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Relationships between Leaf-Blade Nitrogen and Relative Seedcotton Yields

^a Agronomy Dep., LSU AgCenter, Baton Rouge, LA 70803-2110
^b Northeast Res. Stn. at St. Joseph and Winnsboro, LA, LSU AgCenter
^c Red River Res. Stn., Bossier City, LA, LSU AgCenter
^d Dean Lee Res. Stn., Alexandria, LA, LSU AgCenter
^e MSU, Mississippi Agric. and Forestry Exp. Stn., Delta Research and Extension Center, Stoneville, MS
^f Dep. Agronomy and Soils, Auburn Univ., Auburn University, AL
^g Dep. Plant Soil Sciences, Mississippi State Univ., Mississippi State, MS
^h Noble Foundation, Ardmore, OK
ⁱ Consultant and formerly of LSU AgCenter
^j Agriculture Studies, Arkansas State Univ., State University, AR
^k Univ. Arkansas–Southeast Res. Ext. Ctr, Monticello, AR

View larger version (32K): [in a new window]   Fig. 1. Leaf N concentrations versus relative yields from N fertilization trials conducted in LA, MS, AR, and AL in 1996 and 1997. Results are presented for growth stages of first pin-head square (a), early bloom (b), mid-bloom (c), and cut-out (d). Our recommended critical values are presented as the vertical dotted line for early and mid-bloom growth stages. Correct diagnoses using these critical values are found in the bottom left and top right quadrants. At first pin-head square, some sites are represented as open squares (Brewton, AL), open triangles (Columbia, LA), and open diamonds (St. Joseph, LA).