| jbgruver - 11/22/2009 22:16 As shown in the first photo which follows, the radishes that we drilled on 30" rows (2.5 lbs radish/ac with 1.5 bu oats/ac in the interrow) are all deep green in color whereas the radishes drilled on 7.5" (10 lbs/ac) are lighter in color and there are some streaks of much yellower plants. I think the yellowing is related to the wetness this fall but also to competition for N at the higher density of radish. -- Joel: There could be moly or S deficiency involved, since brassicas have such enormous demand for those nutrients as compared to most other crops grown in this part of the world. On a per-acre basis, a pure stand of brassica (radish, etc) would more quickly and visibly outstrip the S and Mo supply, whereas a brassica + oats mix would need less (oats doesn't require nearly so much of those nutrients). Assuming, of course, that the total biomass of radish in the pure stand was double or triple (or more) what it was in the 30-inch alternate planting with oats. Anyway, just a thought. N def may explain it, but sometimes things aren't so simple or obvious. |
Our tillage radish crop so far
