Environmental and management factors that influence drainage water P loads from Everglades Agricultural Area farms of South Florida

Lang, Tim; Oladeji, Olawale O.; Josan, Manohardeep S.; Daroub, Samira H.

doi:10.1016/j.agee.2010.04.015

Cited by 20 publications

(17 citation statements)

References 32 publications

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“…However, owing to the fertilization season during the rice-planting period, the N concentration in the soil is remarkably high, and the peak value of the N concentration is consistent with the peak value of the heavy rain during this period. Lang found a significant and positive correlation between the soil depth and the flow-weighted total N and P concentrations [43]. Moreover, the results of their study revealed that the irrigation water N and P concentrations have an impact on the drainage N and P loads.…”

Section: Discussionmentioning

confidence: 92%

“…Nevertheless, we believe that our SOM approach can perform better in future studies if additional environmental and management factors are considered. In addition to the rainfall, there are many other factors, such as soil conditions (soil moisture, soil depth, soil macropore, available N and Olsen P concentrations) and management practices (irrigation N and P concentrations, dry period, land cover, and fertilization), that influence the drainage water N and P concentrations or loadings [4, 43,53]. The SOM approach developed in this study helps to predict the total N and P in the drainage based on high-resolution monitoring at 6 h intervals.…”

Section: Discussionmentioning

confidence: 99%

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Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

He¹,

et al. 2019

Preprint

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Background Rice paddy wetlands may serve as a nutrient source or sink in agricultural ecosystems. However, the pattern of nutrient loss on a large scale is not clear. A year-round on-site observation study based on 6 h intervals was conducted. Rainfall, temperature, runoff nutrient concentrations, and adjacent stream water samples were automatically monitored to uncover the temporal changes in the runoff losses of the main nutrient proxies (total N and total P) from a typical rice-planting area (120 ha) in the Yangtze river delta region of China.Results A high total N concentration in the rice-planting area was observed during the rice-planting season; however, a larger fluctuation in the total P was evident throughout the year. The Δtotal N (drainage minus stream) parameter showed negative values with a mean of −0.25 mg L −1 , while Δtotal P showed positive values with a mean of 0.06 mg L −1 . The window phases for the total N loss are mainly concentrated in the rice-growing season. However, the window phase for the total P loss was more dispersive throughout the year. No clear relationships were found between rainfall and N and P concentrations by self-organizing map analysis.Conclusions This high-resolution monitoring suggested that nutrient loss loading, rather than nutrient concentration, was strongly related to runoff depth, and the avoidance of fertilization before high-intensity rainfall could mitigate the nutrient runoff losses and maintain the rice wetland eco-function.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

He¹,

et al. 2019

Preprint

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show abstract

“…Some studies [45] show that the total P in the paddy soil is mainly organic P and inorganic Al oxide-P and Fe oxide-P, which is wrapped in aggregates, and it is not easily released into the runoff. Some studies [46,47] showed that P migrates mainly through small-sized organic-inorganic composite colloids. Therefore, its mobility is relatively less affected by runoff, and its concentration increases when soluble P and colloidal P enter the water body with an increasing runoff amount.…”

Section: Discussionmentioning

confidence: 99%

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

et al. 2020

Environ Sci Eur

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Background: Rice paddy wetlands may serve as a nutrient source or sink in agricultural ecosystems. However, the pattern of nutrient loss on a watershed scale is not clear. A year-round on-site observation study based on 6-h intervals was conducted. Rainfall, temperature, runoff nutrient concentrations, and adjacent stream water samples were automatically monitored to uncover the temporal changes in the runoff losses of the predominant nutrient proxies (total N and total P) from a typical rice-planting area (120 ha) in the Yangtze river delta region of China. Results: A high total N concentration in the rice-planting area was observed during the rice-planting season; however, significant fluctuation in the total P was evident throughout the year. The Δtotal N (drainage minus stream) parameter showed negative values with a mean of −0.25 mg L −1 , while Δtotal P showed positive values with a mean of 0.06 mg L −1. The annual average N and P runoff from paddy field were 11.6 kg ha −1 and 1.5 kg ha −1 , respectively. The window phases for the total N loss were mainly concentrated in the rice-growing season. However, the window phase for the total P loss was more dispersive throughout the year. No apparent relationships were found between rainfall and N and P concentrations by self-organizing map analysis. Conclusions: The high-resolution monitoring, in this study, suggested that nutrient loss loading rather than nutrient concentration was strongly related to surface runoff Therefore, fertilization before high-intensity rainfall should be avoided to mitigate the nutrient runoff losses and maintain the rice wetland eco-function.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Therefore, its mobility is relatively less affected by runoff, and its concentration increases when soluble P and colloidal P enter the water body with an increasing runoff amount. During heavy rainfall, all the soluble P and colloidal P in the soils carried by the runoff, and the concentration is diluted, resulting in a lower concentration [47]. However, owing to the fertilization that occurs during the riceplanting period, the N concentration in the soil tends to be remarkably high, with a peak value consistent with the peak value of the heavy rainfall.…”

Section: Discussionmentioning

confidence: 99%

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

He¹,

et al. 2020

Preprint

View full text Add to dashboard Cite

Background: Rice paddy wetlands may serve as a nutrient source or sink in agricultural ecosystems. However, the pattern of nutrient loss on a watershed scale is not clear. A year-round on-site observation study based on 6-h intervals was conducted. Rainfall, temperature, runoff nutrient concentrations, and adjacent stream water samples were automatically monitored to uncover the temporal changes in the runoff losses of the predominant nutrient proxies (total N and total P) from a typical rice-planting area (120 ha) in the Yangtze delta region of China. Results: A high total N concentration in the rice-planting area was observed during the rice-planting season; however, significant fluctuation in the total P was evident throughout the year. The Δtotal N (drainage minus stream) parameter showed negative values with a mean of −0.25 mg L -1 , while Δtotal P showed positive values with a mean of 0.06 mg L −1 . The annual average N and P runoff from paddy field were 11.6 kg ha −1 and 1.5 kg ha −1 , respectively. The window phases for the total N loss were mainly concentrated in the rice-growing season. However, the window phase for the total P loss was more dispersive throughout the year. No apparent relationships were found between rainfall and N and P concentrations by self-organizing map analysis. Conclusions: The high-resolution monitoring, in this study, suggested that nutrient loss loading rather than nutrient concentration, was strongly related to surface runoff Therefore, fertilization before high-intensity rainfall should be avoided to mitigate the nutrient runoff losses and maintain the rice wetland eco-function.

show abstract

Environmental and management factors that influence drainage water P loads from Everglades Agricultural Area farms of South Florida

Cited by 20 publications

References 32 publications

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

Window phase analysis of nutrient losses from a typical rice-planting area in the Yangtze river delta region of China

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