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Department of Agronomy

Kansas State University

1712 Claflin Rd.

2004 Throckmorton PSC

Manhatan, KS 66506

785-532-6101

agronomy@ksu.edu

Extension Agronomy

Comparative Vegetation Condition Report: August 27 - September 9

K-State’s Ecology and Agriculture Spatial Analysis Laboratory (EASAL) produces weekly Vegetation Condition Report maps. These maps can be a valuable tool for making crop selection and marketing decisions.

Two short videos of Dr. Kevin Price explaining the development of these maps can be viewed on YouTube at:
http://www.youtube.com/watch?v=CRP3Y5NIggw
http://www.youtube.com/watch?v=tUdOK94efxc

The objective of these reports is to provide users with a means of assessing the relative condition of crops and grassland. The maps can be used to assess current plant growth rates, as well as comparisons to the previous year and relative to the 24-year average. The report is used by individual farmers and ranchers, the commodities market, and political leaders for assessing factors such as production potential and drought impact across their state.

NOTE TO READERS: The maps below represent a subset of the maps available from the EASAL group. If you’d like digital copies of the entire map series please contact Kevin Price at kpprice@ksu.edu and we can place you on our email list to receive the entire dataset each week as they are produced. The maps are normally first available on Wednesday of each week, unless there is a delay in the posting of the data by EROS Data Center where we obtain the raw data used to make the maps. These maps are provided for free as a service of the Department of Agronomy and K-State Research and Extension.

The maps in this issue of the newsletter show the current state of photosynthetic activity in Kansas, the Corn Belt, and the continental U.S., with comments from Mary Knapp, service climatologist:

 

 

KAN_36_2013_CNDVI

Figure 1. The Vegetation Condition Report for Kansas for August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that the area of low photosynthetic activity is increasing in northwest Kansas. This is the region of the state that has had the most area of exceptional drought, and the low rainfall and high temperatures continued to dominate the region during this two-week composite period.

 

KAN_36_2013_PYNDVI

Figure 2. Compared to the previous year at this time for Kansas, the current Vegetation Condition Report for August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that while much of the state has greater photosynthetic activity, Rooks County has had a big decrease in biomass productivity. It is important to note that the increase in photosynthetic activity over much of the state is mainly a reflection of how poor production was in 2012.

KAN_36_2013_LTNDVI

Figure 3. Compared to the 24-year average at this time for Kansas, this year’s Vegetation Condition Report for August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that the Northwestern Division has the lowest NDVI values, with Decatur, Norton and Phillips counties having the lowest biomass productivity. In Decatur County, the precipitation for Jan-Aug averaged just 57 percent of normal.

CRN_36_2013_CNDVI

Figure 4. The Vegetation Condition Report for the Corn Belt for August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that areas of greatest biomass productivity are in northeastern Nebraska and northwestern Iowa, as well as in northern Wisconsin into the Upper Peninsula of Michigan. This includes areas of late-planted row crops struggling to complete development. In northwestern Iowa, only 53 percent of the corn has reached dent, compared to 99 percent last year.

CRN_36_2013_PYNDVI

Figure 5. The comparison to last year in the Corn Belt for the period August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that photosynthetic activity in Nebraska, South Dakota, and much of Iowa are much higher than last year. This is mainly a reflection of the late development of this year’s crop. In Iowa, 35 percent of the corn is rated good to excellent, while in Nebraska 62 percent of the corn is rated good to excellent.

CRN_36_2013_LTNDVI

 

Figure 6. Compared to the 24-year average at this time for the Corn Belt, this year’s Vegetation Condition Report for August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that much of the region has near-average biomass productivity. North Dakota has a large area of much-above-average photosynthetic activity. In North Dakota, 58 percent of the pastures are reported in good to excellent condition. 

 

 US_36_2013_CNDVI

Figure 7. The Vegetation Condition Report for the U.S. for August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that photosynthetic activity continues to be high in the eastern half of the U.S., as well as along the Pacific Northwest. NDVI values are particularly high along the Appalachians into northern New England.

 

US_36_2013_PYNDVI

Figure 8. The U.S. comparison to last year at this time for the period August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that the biggest decrease in biomass productivity is in the Southeast, from east Texas to the Carolinas, while the Central Plains has the biggest increase in activity. Wetter conditions this year have resulted in some disease problems and harvest delays. 

US_36_2013_LTNDVI

Figure 9. The U.S. comparison to the 24-year average for the period August 27 – September 9 from K-State’s Ecology and Agriculture Spatial Analysis Laboratory shows that biggest area of below-average biomass production continues to be in the W. Extreme drought continues in east Texas, and in Nevada and Utah.

Mary Knapp, Agronomy, Weather Data Library
mknapp@ksu.edu          

Kevin Price, Agronomy and Geography, Remote Sensing, Natural Resources, GIS
kpprice@ksu.edu

Nan An, Graduate Research Assistant, Ecology & Agriculture Spatial Analysis Laboratory (EASAL)
nanan@ksu.edu