Quality-of-water data, Palm Beach County, Florida, 1970-1975

Miller, Wesley L.; Lietz, A.C.

doi:10.3133/ofr76784

Cited by 2 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the mean Na/Cl weight ratio for farm canal water in the EAA ranged between 0.57 and 0.78, higher than that of the seawater and close to that of the marsh water (Gleason, 1974). However, the mean SO 4 /Cl weight ratio for farm canal water in the EAA ranged between 0.47 and 0.98 (Table 3), much higher than that of the seawater but close to that of shallow well water in western Palm Beach County and in the EAA, which were 0.79 (Parker et al, 1955) and 0.43 (Miller and Lietz, 1976), respectively.…”

Section: Resultsmentioning

confidence: 85%

“…The current specific conductance data points show that the elevated conductance observed at UF9208A is in the area of wells that have a Cl − concentration >500 mg L −1 and those of UF9206A and UF9206B are in the area of wells that have a Cl − concentration of 101−200 mg L −1 Chloride concentrations >100 mg L −1 were considered to be evidence of saltwater mixing with freshwater in the surficial aquifer system and indicate the presence of saltwater interface (Hittle, 1999). Up to 400 mg L −1 of Cl − and 390 mg L −1 of Na + were reported in shallow ground waters close to UF9206A and UF9206B in two separate investigations conducted by Miller and Lietz (1976) (Fig. 5) and Scott (1977) Specific conductance in three farms in the vicinity of UF9206A and UF9206B averaged 1.56, 2.15, and 2.29 dS m −1 , respectively, and the shallow ground water had a mean specific conductance of 1.54 dS m −1 (CH2M Hill, 1978).…”

Section: Resultsmentioning

confidence: 98%

“…Water chemical characteristics of shallow wells (5.3–6.0 m depth) in the Everglades Agricultural Area and current study farm locations (well data from Miller and Lietz, 1976). …”

Section: Resultsmentioning

confidence: 99%

“…High specific conductance values and ion concentrations were found in shallow wells (5.3–6.0 m) in an area just south of Lake Okeechobee, between West Palm Beach Canal and Hillsboro Canal (Miller and Lietz, 1976) (Fig. 5).…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Specific Conductance and Ionic Characteristics of Farm Canals in the Everglades Agricultural Area

et al. 2006

View full text Add to dashboard Cite

Specific conductance in farm canals of the Everglades Agricultural Area (EAA) in south Florida is an important water quality parameter that was categorized as a parameter of concern according to an observed frequency of >5% excursions over the Class III water quality criterion and needed to be addressed as a part of the Everglades Regulatory Program. This study was conducted to evaluate specific conductance in farm canals of the EAA. Specific conductance was monitored at 10 representative farms (a total of 12 pump stations) in the EAA using multi-parameter water quality data loggers, for periods ranging from 24 to 83 mo. Cation and anion concentrations were also determined. Nonparametric Mann-Kendall trend analyses and Sen's slope analysis of specific conductance were conducted to determine specific conductance trends. Mean specific conductance ranged from 0.74 to 1.68 dS m(-1) and only 2 of the 10 farms were above the State Class III water quality criterion of 1.275 dS m(-1). Statistically significant downward trends were observed at 3 of the 10 farms. Determination of ion compositions in grab samples at 8 of the 10 farms indicated that the major ions contributing to the increase in specific conductance in the EAA were Cl-, HCO3-, and Na+. Mean Na/Cl ratios in most of the EAA canals ranged from 0.57 to 0.78, whereas those of SO4/Cl ranged from 0.46 to 0.98. Investigation of historical data and literature indicates that elevated specific conductance in parts of the EAA is a natural phenomenon due to entrapment of connate seawater in the Everglades formation. Sulfur contributes minor increases in specific conductance in the EAA with probable sources from organic soil mineralization, ground water, Lake Okeechobee, and S fertilizers.

show abstract

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 98%

“…Water chemical characteristics of shallow wells (5.3–6.0 m depth) in the Everglades Agricultural Area and current study farm locations (well data from Miller and Lietz, 1976). …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Specific Conductance and Ionic Characteristics of Farm Canals in the Everglades Agricultural Area

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Despite TSCs historical occurrence in only certain tropical areas of Latin America, P. maydis (alone, i.e., not in association with M. maydis ) was detected for the first time in several locations in the Midwestern United States in 2015 (Bissonnette, 2015; Ruhl et al, 2016; Wise et al, 2016). In addition to reconfirmation at the same locations in 2016, the pathogen was also reported in Florida (Bradley, 2016; Hansen et al, 2016; Miller, 2016) and Minnesota in 2017 and 2018 (Dr. Martin Chilvers, personal communication). There have been no reports of yield losses caused by P. maydis alone so far; however, Mottaleb et al (2018) have hypothesized that if TSC did form in the USA by the association of M. maydis with P. maydis , a loss of only 1% of the country-wide grain production would equate to 1.5 million metric tons worth US $231.6 million.…”

Section: Introductionmentioning

confidence: 76%

Application of Remote Sensing for Phenotyping Tar Spot Complex Resistance in Maize

et al. 2019

View full text Add to dashboard Cite

Tar spot complex (TSC), caused by at least two fungal pathogens, Phyllachora maydis and Monographella maydis , is one of the major foliar diseases of maize in Central and South America. P. maydis was also detected in the United States of America in 2015 and since then the pathogen has spread in the maize growing regions of the country. Although remote sensing (RS) techniques are increasingly being used for plant phenotyping, they have not been applied to phenotyping TSC resistance in maize. In this study, several multispectral vegetation indices (VIs) and thermal imaging of maize plots under disease pressure and disease-free conditions were tested using an unmanned aerial vehicle (UAV) over two crop seasons. A strong relationship between grain yield, a vegetative index (MCARI2), and canopy temperature was observed under disease pressure. A strong relationship was also observed between the area under the disease progress curve of TSC and three vegetative indices (RDVI, MCARI1, and MCARI2). In addition, we demonstrated that TSC could cause up to 58% yield loss in the most susceptible maize hybrids. Our results suggest that the RS techniques tested in this study could be used for high throughput phenotyping of TSC resistance and potentially for other foliar diseases of maize. This may help reduce the cost and time required for the development of improved maize germplasm. Challenges and opportunities in the use of RS technologies for disease resistance phenotyping are discussed.

show abstract

Quality-of-water data, Palm Beach County, Florida, 1970-1975

Cited by 2 publications

References 0 publications

Specific Conductance and Ionic Characteristics of Farm Canals in the Everglades Agricultural Area

Specific Conductance and Ionic Characteristics of Farm Canals in the Everglades Agricultural Area

Application of Remote Sensing for Phenotyping Tar Spot Complex Resistance in Maize

Contact Info

Product

Resources

About