Remote sensing based in-season N recommendations David Clay and Cheryl Reese.

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Presentation transcript:

Remote sensing based in-season N recommendations David Clay and Cheryl Reese

Dryland wheat systems Copyright 2010, Cheryl Reese SDSU Plant Science Dept. 2 N and P recommendations Mycorrhizae, carbon footprints, salinity

The northern Great Plains has some of the highest climate variability in the United States. Develop a sustainable system that increases soil and crop resilience. – Cover crops, were estimated by NRCS to be implemented in over 140,000 acres in South Dakota last year. – In-season N rates based on remote sensing may be a tool that can be used to help manage this variability.

Changes in our cultural practices and soil quality. Is soil carbon increasing the need for sensors.

What has happened to soil carbon

Carbon footprint (Corn)

Carbon footprints ProductgCO2 equivalent Hamburger (burger)3,600-6,100 Light bulb (4 hour day for 1 year)11,000 Nebraska (bu corn) (Liska et al.)7,640 North Dakota (bu corn)6,630 South Dakota5,840 Minnesota5,968 Gal of gasoline12,600

Carbon footprints (g CO2 eq/MJ) (Greet model) SD RegionFootprint w/o soilSoil (g CO2 eq/MJ)Adjusted footprint Gasoline95.86 NC C NE EC SE Relative to gasoline there is a 65 to 83% reduction in the footprint

Soil carbon Changes in our soil carbon values may be producing changes in our fertility requirements, Data from our soil testing laboratories can provide important information, A good way to account for OM differences is to include organic matter content in the N recommendation. Remote sensing-based recommendation may help account for differences as well.

Sensor use in wheat grown in a semi- arid environment

N rate impact on yield and wheat quality Research conducted in 2007 and N rates (0, 25%, 50%, 100%, and 150% of recommended rate, 2 water rates (adequate and deficit), N and water budgets developed, YLNS and YLWS determined using 13C isotopic discrimination, Protein and dough stability measured.

Farinograph

Poor quality bread

N rate influenced water use and N use efficiency (Dakota Lakes, Overly 2007) N rateYield bu WUE Bu/in NUE % fert Protein % Stability min ¼ ½

Yields Treatment2007 (Mg/ha)2008 (mg/ha) % % % % p0.001 LSD Water Not Stressed p

Protein vs fert + min N

We may see cultivar differences in dough quality

Reflectance calculations NDVI = (NIR-red) / (NIR+red) SI-NDVI wf = NDVI / NDVI wf SI-NDVI mz = NDVI / NDVI mz

Stress impacts on reflectance TreatBlueGreenRed nirNDVISI-NDVI Wf SI-NDVI MZ P lsd Water Not Stressed P

Summary Reference areas can be used to reduce variety and water stress impacts on sufficiency index values. Reference areas can be placed in a strip or within different management zones. Using a reference area in high yielding areas can result in diagnosing water stress as N stress. In low yielding areas N stress can be diagnosed as water stress.