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One-Time Tillage of No-Till Systems

Soil Physical Properties, Phosphorus Runoff, and Crop Yield

^a INIA La Estanzuela, CC 39173 Colonia, Uruguay
^b 279 Plant Science, Univ. of Nebraska-Lincoln, Lincoln, NE 68583-0915
^c Dep. of Biosystems Engineering, Univ. of Nebraska-Lincoln, Lincoln, NE 68583-0726

View larger version (25K): [in this window] [in a new window]   Fig. 1. Runoff P concentration during a 12-min simulated rainfall at 23 to 30 mo after one-time tillage of continuous no-till at two locations (the Rogers Memorial Farm, RMF; and the Agricultural Research and Development Center, ARDC) in eastern Nebraska. The P fractions were dissolved P (white bars) and particulate P (shaded bars). The Y-bars indicate the SEs. Differences between tillage treatments within sites are denoted by lowercase letters for dissolved or particulate P and by uppercase letters for total P (P = 0.05).

View larger version (24K): [in this window] [in a new window]   Fig. 2. The amount of runoff P loss during a 12-min simulated rainfall at 23 to 30 mo after one-time tillage of continuous no-till at two locations (the Rogers Memorial Farm, RMF; and the Agricultural Research and Development Center, ARDC) in eastern Nebraska. The P fractions are dissolved P (white bars) and particulate P (shaded bars). The Y-bars indicate the SEs. Differences between tillage treatments within sites are denoted by lowercase letters for dissolved or particulate P and by uppercase letters for total P (P = 0.05).

View larger version (18K): [in this window] [in a new window]   Fig. 3. Phosphorus losses in (a) dissolved and (b) particulate fractions vs. runoff volume as a ratio of total rainfall. Samples were collected periodically during a simulated 12-min rainfall events that delivered, on average, a total of 64 mm at Rogers Memorial Farm (RMF, closed symbols) and 76 mm at the Agricultural Research and Development Center (ARDC, open symbols).