search for: nitrate

I am trying to calculate monthly means by year of phosphates and nitrates from a multi year data set. Can anybody help me out with the most effective way to do this? My data looks like this: Collection_Date                   Test.Name              Value 2000-01-24 17:00:00            Phosphate               0.108 2000-01-24 17:00:00            Nitrate                 ...

I measured nitrate concentration and primary production (PP) biweekly for 23 months in one headwater stream. I would like to use linear regression to determine if PP is related to nitrate concentration. My dataframe is called "data" and consists of the vectors Rdate, PP, and nitrate. Rdate is the ob...

Hello, my name is Toby, and i live in Sydney Australia. i would like to buy a 25Kg bag of strontium nitrate and have it delivered to an address in sydney. i understand that long distance postage can sometimes be very costly, so can you please give a a quote for the 25Kg bag, plus the postage cost to my address in sydney. thankyou for your time ___________________________________________________________...

Hello, I'm trying to make a lattice plot (using xyplot()). I have included a "layout=c(3,4)" statement, giving me 12 plots per page and an "as.table=TRUE" statement, directing the way the plots are laid out. I have 18 plots altogether and so 6 of them end up on the second page. Everything looks fine for the first page, but the x-axis labels (e.g. 1993, 1994...) are all

Dear list users, I have trouble with covariance analysis. I measured nitrate concentrations in the soil (NO3) and the percentage of legumes (LEG, continuous), affected by 2 different CO2 concentrations (CO2, discrete). I suspect that CO2 has an effect on LEG and NO3, but also that LEG has an effect on NO3, so this is the formula I wrote to test this: NO3 ~ CO2 + LEG + CO...

...dec.lat.va dec.long.va drainSqKm areaUnits drainSqKmFlow areaUnits staAbbrev param.nm paramShortName constitAbbrev param.units 2169570 2169570 Gills Creek at Columbia, SC 33.98960016 -80.97425727 152.7543752904 2 152.7543752904 2 GillsColumSC Total nitrogen, water, unfiltered, milligrams per liter Nitrate as N TN mg/L <span id=m2wTl><p><font face="Arial, Helvetica, sans-serif" size="2" style="font-size:13.5px">_______________________________________________________________<BR>Get the Free email that has everyone talking at <a href=http://ww...

...replicates (at the same time) from each of the sites. I used each of the replicates in a treatment. There were 4 treatments. 2 were controls and the other two were a simulated 30 day drought and a simulated 60 day drought. >From each of the replicates in each of the treatments I measured pH and nitrate, sulphate, dissolved organic carbon, calcium, magnesium, nickel, cobalt, aluminum, and copper concentrations. I tried performing an NMDS using the following tutorial http://strata.uga.edu/software/pdf/mdsTutorial.pdf. However, I did not take into account sites or treatments. All the data was used...

...esses of each command, why they produce different p-values, and which one is the most appropriate for my particular needs. First, let me describe the dataset I am working with. The project I am working on collected water samples from groups/networks of about 30 water wells and analyzed them for nitrate, major ions, and other chemical constituents. We revisited those same wells about 10 years later and analyzed the water samples for the same chemical constituents. I now have a paired dataset, and the question I would like to answer is whether there was a "significant" change in conce...

...0093, 0.00081, 0.0011, 0.00058, 0.001, 0.0011, 8e-04, 0.00094, 0.00047, 0.0011, 0.0011), Dissolved.Ammonia...N..phenate. = c(NA, 0.14, 0.13, 0.22, NA, NA, NA, 0.085, NA, 0.098, NA, 0.055, NA, NA, NA, 0.14, 0.057, 0.087, 0.078, 0.081, 0.086, NA, 0.07, NA, 0.11, NA, NA), Dissolved.Nitrate.Nitrite...N = c(0.13, 0.15, 0.11, 0.14, 0.13, 0.15, 0.16, 0.12, 0.054, 0.055, 0.051, 0.086, 0.098, 0.13, 0.13, 0.1, 0.16, 0.13, 0.15, 0.13, 0.14, 0.1, 0.035, 0.22, 0.058, 0.054, 0.17), Dissolved.Nitrite...N = c(NA, NA, NA, NA, NA, NA, NA, 0.0076, 0.0057, NA, NA, NA, NA, NA, NA,...

Dear list, I've been learning how to make a 2x2 paneled dotplot in lattice without any previous experience using lattice. my code thusfar is: nut<-read.table("/Users/colinwahl/Desktop/nutsimp_noerror.csv", T, sep= ",") attach(nut) nut1<-data.frame(Nitrate, Total_Nitrogen, Phosphate, Total_Phosphorus) nut1<-as.matrix(nut1) rownames(nut1)<-group ylimlist=list(c(0,10), c(0,10), c(0,0.25), c(0,0.25)) dotplot(nut1, groups=FALSE, horizontal=FALSE, scales = list(relation='free' ), ylim=ylimlist, ylab="Nutrient Concentration (mg/L)&qu...

...the connection 5 file(file, "rt") 4 read.table(file = file, header = header, sep = sep, quote = quote, dec = dec, fill = fill, comment.char = comment.char, ...) 3 FUN("specdata/3e+01.csv"[[1L]], ...) 2 lapply(filepaths, read.csv) 1 pollutantmean("specdata", "nitrate", 30) In addition: Warning message: In file(file, "rt") : cannot open file 'specdata/3e+01.csv': No such file or directory *The problem is that when a single number (30, 104, 223) is input, it's being stored as 3e+01 and no longer corresponds with the .csv file I'm...

...for ingestion, unit: mmol N/m^3 eps = .3, #Growth efficiency of zooplankton delz = 5, D = 2.6, #diffusion coefficiency, unit: m^2/d g = 0.025, #zooplankton mortality rate, unit: d^-1 (mmol N)^-1 N0 = 14, #Nitrate concentration at 150 m NB = length(DEPTH)) #Number of depth intervals P.int = c(rep(0.07, 8),.12, .18,rep(0.21,3),rep(0.35,2), rep(0.42,2),rep(0.07, 8), rep(0.01, 5)) Z.int = P.int/7 N.int = c(rep(0.1, 13), rep(4.55, 5), rep(10,12)) state = c(P.int, Z.int, N.int) Time = seq(0,100...

Dear Rich, It depends how the data is generated. Although I am not an expert in ecology, I can explain it based on a biomedical example. Certain variables are generated geometrically (exponentially), e.g. MIC or Titer. MIC = Minimum Inhibitory Concentration for bacterial resistance Titer = dilution which still has an effect, e.g. serially diluting blood samples; Obviously, diluting the

Hi, I'm trying to compile ocfs2 1.2.6 on a 2.6.21 kernel (with rsbac and pax patches), but I can't get this to work .. In 2.6.20 there was an change in the definition of the INIT_WORK macro (http://lkml.org/lkml/2006/12/5/269) this seems to cause my problems (see below) but even after removing the third parameter of the INIT_WORK calls the compile fails (see second compile failure). Can