Impact of Variable Rate Fertilization on Subsurface Water Contamination in Wild Blueberry Cropping System

Saleem, Shoaib Rashid; Zaman, Qamar; Schumann, Arnold W.; Madani, Ali; Farooque, Aitazaz A.; Percival, David

doi:10.13031/2013.42653

Cited by 12 publications

(3 citation statements)

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“…Soil erosion and nutrient loss studies using runoff plots have been more effectively utilized in China, the United States and Europe [20][21][22]. Runoff plots were used to explore the effects of no-till practices on reducing agricultural nonpoint source pollution [23] and the effects of variable versus uniform fertilizer application on nutrient loss [24]. The variables in runoff plots are easier to control than in small watersheds.…”

Section: Introductionmentioning

confidence: 99%

Study on characteristics of soil and nutrient losses in Sunjiagou small watershed in cold black soil area

Dai

Wang

et al. 2023

PLoS ONE

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Investigating the impact of different factors on soil and nutrient loss and suggesting viable control measures is currently a significant concern. This study aims to examine the variations in soil erosion, as well as nitrogen and phosphorus loss, in the core area of the typical hilly diffuse Blackland erosion control. To achieve this, runoff plots with slopes of 3° and 5° were set up in the Sunjiagou sub-basin, located in the upper reaches of the Feiketu River. These plots were subjected to various soil and water conservation measures, along with different levels of vegetation cover. This study aims to analyze the soil and nutrient loss patterns and characteristics in each runoff plot during the natural rainfall events occurring between 2020 and 2022. The results show that soil and nutrient losses are highly significantly and positively correlated with rainfall intensity. The RUSLE model demonstrates a better fit for both cross ridge tillage and bare ground. The loss of nitrogen was much more significant than that of phosphorus, and nitrate nitrogen is the main form of nitrogen loss. Nitrogen loss is mainly dominated by nitrate nitrogen (NN), which is easily soluble in water and constantly migrates with runoff due to the negatively charged NN (NN accounted for 45.2% ~ 81.8% of total nitrogen (TN)). In contrast, the positively charged ammonia nitrogen (AN) is more stable in combination with the soil; large losses only occur under severe sediment erosion. Phosphorus is easily attached to sediment, and the high sediment production leads to a more serious loss of total phosphorus (PP) in the particulate state (PP accounts for 72.7% ~ 96.2% of total phosphorus (TP)). Changing longitudinal ridge tillage to cross ridge tillage and planting vegetation with better water retention and sediment fixation as plant hedges can effectively prevent the loss of soil, runoff, nitrogen, and phosphorus.

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Section: Introductionmentioning

confidence: 99%

Study on characteristics of soil and nutrient losses in Sunjiagou small watershed in cold black soil area

Dai

Wang

et al. 2023

PLoS ONE

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“…In recent decades, farming activities in agricultural watersheds have become a major concern for water quantity and quality [5,6]. Conventional farming practices in some locations were to apply fertilizers uniformly at high rates without considering the crop and soil requirements [7][8][9] resulting in leaching of excess nutrients to groundwater especially after a heavy rainfall event [9]. However, more farmers are moving towards better nutrient management considering the negative impacts of high fertilizer rates on crop productivity and the environment [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Climate Change and Different Crop Rotation Scenarios on Groundwater Nitrate Concentrations in a Sandy Aquifer

et al. 2020

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Nitrate in groundwater is a major concern in agricultural sub-watersheds. This study assessed the impacts of future climate and agricultural land use changes on groundwater nitrate concentrations in an agricultural sub-watershed (Norfolk site) in southern Ontario, Canada. A fully integrated hydrologic model (HydroGeoSphere) was used in combination with the root zone water quality model (RZWQM2) (shallow zone) to develop water flow and nitrate transport models. Three climate change models and three crop rotations (corn-soybean rotation, continuous corn, corn-soybean-winter wheat-red clover rotation) were used to evaluate the potential impact on groundwater quality (nine predictive scenarios). The selected climate change scenarios yielded less water availability in the future period than in the reference period (past conditions). The simulated nitrate nitrogen (Nitrate-N) concentrations were lower during the future period than the reference period. The continuous corn land use scenario produced higher Nitrate-N concentrations compared to the base case (corn-soybean rotation). However, the best management practices (BMP) scenario (corn-soybean-winter wheat-red clover rotation) produced significantly lower groundwater nitrate concentrations. BMPs, such as the one examined herein, should be adopted to reduce potential negative impacts of future climate change on groundwater quality, especially in vulnerable settings. These findings are important for water and land managers, to mitigate future impacts of nutrient transport on groundwater quality under a changing climate.

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“…Crop responses to N often varies spatially and temporally within a field (Vetch et al, 1995;Raun & Johnson, 1999). Management practice of variable rate application (VRA) of N, which applies N site-specifically based on the crop needs, could generate economic benefit for producers and create positive environmental impacts (Yang et al, 2000;Koch et al, 2004;Saleem et al, 2013a;2013b).…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of a Variable-Rate Fertilizer Applicator

Sui¹

2019

JAS

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The objective of this study was to test the performance of a Field-IQ sprayer control system which was interfaced with a John Deere liquid fertilizer applicator. The sprayer control system includes Case IH FM-1000 display integrated with DGPS, Field-IQ spray control with full harness, flowmeter and auto-range valve, and the pump. Tap water was used to simulate the UAN 32% nitrogen fertilizer solution in the test. A total of 120 samples from 8 rows of the applicator in 5 application rates (34, 67, 101, 135, and 168 kg/ha) were collected, and the data were analyzed for application uniformity and application rate accuracy of the system. Results showed the greatest variation from the application rate baseline among the rows was 10.1% and occurred at a swath-end row with the lowest application rate of 34 kg/ha. The rows in the middle section of the swath had the lower variation than the rows at the two swath-ends. The application uniformity increased as the application rate increased. The absolute error of application rate ranged from 1.3% to 6.5% with an average of 3.76%. There was no significant difference between the selected application rate and actual application rate (p > 0.8686).

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Impact of Variable Rate Fertilization on Subsurface Water Contamination in Wild Blueberry Cropping System

Cited by 12 publications

References 0 publications

Study on characteristics of soil and nutrient losses in Sunjiagou small watershed in cold black soil area

Study on characteristics of soil and nutrient losses in Sunjiagou small watershed in cold black soil area

Impacts of Climate Change and Different Crop Rotation Scenarios on Groundwater Nitrate Concentrations in a Sandy Aquifer

Performance Assessment of a Variable-Rate Fertilizer Applicator

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