Nutrient and sediment runoff from agricultural landscapes with varying suites of conservation practices in the Mississippi Alluvial Valley

2018 ◽  
Vol 73 (1) ◽  
pp. 75-85 ◽  
Author(s):  
B.H. Baker ◽  
J.M. Prince Czarnecki ◽  
A.R. Omer ◽  
C.A. Aldridge ◽  
R. Kröger ◽  
...  
2017 ◽  
Vol 18 (4) ◽  
pp. 1396-1405 ◽  
Author(s):  
A. R. Omer ◽  
M. T. Moore ◽  
L. J. Krutz ◽  
R. Kröger ◽  
J. M. Prince Czarnecki ◽  
...  

Abstract Within the Lower Mississippi Alluvial Valley, conservation practices are being utilized to mitigate nutrient loading to streams from agricultural landscapes. This study was conducted to determine the potential to use solids, phosphorus (P) and nitrogen (N) captured by tailwater recovery (TWR) systems for reuse onto production fields through irrigation applications. Seven TWR systems were assessed for seasonal changes in nutrient concentrations and application loads. Samples were collected every three weeks from 2013 to 2015 for seasonal analyses and weekly during the 2014 and 2015 growing seasons for nutrient load analyses. Water samples collected in spring contained greater concentrations of solids than samples collected in winter and summer. In addition, spring samples contained greater concentrations of nitrate–nitrite than samples collected in all other seasons, and spring samples also contained higher ammonium than summer and fall samples. Mean nutrient loads per hectare recycled onto the landscape for an irrigation season were 325.10 kg ha−1 solids, 0.86 kg ha−1 P, and 7.26 kg ha−1 N, with the N being 77% organic. TWR systems can be used to recycle solids, P and N onto agricultural landscapes through irrigation events; however, nutrient loads will not be sufficient to alter agronomic fertilizer recommendations.


2011 ◽  
Vol 21 (sp1) ◽  
pp. S31-S48 ◽  
Author(s):  
Stephen Faulkner ◽  
Wylie Barrow ◽  
Bob Keeland ◽  
Susan Walls ◽  
David Telesco

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Mamush Masha ◽  
Teshome Yirgu ◽  
Mulugeta Debele ◽  
Mengie Belayneh

Soil and water conservation (SWC) is being advocated as an integral part of agricultural land management as it not only controls/minimizes soil erosion but also restores/rehabilitates the degraded lands. The purpose of this study was to evaluate the impact of soil and water conservation practices in improving soil fertility in the agricultural landscapes of the Damota area, southern Ethiopia. Forty-eight soil samples (both disturbed and core samples) were collected from the conserved and adjacent nonconserved plots. The significance analysis test was performed using analysis of variance. The result of the study showed that higher mean values of soil physicochemical properties were observed in the conserved plot than its nonconserved counterpart. The mean differences of organic carbon, total nitrogen, cation exchange capacity, and exchangeable K+ and Ca2+ between conserved and nonconserved plots were statistically significant at the P < 0.01 level. Besides, available phosphorous and bulk density were significant at P < 0.05 , but the effect of SWC practices was not found significant on soil texture, soil pH, and exchangeable Na+ and Mg2+ content of the soil in the Damota area. Community-based soil and water conservation practices have improved the soil fertility in agricultural landscapes, although significant results have been observed in some fertility indicators. Therefore, strengthening the implementation of conservation measures by participating in all stakeholders is recommended. Supporting physical structures by agronomic and vegetative measures and continued maintenance can bring better results.


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