Use of aerial imagery to detect N response in corn following alfalfa FR 5262 Matt Yost Stephen Palka.

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Presentation transcript:

Use of aerial imagery to detect N response in corn following alfalfa FR 5262 Matt Yost Stephen Palka

Alfalfa provides N to following crops ~100 lb N ac -1 yr -1 2% N ~200 lb N ac -1 yr -1

Alfalfa provides Nitrogen to corn for 2 years State 1 st -year N credit † 2 nd -year N credit † lb N ac IA IL10030 IN KS MI MN15075 MO ND15075 NE OH SD15075 WI15050

42 on-farm alfalfa-corn N rate trials ( ) K Regrowth, tillage time No-till Manure Predictors Stover removal, predictors 1 st -year corn 31 site-years 2 nd -year corn 11 site-years

More trials needed: Can yield differences be detected with NDVI?

1 st year corn - ROHE Fall applied manure 4 fertilizer N rates Corn 2011

2 nd year corn – MARPE

Aerial imagery: - 1m spatial resolution - 4 bands (RGB, NIR) - collected Aug Create shapefiles of plots in ArcMap: GPS points (10-70 cm accuracy) Projected to NAD 83 UTM Zone 15N Change image band order: Originally IR R G B, changed to B G R IR in ArcMap Calculate vegetation Indices: Create AOI for plots Use signature editor to average pixel values for plots. Methods

ROHE MARPE Aerial images

Shapefiles of plots with -1.5 ft buffer

NDVI - MARPE

NDVI - ROHE

Methods of NDVI calculation

NDVI related to corn grain yield

Other indices were not better – IR/RED

Other indices were not better - TNDVI

Highest correlation – Silage yield vs. IR/Red

Can NDVI be used to detect corn yield differences? Main effectP values (P > F) Grain yieldSilage yieldNDVI Manure N Manure*N Regrowth N Regrowth*N YES!

Are the slopes of yield and NDVI related? - ROHE

Are the slopes of yield and NDVI related? - MARPE

Conclusions Farmers could use aerial imagery to determine whether N fertilizer treatments affected corn yield. This would make it easy for farmers to conduct their own research. More fields and correlations are needed to validate this conclusion. Future work: More fields, larger plots, Tassel cap transformations, online tools