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Irrigation Systems and Nutrient Sources for Fertigation

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Irrigation Systems and Nutrient Sources for Fertigation Soil and Crop Management May 2009 SCM-25 Irrigation Systems and Nutrient Sources for Fertigation A. Fares and F. Abbas Department of Natural Resources and Environmental Management dvances in micro-irrigation techniques have facili- ing. On the other hand, low-volume irrigation systems tated greater adoption of the application of fertil- apply water only to the soil around the plants; therefore, izersA to crops through irrigation water; the technique is agrichemicals can be more effectively applied with such termed as fertigation. If fertilizers are applied through systems. Because the infiltrating water dispenses the irrigation systems, savings of 29–78% in application fertilizer in the soil, fertilizer distribution depends on the costs may result due to the improved efficiency of fertil- water flow pattern in the particular soil (Hanson et al. izer application, low fertilizer leaching, precise nutrient 2006). Under flood irrigation, most of the water move- application, and right-amount and right-time fertilizer ment is due to gravity, resulting in excessive drainage. application. Although no significant increases in crop More nutrients may be needed for flood-irrigated fields yield have been reported (Alva et al. 2005), uptake of than those irrigated with low-volume systems (Thompson major plant nutrients, i.e., nitrogen, phosphorous, and po- et al. 2000), which retain the applied water, and hence the tassium, is higher with fertigation than with conventional nutrients, in the plant root zone (Fares and Alva 2000). methods (Papadopoulos 1988). This publication details Pressurized irrigation systems offer the ability to use selection of a suitable irrigation system and compatible high-frequency fertigation (Boman and Obreza 2002). chemicals for efficient fertigation practices. High irrigation water application efficiency associated with negligible deep percolation in drip irrigation systems Selection of an irrigation system for makes them ideal for fertigation. Because drip irrigation fertigation systems apply controlled and precise amounts of water Irrigation systems are selected based on their water use to the field, negative impacts (i.e., surface runoff, soil efficiency, which varies with the soil properties and crop erosion, deep percolation, and nutrient loss) are avoided. characteristics rather than the application system itself. Prescribed chemical application, reduced application Irrigation systems are categorized by their irrigation cost, minimum operator hazard, no soil compaction, and efficiency, defined as the volume of water beneficially less plant injury are among the important advantages of used by the plants relative to the volume delivered by the fertigation through drip irrigation systems compared to system (Jensen 2007). Sprinkler and drip systems have foliar fertigation via above-ground sprays (Vieira and substantially high irrigation efficiencies (60–70% and Sumner 1999). 80–90%, respectively) than that of traditional surface flooding (50–60% efficiency) (Nir 1982, Smajstrla et al. Common sources of nutrients for fertigation 1991). Flood irrigation techniques utilize more water compared to low-volume, pressurized irrigation systems. Nitrogen and nitrogen sources In flood irrigation, the water is directed and controlled by constructed basins, borders, and/or furrows. During flood Nitrogen (N) is an essential prerequisite for almost all irrigation, the applied water percolates through the plant crops and is ideal for fertigation due to its complete root zone, resulting in losses of applied nutrients to leach- dissolution in irrigation water. Urea, ammonium nitrate Published by the College of Tropical Agriculture and Human Resources (CTAHR) and issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in coopera- tion with the U.S. Department of Agriculture. Andrew G. Hashimoto, Director/Dean, Cooperative Extension Service/CTAHR, University of Hawai‘i at Mānoa, Honolulu, Hawai‘i 96822. An equal opportunity/affirmative action institution providing programs and services to the people of Hawai‘i without regard to race, sex, age, religion, color, national origin, ancestry, dis- ability, marital status, arrest and court record, sexual orientation, or status as a covered veteran. CTAHR publications can be found on the Web site <http://www.ctahr.hawaii.edu/freepubs>. UH–CTAHR Irrigation Systems and Nutrient Sources for Fertigation SCM-25 — May 2009 . (NH4NO3), calcium nitrate (5Ca[NO3]2 NH4NO3), potas- it will decompose into elemental S and (NH4)2SO4. Ap- sium nitrate (KNO3), and ammonium sulfate ([NH4]2SO4) plication of this fertilizer to neutral or acidic soils may are some of the examples of N-containing sources. The result in drastic decreases in soil pH over time. The extent N fertilizers are extensively used to prepare single- or of pH drop varies with the soil type and with the amount multi-nutrient fertilizer solutions. Generally, pH-neutral of fertilizer applied. N sources (i.e., Ca[NO3]2, KNO3) are used as N fertil- izer materials in fertigation practices. For high-pH soils, Urea acidic sources are useful because they have the potential Urea is commonly available as a dry, solid fertilizer of reducing soil pH. Common N content sources are (46-0-0) or as a liquid solution (23-0-0). Commercially given below. available urea contains about 2.25% biuret, a byproduct that is formed during the manufacturing process. For Ammonium nitrate solution (20-0-0) [NH4NO3] foliar application, urea with less than 0.25% biuret is Ammonium nitrate fertilizer is one of the most common recommended, as a higher percentage of biuret can and widely used sources of N. It can be dissolved in water inhibit plant growth. at a density of 1.26 kg/L (10.5 pounds per gallon). Urea sulfuric acid [CO(NH2)2 H2SO4] Urea-ammonium nitrate solution (32-0-0) This is an acidic fertilizer that combines urea and sulfuric . [(NH2)22CO NH4NO3] acid. When urea is applied to soil, it increases the soil This source of N is manufactured by combining urea pH and enhances N losses via ammonia volatilization. (46% N) and ammonium nitrate (35% N) on an equal N Combined application of urea and sulfuric acid reduces content basis. Of the available N sources, urea-ammo- both ammonia volatilization and soil pH, and thereby nium nitrate has the highest N concentration. Calcium reduces the ammonia damage to plant roots that occurs nitrate is not generally used with urea-ammonium ni- when only urea is used as a nutrient source. trate, to prevent the formation of insoluble, milky white precipitates that potentially could clog irrigation lines. Potassium nitrate (13-0-46) [KNO3] Potassium nitrate is an expensive fertilizer component Calcium nitrate (15.5-0-0-19 Ca) compared with other K sources. It is an excellent choice . [5Ca(NO3)2 NH4NO3] of potassium fertilizer for areas with highly saline irriga- Calcium nitrate is a rich in nitrate N (NO3-N) with 1% tion water. Potassium nitrate is less soluble than KCl but of ammonium-N (NH4-N) and calcium (Ca). Calcium more soluble than K2SO4. nitrate can be mixed with NH4NO3, magnesium nitrate (Mg[NO3]2), KNO3, and muriate of potash (KCl). How- Phosphorus and phosphorus sources ever, this product should not be mixed with any products containing phosphate, sulfates, or thiosulfates, to avoid Plants generally need phosphorus (P) early in their life the formation of insoluble precipitates that may result in cycle, which makes P an important pre-plant amendment plugging problems in low-volume drip, trickle, or micro- if already deficient in the soil. Later-stage application of jet irrigation systems. P via fertigation is adopted if P deficiency symptoms ap- pear in plants any time during the growing season. Phos- Ammonium thiosulfate (12-0-0-26) [(NH4)2S2O3] phorous is the most critical element used in fertigation Ammonium thiosulfate (ATS) is used as an acidulating because of its solubility in water, especially in presence agent. When ATS is applied to the soil through fertiga- of other nutrients, such as calcium (Ca). Most of the com- tion, sulfur-oxidizing bacteria, Thiobacillus spp., oxidize mercially available fertilizers contain phosphoric acid free sulfur (S) to form sulfuric acid (H2SO4). Gypsum is (P2O5) as water-soluble and citrate-soluble phosphate. formed upon mixing ATS with a lime-rich calcareous Because P is not easily dissolved in irrigation water, it soil. Gypsum helps maintain good soil structure. ATS is less likely to leach through many soils. Phosphorous can be mixed with neutral or alkaline phosphate liquid attached to eroded soil particles can be transported fertilizers or with other N fertilizers. However, it should to water bodies via surface runoff, causing pollution. not be mixed with acidic compounds due to the fact that It is important to know that injection of P fertilizers 2 UH–CTAHR Irrigation Systems and Nutrient Sources for Fertigation SCM-25 — May 2009 into irrigation systems may cause emitter plugging due Potassium thiosulfate (0-0-25-17) and (0-0-22-23) to the formation of precipitates when P is mixed with [K2S2O3] certain fertilizers. For irrigation water rich in Ca and Potassium thiosulfate, usually available in two grades, Mg (magnesium), solid precipitation in the irrigation is a neutral to basic, clear, liquid solution. This fertil- lines is expected if P is used in fertigation. Most of the izer can be blended with other fertilizers, except acidic dry phosphorus fertilizers (e.g., ammonium phosphate blends (i.e., pH <6.0). In order to avoid the formation of ([NH4]3PO4) and superphosphates) are not injected with precipitates, it is always useful to conduct small blending irrigation water due to their low solubility in the water. tests in a jar prior to injection. The P fertilizers, such as mono-ammonium phosphate (MAP), di-ammonium phosphate (DAP), mono basic Other nutrients and their sources potassium phosphate, P2O5, liquid ammonium polyphos- phate, and urea phosphate, are water soluble and can be The majority of metal micronutrients are not used in used in fertigation. fertigation due to their low solubility in water.
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