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Fluid Journal : Fluid Journal 1993-1995
3 Fluid Journal Winter 1994 may be an advantage but will vary by soil type. Quite often, however, repeating what has been used will work just as well. For the long haul, it may be to the grower's advantage to till it more deeply occasionally. FJ: Would you say that starter fer tilizer is a good way of getting some P and K down? Yes,butnotforalotofthePandK, because it's not mixed with much soil. FJ: Instead of thinking of it as starter, we like to think of it as planter-applied nutrients. In other words, it gives us an opportunity to get some NPK and other elements under the residue. We've made several studies of root distribution with depth out from the row, measuring every two inches. We did this for no-till and for conventional tillage. The highest root density attained was what you might expect right in the row halfway between the plants. The next highest concentration of roots was midway between the rows, where you've got plant roots coming from both sides. A lot of people aren't aware of this. FJ: Under those conditions, side- dressing N down the middle would be a good program, wouldn't 'it? Yes, you don't need to put it closer to the row. FJ: We have more and more corn growers doing a lot of sidedressing. Does that sound logical? I would say so. You'll reach a lot of roots because corn roots tend to grow sideways as well as down. You get higher concentration of roots at mid-row even though corn rows are spaced far apart. However, when the plant doesn't grow very big you may not get that highest concentration of roots in the middle of the row. As I said before, with healthy plants, you have roots from both rows meeting in the middle.
Fluid Journal 1996-1998