Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2002-2004
1 Fluid Journal Winter 2003 Evaluating Soil Fertility Production Practices for No-Till Cotton Fertilization by Dr. D D. Howard Summary: The West Tennessee studies described in this article suggest that fertilization practices for no-till (NT) cotton may be more flexible than for other higher residue, reduced tillage systems. Starter solutions containing either 11-37-0 or calcium nitrate boosted NT yields. Broadcasting the primary plant nutrients NPK was effective for increased NT yields. An additional 30 to 60 lbs/A of K2O was needed to produce NT yields comparable to conventional-till (CT) yields. Foliar K applications buffered to pH 4.0 were also effective in providing supplemental K and increasing lint yields on medium extractable K soils. utrient efficiency for crop production is stressed more today primarily to maximize fertilization efficiency for improving producers' profitability and to reduce any possible effects on the environment. Production practices promoting fertilizer use efficiency include timeliness of nutrient application, method of application, and nutrient sources. Starter on cotton Yield increases from starter applications for NT systems are influenced by a number of factors such as weather at planting, nutrient combination of the starter, and Researcher explores effects of starter, nitrogen, phosphorus, and potassium on cotton yields in different placement scenarios. placement method. Frequently used placement methods include 2 by 2 banding (applying starter 2 inches to the side and 2 inches below the seed at planting), surface banding (applying starter over the planted row as a 4-inch band), and in-furrow (IF) applications (in direct contact with seed). A major concern of the IF application is the possibility of ammonium toxicity affecting germination. Ammonium toxicity has been reported to result from a temporary calcium deficiency. Therefore, IF starters for cotton production should contain nitrate N. Research conducted in Tennessee indicates that the rate of fluid 11-37-0 applied IF as a starter should be limited to 1.5 gal/A. In this research, plant populations (not reported) and yields were reduced from IF applications of 3 and 4.5 gal/A of 11-37-0 compared to IF applications of 1.5 gal/A or banding 7.5 gal/A 2 by 2 or surface banding 7.5 gal/ A (Figure 1). Applying starters IF is an easy and convenient method for cotton production. Most producers have a liquid IF application system mounted on their planter for fungicide and insecticide applications. The need is for a material that can be applied IF with minimal detrimental effects on the germinating seed and is compatible with fungicides and insecticides. Applying liquid calcium nitrate appears to meet this criterion. Research conducted with calcium nitrate solution as an IF starter for NT cotton indicated that the solution could be applied over a N NN NN 850 900 950 1000 1050 1100 1150 1200 0 1.5 3 4.5 7.5 7.5 11-37-0-gal/A Yield-lbs/A Check In-Furrow 2x2 Surface Band Figure 1. Effect of starter (11-37-0) application on NT cotton yield, grown on a Loring silt loam at Milan, TN, 1992-1993.
Fluid Journal 1999-2001
Fluid Journal 2005-2007