soil fertility between the 2 consecutive systems for soil and water protection differed from the upper to the lower land positions. Improvement in soil chemical and physical properties relatively increased toward the upper land position. Soil organic matter, available phosphorus, bulk density, and soil moisture content were significantly affected by soil and water conservation structures ( P ⩽ .05). Long-term terrace growth typically has a positive effect on improvements in onsite soil resources and the capacity for crop production. It therefore has a beneficial impact on onsite natural resources, such as enhancing soil macronutrients and increasing productivity in crop yields.

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