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Placement of Preplant Liquid Nitrogen and Phosphorus Fertilizer and Nitrogen Rate Affects No-Till Wheat Following Different Summer Crops

Kansas State Univ., Southeast Agric. Res. Center, P.O. Box 316, Parsons, KS 67357

View larger version (30K): [in this window] [in a new window]   Fig. 1. Influence of previous crop, N and P fertilizer placement method [subsurface-knife (KN), surface-band (SB), and surface-broadcast (BC)], and N rate on no-till wheat grain yield in 1999, 2001, and 2003 at Parsons, KS.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Relative no-till wheat grain yield following corn, grain sorghum, and soybean as a function of soil + fertilizer N for the years 1999, 2001, and 2003 at Parsons, KS. Regression equations and significance for wheat following corn: [subsurface-knife (KN): y = 27.5 + 0.899x – 0.00286x2 (R2 = 0.96, P = 0.001); surface-band (SB): y = 29.8 + 0.746x – 0.0022x2 (R2 = 0.83, P = 0.001); surface-broadcast (BC): y = 31.4 + 0.617x – 0.0016x2 (R2 = 0.83, P = 0.001)]. For wheat following grain sorghum: [KN: y = 27.8 + 0.703x – 0.00167x2 (R2 = 0.91, P = 0.001); SB: y = 22.0 + 0.51x – 0.000518x2 (R2 = 0.83, P = 0. 001); BC: y = 24.9 + 0.317x – 0.000321x2 (R2 = 0.79, P = 0.01)]. For wheat following soybean: [KN: y = 16.7 + 1.07x – 0.00352x2 (R2 = 0.94, P = 0.001); SB: y = 35.7 + 0.575x – 0.00131x2 (R2 = 0.94, P = 0.001); BC: y = 42.1 + 0.417x – 0.000801x2 (R2 = 0.84, P = 0.001)].

View larger version (25K): [in this window] [in a new window]   Fig. 3. Influence of whole-plant N and P uptake and total grain N on no-till wheat grain yield for the years 1999, 2001, and 2003 at Parsons, KS. Regression equations and significance for plant N uptake:[corn: y = –0.202 + 0.0775x – 0.00029x2 (R2 = 0.93, P = 0.001); grain sorghum: y = –0.504 + 0.0864x – 0.000326x2 (R2 = 0.91, P = 0.001); soybean: y = –0.605 + 0.0851x – 0.000336x2 (R2 = 0.92, P = 0.001)]. For plant P uptake: [corn: y = –0.912 + 0.454x – 0.0088x2 (R2 = 0.88, P = 0.001); grain sorghum: y = –0.81 + 0.422x – 0.00723x2 (R2 = 0.83, P = 0.001); soybean: y = –1.10 + 0.485x – 0.00977x2 (R2 = 0.81, P = 0.001)]. For total grain N: [corn: y = –0.42 + 0.093x – 0.00035x2 (R2 = 0.88, P = 0.001); grain sorghum: y = –0.72 + 0.107x – 0.000458x2 (R2 = 0.95, P = 0.001); soybean: y = –2.078 + 0.144x – 0.000753x2 (R2 = 0.89, P = 0.001)].