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What is response index (RI) and how is it estimated?

April 26, 2017estimated index Response RI

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What is response index (RI) and how is it estimated?

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RI is an in-season quantitative measure of the response to additional N for each field environment. Using the RT200 or a Handheld sensor, NDVI readings are collected from the nitrogen rich strip and the field rate to determine the benefit of additional N. To determine the response index we simply divide the NDVI from the N rich strip by the NDVI value of the field rate. This ratio provides an indication of how the crop will respond to additional N.