Soil Testing Lab Update and Late Season Nitrogen in Corn

Transcription

1 Soil Testing Lb Updte nd Lte Seson Nitrogen in Corn Andrew Stmmer nd Dorivr Ruiz Diz Soil Fertility Reserch nd Extension

2 Services Soil Testing Plnt Anlysis Lime Testing Wter Testing Soil Fertility Reserch nd Extension

3 Services Dignostic Testing for gents Shipping Lbels Online Pyments Soil Fertility Reserch nd Extension

4 Common Soil Testing Mistkes Collect too few soil cores Collect cores for the wrong depth ph, P, K deeper thn 6 N,S, Cl only 6 Testing for unnecessry elements Soil Fertility Reserch nd Extension

5 Soil Tests for Knss Crops Crop ph P K OM Zn NO3 S Cl Surfce Subsoil Alflf x x x x Corn x x x x x x x x Grss x x x x Ots x x x x x Sorghum x x x x x x x x Soyben x x x x x Sunflower x x x x x x x Whet x x x x x x x Soil Fertility Reserch nd Extension

6 Nitrogen fertiliztion guidelines nd lte N fertilizer pplictions in corn Soil Fertility Reserch nd Extension

7 Bckground Lte N ppliction Previous studies showed significnt mount of N uptke post flowering. From: Json DeBruin, DuPont Pioneer.

8 Lte N ppliction nd fertilizer N recommendtions The effect of lte N pplictions on grin yield. Cn we increse nitrogen use efficiency with lte N pplictions? How this my ffect fertilizer recommendtions? N = (yield gol x 1.6) Soil NO 3 (% SOM x 20) + Previous crop djustments Soil Fertility Reserch nd Extension

9 Procedures Four loctions in 2016 (ongoing in 2017). Appliction rte bsed on KSU fertilizer recommendtion. With rtes of +/ 50 lbs N/cre Two ppliction times: 1. All N fertilizer t plnting 2. Split lte ppliction with 40% of the totl rte t VT R1. Soil Fertility Reserch nd Extension

10 Mesurements R1 Er leves for N content Plnt nd grin biomss nd N content Yield Grin N content End of seson soil profile N Soil Fertility Reserch nd Extension

11 Soil properties 2016 loctions 0 60 cm 0 15 cm Site County Soil Type Soil Texture Previous Crop Irrigtion NH 4 N N0 3 N ph OM 1 Republic Crete Silt Lom Soybens Irrigted Brown Kennebec Silt Lom Soybens Dry Lnd Shwnee Eudor Silt Lom Soybens Irrigted Lyon Chse Silty Cly Lom Soybens Drylnd Soil Fertility Reserch nd Extension

12 Nitrogen ppliction rtes Site KSU Rec N rtes (lbs/cre) 1 Republic Brown Shwnee Lyon All N fertilizer t plnting (100%) 2. Split pplied t VT-R1 (60% plnting 40% VT) Soil Fertility Reserch nd Extension

13 Fertilizer N ppliction 76 in clernce Soil Fertility Reserch nd Extension

14 Yield response by loction Loction Site 1 1 Loction Site b 150 Yield bu/ 100 Yield bu/ N control At plnting Split-N 50 0 N control At plnting Split-N Totl N Fertilizer (lbs/cre) Totl N Fertilizer (lbs/cre) Soil Fertility Reserch nd Extension

15 Yield response by loction Loction Site 3 3 Loction Site Yield bu/ b Yield bu/ b 50 0 N control At plnting Split-N N control At plnting Split-N Totl N Fertilizer (lbs/cre) Totl N Fertilizer (lbs/cre) Soil Fertility Reserch nd Extension

16 Yield cross loctions Yield bu/ b N control At plnting Split-N check N rte, Diff from recommended rte (lbs/cre) Soil Fertility Reserch nd Extension

17 Er lef N concentrtion 3.0 Er lef N (%) * * * * * N control At plnting Split-N check N rte, Diff from recommended rte (lbs/cre) Soil Fertility Reserch nd Extension

18 Grin N concentrtion * Grin N (%) * 0 N control At plnting Split-N check N rte, Diff from recommended rte (lbs/cre) Soil Fertility Reserch nd Extension

19 N use efficiency definitions Production efficiency bsed on hrvested crop product (grin) Prtil fctor productivity (PFP): bu/ lb/ N fertilizer Agronomic efficiency (AE): bu/ lb/ N fertilizer Recovery efficiency Bsed on nutrient recovery by the crop (uptke) Prtil Nutrient Blnce (PNB): lbs/ N in grin N fertilizer Apprent Recovery Efficiency (RE): Δ lb/ Nuptke lb/ N fertilizer Crrie Lboski, Ph.D. CPSS, Assoc. Professor, 13 Soil Fertility Reserch nd Extension

20 Apprent Recovery Efficiency (lb increse in totl N uptke per lb of N pplied) RE = (N t N c ) /N r RE = Apprent Recovery Efficiency N t = Nitrogen uptke N c = Nitrogen uptke from 0 N control N r = Nitrogen fertilizer rte Soil Fertility Reserch nd Extension

21 Apprent Recovery Efficiency cross loctions * * All pre-plnt Split N NUE (RE) N rte, diference from recomended rte (lbs/cre) Soil Fertility Reserch nd Extension

22 End of seson residul soil profile N Residul profile, 0-24 in NO3-N (ppm) * * check Totl N Fertilizer (lbs/cre) 0 N control At plnting Split -N Soil Fertility Reserch nd Extension

23 Summry Preliminry results showed soil pplied N postflowering cn provide N for corn uptke. N movement to the root zone for uptke cn be limittion under drylnd? Potentilly more benefit s rescue N ppliction, prticulrly from fll pplied N. Soil Fertility Reserch nd Extension

24 Summry Current N fertilizer recommendtions my be high t high yielding sites. No yield penlty with lte N pplictions Possible yield dvntge during yers with erly seson N loses? Fertilizer recovery efficiency ws higher with split lte N pplictions Long term effect on NUE??? Soil Fertility Reserch nd Extension

25 Lte N Fungicide nd Folir N Soil Fertility Reserch nd Extension

26 Experimentl Design Soil pplied N 0, 160 nd 200 lbs. N/cre Some tretments nd Fungicide pplied to ll N tretments Folir N pplied to some split tretments Soil Fertility Reserch nd Extension

27 Preplnt N Rtes nd Yield 140 Neosho 240 Rossville 240 Scndi Yield (bu/cre) b Yield (bu/cre) b Yield (bu/cre) b N rte (lbs/cre) N rte (lbs/cre) N rte (lbs/cre) Corn grin yield response to N fertilizer ppliction rtes t plnting t 3 loctions in Different letters indicte sttisticlly significnt differences t the p<0.1. Soil Fertility Reserch nd Extension

28 Fungicide Split N nd Yield Corn grin yield response to folir N fertilizer nd fungicide ppliction with the 200 lbs. N/ rte cross 3 loctions in Different letters indicte sttisticlly significnt differences t the p<0.1. Soil Fertility Reserch nd Extension

29 Summry Corn yield responded to N fertilizer t ll loctions There ws no yield difference between 160 nd 200 lbs. N/cre rtes Fungicide incresed yields t the 200 lbs. N/cre rte Grin N concentrtion incresed significntly with 4.5 lbs./cre dditionl folir N Soil Fertility Reserch nd Extension

30 Soil Fertility Reserch nd Extension