Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2002-2004
1 Fluid Journal Winter 2003 I IIII What About Starter Placement in High Phosphorus Soils by F. Ronald Mulford Summary: In most situations, corn grain yields are higher where starters are placed in the row when compared to broadcasting. Dribbling starters, over the row behind one of the closing wheels, seems to be as efficient as 2 x 2 placement. In wheat, it appears yields decrease if more than 20 lbs/A of nitrogen (N) is applied in-row. Excepting this 20-lb rate, it appears all surface-applied starter rates performed better than the in-row treatments. n Maryland on some soils testing excessively high in phosphorus (P2O5) and considered environmentally sensitive using the P index system, little or no phosphorus fertilizer will be allowed. Thus a new project not reported here is being proposed to answer what effect using Maryland researcher takes a look at alternative methods of placing starters in soils testing excessively high (above 205lbs/A of P2O5). starters with no P will have on yield. Also, as corn planters get bigger the equipment for the traditional 2 x 2 starter placement is adding cost and in some situations excessive weight. For these reasons and others we are in search of alternative methods of placing solution starters over the row but directly behind the planter closing wheels. In this article we will review studies on corn and wheat. Corn Our objective here was to evaluate the influence of starter placement using a recommended phosphorus level on high P soils at two nitrogen rates. Fertilizer rates. Starter N rates were 8.5 and 25 lbs/A, each combined with 20 lbs/A of P2O5, 5 lbs/A of potassium (K2O), 1 lb/A of sulfur (S), .6 lb/A zinc (Zn), and .13 lb/A of boron (B). N rate was starter N plus additional sidedressed N when corn was at 5th leaf stage to give a total of 80 lbs/A. Helena HM9840 was also added to some in-row treatments. Placement. Starter placement methods were broadcast, 2 x 2, in-row, and dribble over the row behind one of the closing wheels. Planting. A John Deere 6-row conservation tillage unit planter was used, which had been modified to apply fluid starters five different ways. A typical comparison in our studies is shown in Figure 1. In most cases corn grain yields were higher when a corn starter was placed near the row, compared to broadcasting. Overall, dribbling the starter over the row behind one of the closing wheels seemed to be as efficient as the traditional 2 x 2 placement. 0 10 20 30 40 50 60 70 80 0 20 40 60 N-lbs/A Yield-bu/A Broadcast In-row No fall N, just P&K Figure 2. Effect of varying starter N rates and placement methods on wheat yields, University of Maryland, 2001. 50 60 70 80 90 100 110 120 130 Check 2x2 B'cast Dribble In-row In-row Check = No P&K, additional N only Yield-bu/A 8.5-20-5-1S-.6Zn-.13 B 25-20-5-1S-.6Zn-.13 B Two Starters Above + HM9840 Figure 1. Effect of varying starter N rates and placement methods on corn yields, University of Maryland, 2001.
Fluid Journal 1999-2001
Fluid Journal 2005-2007