1/28/2024 0 Comments Liquid fertilizersBut avoid broadcast application to rapidly growing crops. Nitrogen solutions are popular for grasses and small grains. This loss can be lessened if you get rain in 2 to 3 days. A great deal of the applied nitrogen can be lost to the crop at air temperatures above 70 degrees. Avoid broadcast sprays of UAN solutions on hot, dry days unless the material will be cultivated or irrigated in, or rain is imminent. Each has advantages and disadvantages.īroadcast spray. Most suspension fertilizers are broadcast sprayed, but in some situations, broadcast sprays are not advisable. Fluid Fertilizer Application Methodsįluid fertilizers are usually applied by broadcast spray, dribble, knife-in, or starter placement. These suspending agents (for example, xanthan gum products) are usually more expensive than the clays otherwise used in formulating fertilizers. If the application contains paraquat, you must use suspending agents without negative charges. Some contact herbicides, such as paraquat, are deactivated by binding to negatively charged clays. There is no standard analysis, because almost any grade of suspension fertilizer can be blended. Suspensions settle out if not used soon after blending. More potash may be in a suspension fertilizer because it does not have to go into solution to stay dispersed in the liquid. Suspending agents, such as attapulgite clay, prevent the fertilizer material from settling out. Suspension fertilizers hold the fertilizer in a suspension, much like mud in water. Most fluid fertilizers containing greater than 9 percent potash are suspension fertilizers. Solution fertilizers are low in potash because no more than 11 percent potash will go into solution, and 9 percent is more practical to manufacture. Weights and salting-out temperatures are available from vendors. Other solution fertilizer grades are available. It weighs 11.1 pounds per gallon and has a salting-out temperature of about 0☏.Īmmonium polyphosphate dissolved in water (10-34-0 and 11-37-0) is used as a starter fertilizer in row crop production. It is manufactured by adding ammonium thiosulfate to UAN. Use it where a response to sulfur is expected, such as on sandy textured, low organic matter soils. Twenty-eight percent (28-0-0-5) contains 5 percent sulfur in addition to the nitrogen. Thirty-two percent UAN (32-0-0) weighs 11.06 pounds per gallon and salts out (solids separate from the liquid) at 32☏. When used in reduced tillage, larger droplets help slow losses by volatilization. Avoid surface applications in hot, dry weather. Because of the urea content, to avoid volatilization losses of nitrogen (N) to the atmosphere, you must follow the same constraints in managing UAN as you do for dry urea. Urea-ammonium nitrate solutions (UAN) are urea and ammonium nitrate dissolved in water. Suspension fertilizers should be applied the day they are blended. True solution fertilizers can be stored as long as the temperature stays above freezing. Suspension agents (typically a clay material) are used in suspension fertilizers to keep the fertilizer material from settling out. Suspension fertilizers are partially dissolved in water, but some of the nutrients, particularly potash, are suspended in the water in the same way mud is suspended in water. Solution fertilizers are dissolved completely in water. The major types of fluid fertilizers are suspension fertilizers and solution fertilizers. The efficiency of fluid fertilizers is determined by the way they are applied. The only difference is that fluid fertilizers are dissolved in water, and dry fertilizers are not. Most fluid fertilizers contain the same basic ingredients as dry fertilizers. Properly applied, fluid fertilizers are no more or less efficient than dry fertilizers. Fertilizers custom blended to specifications are available. Some pesticides can be injected into the fluid, saving trips across the field. Movement is by pump, and they usually require less labor to handle. Fluid fertilizers are easy to handle and use.
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