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Liquid Fertilizers for Pastures
Liquid Fertilizers for Pastures. According to Michigan State University Extension, the term liquid fertilizer refers to anhydrous ammonia, aqua ammonia, N solutions and liquid-mixed fertilizers. The liquid fertilizer may be a true solution, requiring no agitation, or a slurry-type mixture that requires constant stirring. Pasture grasses respond to...
According to Michigan State University Extension, the term liquid fertilizer refers to anhydrous ammonia, aqua ammonia, N solutions and liquid-mixed fertilizers. The liquid fertilizer may be a true solution, requiring no agitation, or a slurry-type mixture that requires constant stirring. Pasture grasses respond to liquid and dry fertilizers in the same manner. Once applied, dry fertilizers absorb water from the soil and react in a similar way to liquid fertilizer. Several types of liquid fertilizers are appropriate for usage on pastures.
Nitrogen Fertilizers
Liquid nitrogen (N) fertilizers include anhydrous ammonia, aqua ammonia and N solutions. Neither anhydrous ammonia nor aqua ammonia are applicable on already established pastures as they must be incorporated below the ground surface in order to keep from releasing free ammonia into the atmosphere. Non-pressure N solutions, consisting of urea, 28 to 32 percent ammonium nitrate and water, are an excellent top-dressing during the spring, but often rank as poor during the summer months due to excessive N volatilization, according to the Purdue University Cooperative Extension Service. Also referred to as UAN mixtures, non-pressure nitrogen is usually included in weed-and-feed solutions.
Commercial Liquid Fertilizers
Commercial liquid fertilizers, or liquid-mixed fertilizers, are either purchased in a branded form or a custom mix according to soil needs. Most mixed fertilizers are a combination of nitrogen (N), phosphorus (P) and potassium (K). According to the Michigan State University Extension, the majority of liquid fertilizers containing P include a polyphosphate. Commercially available ammonium polyphosphates hydrolyze to orthophosphates by hydrolysis once in the soil, with 50 percent change within two weeks.
Liquid Manure
Livestock and poultry manure can be spread through a liquid application to provide nutrients and build soil fertility. There are specific considerations important when dealing with liquid manure, including environmental hazards and neighborhood concerns. Manure loses nitrogen during storage and application. Property owners and managers use a traveling gun liquid manure system for the application of liquid manures. Each batch of liquid manure may have different nutrient properties.
