Use of By-Plot CV's for Refining Mid-Season Fertilizer N Rates
Evaluation of the Yield Potential Based NFOA for Cotton D. Brian Arnall Oklahoma State University W. Raun, J. Solie, M. Stone, R. Taylor, J.C. Banks O. Walsh, D. Edmonds, C. Daft, B. England, Y. Kanke, B. Desta Sensor Based Nitrogen Rate Calculator What is needed. Yield Prediction Model Response Index Nitrogen Removal Nitrogen Use Efficiency. N Rate = (YP0 * RI YP0) * %N / Efficiency The Experimental Sites 2006 1 Site: Lake Carl Blackwell (LCB) 2-4.D
Late Season Stress 2007 3 sites: LCB YP, Altus 439, and Altus N study NDVI collected over and between rows 2008 4 sites: LCB Irrigated YP, LCB Dryland N study, Altus 439, and Altus N study Yield Potential Model Why use YP. Nitrogen is a model nutrient and according to Bray need is yield dependent. Using NDVI as a function of GDD. Days from Planting or Cumulative GDD Yield Potential Model 8.0 7.0
0 0.008 0.009 0.010 0.011 0.012 0.013 0.014 DFP INSEY (NDVI / days from planting to sensing) Relationship between in season estimate of yield (INSEY) computed from NDVI readings 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. Where YP0 = yield potential; YP0 calculated = the mean + one standard deviation. INSEY Cum GDD
LCB07-1015CummGDD 400 LCB07-1152CummGDD LCB07-1262CummGDD SWR-846CummGDD SWR-999CummGDD 0 0.000 0.000 0.001 0.001 0.001 CumINSEY (NDVI / Cumm GDD) Relationship between in season estimate of yield (Cum INSEY) computed from
NDVI readings of cotton at growth stages from square to peak bloom (800-1300 Cumm GDD), divided by the 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 NDVI Over Time 2 y = -0.0003x + 0.044x - 0.8865 2 r = 0.70 1.0 NDVI 0.8 0.6 0.4 0.2 0.0 30
40 50 60 70 80 Days from Planting to Sensing The trend of NDVI values as days from planting to sensing increases. 90 100 Response Index Dr. Johnson Response to added fertilizer nitrogen RINDVI NDVI of the N-Rich Strip / Farmer Practice
RIHarvest Yield of the N-Rich Strip / Farmer Practice RI Harvest and RI NDVI 2.0 y = 1.8579x - 0.932 2 r = 0.39 RI Harvest 1.5 LCB06-64DFP LCB06-66DFP LCB06-79DFP LCB07-70DFP LCB07-77DFP SWR-60DFP 1.0
0.5 0.0 0.5 0.8 1.0 1.3 1.5 RI NDVI Relationship between the response index measured in season, (NDVI of fertilized plot / NDVI of check plot) from readings of cotton at growth stages from 60 to 80 days after planting, and measured lint yield and the response index measured at harvest (yield of fertilized plot / yield of check plot) from all site years. Nitrogen Use and Uptake Research from different parts of the Cotton Belt suggests that high-yielding cotton
crops contain about 50-55 lbs. N/bale (Basset et al., 1970; Mullins & Burmester, 1990; Unruh and Silvertooth, 1996). Cotton Corp OSU Recommends 27 kg / bale (60 lbs N) Equivalent to .125 kg N / kg Lint, 12.5% N Components If all plant components are accounted for in the algorithm, this results in 146.39 g N kg-1 lint (70.267 lbs N bale-1). Higher than the values recorded as optimum N rates for cotton grown in Oklahoma of 83.0 g N kg-1 lint. The Girma et al. (2007a) data closely fit the value of 90 g N kg-1 lint which was calculated from removal of lint and seed. Not known if using the N content of only the lint and seed is adequate Or if it will be necessary burs, leaves or stems. Nitrogen Use and Uptake
Maximum N uptake occurred between 49 and 71 days after planting and was 2.9 and 4.3 kg ha -1 day-1 for cotton receiving 84 and 168 kg N ha -1, respectively. 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 1685-1693 Very little literature. NUE of 50%. SBNRC Algorithm N Rate = (YP0 * RI YP0) * %N / NUE potential cotton lint yield, kg/ha = 235.96 e 2216.2 * INSEY cotton lint yield, kg/ha = 177.41 e 2216.2 * INSEY Where: YP0 = 235.96 e 2216.2 * INSEY RI = 1.8579 * RINDVI 0.932 %N = 0.09 NUE = 0.50
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