Evaluation of the Yield Potential Based NFOA for Cotton
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Transcript of Evaluation of the Yield Potential Based NFOA for Cotton
Evaluation of the Yield Potential Evaluation of the Yield Potential Based NFOA for CottonBased NFOA for Cotton
D. Brian ArnallD. Brian Arnall
Oklahoma State UniversityOklahoma State University
W. Raun, J. Solie, M. Stone, R. Taylor, J.C. BanksW. Raun, J. Solie, M. Stone, R. Taylor, J.C. BanksO. Walsh, D. Edmonds, C. Daft, B. England,O. Walsh, D. Edmonds, C. Daft, B. England,
Y. Kanke, B. Desta Y. Kanke, B. Desta
Sensor Based Nitrogen Rate Sensor Based Nitrogen Rate CalculatorCalculator
What is needed.What is needed.Yield Prediction ModelYield Prediction Model
Response IndexResponse Index
Nitrogen RemovalNitrogen Removal
Nitrogen Use Efficiency.Nitrogen Use Efficiency.
N Rate = (YP0 * RI – YP0) * %N / N Rate = (YP0 * RI – YP0) * %N / EfficiencyEfficiency
The Experimental SitesThe Experimental Sites20062006– 1 Site: Lake Carl Blackwell (LCB)1 Site: Lake Carl Blackwell (LCB)
2-4.D2-4.DLate Season StressLate Season Stress
20072007– 3 sites: LCB YP, Altus 439, and Altus N study3 sites: LCB YP, Altus 439, and Altus N study
NDVI collected over and between rowsNDVI collected over and between rows
20082008– 4 sites: LCB Irrigated YP, LCB Dryland N 4 sites: LCB Irrigated YP, LCB Dryland N
study, Altus 439, and Altus N studystudy, Altus 439, and Altus N study
Yield Potential ModelYield Potential Model
Why use YP.Why use YP.– Nitrogen is a model nutrient and according to Nitrogen is a model nutrient and according to
Bray need is yield dependent.Bray need is yield dependent.
Using NDVI as a function of GDD. Using NDVI as a function of GDD. Days from Planting or Cumulative GDDDays from Planting or Cumulative GDD
43 Locations, 1998-2006
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.009 0.01
INSEY
Gra
in y
ield
, M
g/h
a
PKNP 1998PKSN 1998TPSN 1998PKNP 1999222 1999301 1999EFAA 1999801 1999502 1999PKNP 2000222 2000301 2000EFAA 2000801 2000502 2000HNAA 2000PKNP 2001222 2001301 2001EFAA 2001801 2001PKNP 2002222 2002301 2002EFAA 2002801 2002HNAA 2002502 2003222 2003EFAA 2003PKNP 2004222 2004301 2004502 200420052006
YP0 = 0.409e258.2 INSEY R2=0.50
YP0 + 1Std Dev = 0.590 e258.2 INSEY
Units: biomass, kg/ha/day, where GDD>0
Winter WheatWinter Wheat
Yield Potential ModelYield Potential Model
INSEY DFPINSEY DFP
Relationship between in season estimate of yield (INSEY) computed from NDVIRelationship between in season estimate of yield (INSEY) computed from NDVI
readings of cotton collected between 60-80 days after planting, divided by thereadings of cotton collected between 60-80 days after planting, divided by the
number of days of planting to sensing, and measured lint yield from all site years. number of days of planting to sensing, and measured lint yield from all site years.
Where YP0 = yield potential; YP0 calculated = the mean + one standard deviation. Where YP0 = yield potential; YP0 calculated = the mean + one standard deviation.
YP0 = 27.04e303.34x
y = 20.331e303.34x
r2 = 0.46
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400
800
1200
1600
0.008 0.009 0.010 0.011 0.012 0.013 0.014
DFP INSEY (NDVI / days from planting to sensing)
Lin
t Y
ield
(kg
ha
-1)
LCB06-64DFP
LCB06-66DFP
LCB06-79DFP
LCB07-70DFP
LCB07-77DFP
SWR-60DFP
INSEY Cum GDDINSEY Cum GDD
YPO = 235.96e2216.2x
y = 177.41e2216.2x
r2 = 0.69
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0.000 0.000 0.001 0.001 0.001
CumINSEY (NDVI / Cumm GDD)
Lin
t Y
ield
(k
g h
a-1
)
LCB06-886CummGDD
LCB06-949CummGDD
LCB06-1161CummGDD
LCB06-1215CummGDD
LCB07-1015CummGDD
LCB07-1152CummGDD
LCB07-1262CummGDD
SWR-846CummGDD
SWR-999CummGDD
Relationship between in season estimate of yield (Cum INSEY) computed fromRelationship between in season estimate of yield (Cum INSEY) computed fromNDVI readings of cotton at growth stages from square to peak bloom (800-1300NDVI readings of cotton at growth stages from square to peak bloom (800-1300Cumm GDD), divided by the number of days of planting to sensing, and measuredCumm GDD), divided by the number of days of planting to sensing, and measuredlint yield from all site years. Where YP0 = yield potential; YP0 calculated = thelint yield from all site years. Where YP0 = yield potential; YP0 calculated = themean + one standard deviation mean + one standard deviation
NDVI Over TimeNDVI Over Time
y = -0.0003x2 + 0.044x - 0.8865
r2 = 0.70
0.0
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0.4
0.6
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1.0
30 40 50 60 70 80 90 100
Days from Planting to Sensing
ND
VI
The trend of NDVI values as days from planting to sensing increases. The trend of NDVI values as days from planting to sensing increases.
Response IndexResponse Index
Dr. JohnsonDr. Johnson
Response to added fertilizer nitrogenResponse to added fertilizer nitrogen
RIRINDVINDVI
– NDVI of the N-Rich Strip / Farmer PracticeNDVI of the N-Rich Strip / Farmer Practice
RIRIHarvestHarvest
– Yield of the N-Rich Strip / Farmer PracticeYield of the N-Rich Strip / Farmer Practice
RI Harvest and RI NDVIRI Harvest and RI NDVI
Relationship between the response index measured in season, (NDVI of fertilizedRelationship between the response index measured in season, (NDVI of fertilizedplot / NDVI of check plot) from readings of cotton at growth stages from 60 to 80plot / NDVI of check plot) from readings of cotton at growth stages from 60 to 80days after planting, and measured lint yield and the response index measured atdays after planting, and measured lint yield and the response index measured atharvest (yield of fertilized plot / yield of check plot) from all site years. harvest (yield of fertilized plot / yield of check plot) from all site years.
y = 1.8579x - 0.932
r2 = 0.39
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0.5 0.8 1.0 1.3 1.5
RI NDVI
RI H
arve
st
LCB06-64DFP
LCB06-66DFP
LCB06-79DFP
LCB07-70DFP
LCB07-77DFP
SWR-60DFP
Nitrogen Use and UptakeNitrogen Use and Uptake
Research from different parts of the Cotton Research from different parts of the Cotton Belt suggests that high-yielding cotton Belt suggests that high-yielding cotton crops contain about 50-55 lbs. N/bale crops contain about 50-55 lbs. N/bale – (Basset et al., 1970; Mullins & Burmester, 1990; Unruh and Silvertooth, 1996). Cotton Corp(Basset et al., 1970; Mullins & Burmester, 1990; Unruh and Silvertooth, 1996). Cotton Corp
OSU Recommends 27 kg / bale (60 lbs N)OSU Recommends 27 kg / bale (60 lbs N)Equivalent to .125 kg N / kg Lint, 12.5%Equivalent to .125 kg N / kg Lint, 12.5%
N ComponentsN Components
If all plant components are accounted for in the If all plant components are accounted for in the algorithm, this results in 146.39 g N kg-1 lint algorithm, this results in 146.39 g N kg-1 lint (70.267 lbs N bale-1).(70.267 lbs N bale-1).Higher than the values recorded as optimum N Higher than the values recorded as optimum N rates for cotton grown in Oklahoma of 83.0 g N rates for cotton grown in Oklahoma of 83.0 g N kg-1 lint. The kg-1 lint. The Girma et al. (2007a) data closely fit the value of Girma et al. (2007a) data closely fit the value of 90 g N kg-1 lint which was calculated from 90 g N kg-1 lint which was calculated from removal of lint and seed. removal of lint and seed. Not known if using the N content of only the lint Not known if using the N content of only the lint and seed is adequate and seed is adequate Or if it will be necessary burs, leaves or stems. Or if it will be necessary burs, leaves or stems.
Nitrogen Use and UptakeNitrogen Use and Uptake
Maximum N uptake occurred between 49 and 71 Maximum N uptake occurred between 49 and 71 days after planting and was 2.9 and 4.3 kg hadays after planting and was 2.9 and 4.3 kg ha -1-1 dayday-1-1 for cotton receiving 84 and 168 kg N ha for cotton receiving 84 and 168 kg N ha -1-1, , respectively.respectively.– Boquet, D.J., and G.A. Breitenbeck. 2000. Nitrogen rate effect on partitioning of nitrogen Boquet, D.J., and G.A. Breitenbeck. 2000. Nitrogen rate effect on partitioning of nitrogen
and dry matter by cotton. Crop. Sci., Vol 40 pg 1685-1693and dry matter by cotton. Crop. Sci., Vol 40 pg 1685-1693
Very little literature.Very little literature.
NUE of 50%. NUE of 50%.
SBNRC AlgorithmSBNRC Algorithm
N Rate = (YP0 * RI – YP0) * %N / NUEN Rate = (YP0 * RI – YP0) * %N / NUE
potential cotton lint yield, kg/ha = 235.96 e potential cotton lint yield, kg/ha = 235.96 e 2216.2 * INSEY 2216.2 * INSEY cotton lint yield, kg/ha = 177.41 e 2216.2 * cotton lint yield, kg/ha = 177.41 e 2216.2 * INSEYINSEYWhere:Where:YP0 = 235.96 e 2216.2 * INSEYYP0 = 235.96 e 2216.2 * INSEYRI = 1.8579 * RINDVI – 0.932RI = 1.8579 * RINDVI – 0.932%N = 0.09%N = 0.09NUE = 0.50NUE = 0.50
2008 Sensing2008 SensingLCB Irrigated
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1 2 3 4 5 6 7 8 1 2 3 4
Treatment
YP
0 (
Ba
les
/ac
)
730 GDD
832 GDD
943 GDD
1148 GDD
1300 GDD
2008 Sensing2008 Sensing
LCB Dryland
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1 2 3 4 5 6 7 8 8 9
Treatment
YP
0 (B
ales
/ac) 700 GDD
832 GDD
943 GDD
1148 GDD
1300 GDD
The UnknownThe Unknown
Can Cotton “Catch-up” once it is behind?Can Cotton “Catch-up” once it is behind?
What should the level of preplant N be?What should the level of preplant N be?
What is the application window?What is the application window?
Plant Growth Regulators.Plant Growth Regulators.
Thank youThank you
Any Questions??????