1991-1993 1994 1995 1996 1997-1999 2000 2001

In 1997, our precision sensing team put together two web sites to communicate TEAM-VRT results. Since that time, over 18,000 visitors have been to the sites of OSU (www.dasnr.okstate.edu/precision_ag).

The first attempt to combine sensor readings over sites into a single equation for yield prediction was initiated in the fall of 1997, and tested in 1998. A modification of this index would later become known as INSEY (in-season estimated yield), but was first called F45D.

Cooperative research program initiated with CIMMYT. Kyle Freeman recently spent 4 months in Ciudad Obregon, 1111X, working with CIMMYT on the applications of sensors for plant breeding and nutrient management.

Applications of indirect measures of electrical conductivity were evaluated in several field experiments. This work aims to identify added input variables to refine the in-season prediction of yield.

TEAM-VRT entered into discussions with John Mayfield concerning the potential commercialization of a sensor-based N fertilizer applicator for cereal crops.

The results that we were looking for (increased yields at I over N rates) came through at Covington. However, at 10 OFF field experiments in 2000, this same result could not be repeated. Using the in-season response index (RINDV ), we were able to proj ect responsiveness to applied N, which changes from location to location based on climatic conditions specific to each parcel of land, and that changes on the same land from year to year.