The objective of this paper is to evaluate Cotton, Gossypium hirsutum L. yield as affected by early season pests infesting alluvial soil within the Commerce-Bruin-Dundee soil series in Louisiana, USA. Novel methodology helped determine the effect of nematicide and selected fertility management practices on cotton lint yield collected from research plots and an on-farm test. In the small plot research test, data collected for thrips, nematodes and yield is analyzed using geo-referenced data points. Yields were significantly better in fumigation and nematicide seed treatments as compared to the non-treated plus high fertility management strategy that contained 144 kg/ha N, but more variation in yield occurred in the fumigation treatment with lower fertility management. In an embedded field trial that included three fertility management strategies (96, 138, 162 kg/ha N) applied with and without fumigation, linear mixed models analysis of co-variance techniques resulted in prescriptions for site-specific management of fumigation and fertilizer whereas conventional analysis could not be used for site-specific management.
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