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Nitrate Poisoning, Fire Retardants, and Fertilizers-Any Connection?'

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Nitrate Poisoning, Fire Retardants, and Fertilizers-Any Connection?' Nitrate Poisoning, Fire Retardants, and Fertilizers—Any Connection? Item Type Article; text Authors Dodge, M. Citation Dodge, M. (1970). Nitrate poisoning, fire retardants, and fertilizers —any connection?. Journal of Range Management, 23(4), 244-247. DOI 10.2307/3896213 Publisher Society for Range Management Journal Journal of Range Management Rights Copyright © Society for Range Management. Download date 29/09/2021 18:46:50 Item License http://rightsstatements.org/vocab/InC/1.0/ Version Final published version Link to Item http://hdl.handle.net/10150/649994 Nitrate Poisoning, Fire Retardants, dition as the salt concentration was diluted down to a tolerable level. In a potentially more serious and Fertilizers-Any Connection?’ case, ammonium sulphate salt was washed into a pasture. Shortly thereafter, several animals died MARVIN DODGE with symptoms of nitrate toxicity.G This paper reviews the possible toxic effect of Slate Forest Ranger, California lhision of Forestry, ammonium phosphate and sulphate fire retardants assigned to the Pacific, Southwest Forest and to domestic animals and wildlife. It describes the Range Experiment Station, Forest Service, U.S. ljepartmen t of Agriculture, chemical change of ammonium phosphate and Berkeley, Calif. sulphate into nitrate and the probability of this occurring under natural conditions. And it dis- cusses the probability of animals getting nitrate Highlight and nitrate poisoning from other sources. Fire retardants used in combating forest and range fires have been accused of killing livestock by nitrate poisoning. Nitrate Poisoning Ammonia-based retardants cannot cause nitrate poisoning Most fertilizers and fire retardants are ammo- directly. They must first enter the soil, be converted to nitrates, then be absorbed and accumulated by plants. This nium-based. The ammonium salts must be changed process occurs only under special climatic conditions and to nitrates in the soil, absorbed by plants, and eaten requires two to three weeks. The possibility of injury to by animals before nitrate poisoning can occur. livestock from fire retardant materials is very slight-much And at each stage of this three-step process-from less than that from a range or pasture fertilization program. soil to plant to animal-the excess accumulation of nitrates can be halted. No phase of forest fire control has developed as Nitrification in the Soil rapidly, or changed so drastically, as the use of fire retardant chemicals. Retardants dropped by air Nitrification, the first stage, is the oxidation of tankers have brought about a complete revolution ammonium salts to nitrate. Nitrification is almost in firefighting methods. Properly used, they can entirely a bacterial activity and only takes place in be valuable tools in the constant fight against loss soil. It is a two-step process, accomplished by two of natural resources by fire. separate micro-organisms: Nitrosomonas oxidizes Since the introduction of the ammonium-base ammonia to nitrite, NH3 + N02-; and Nitrobacter retardants, a few isolated cases of damage to crops oxidizes the nitrite to nitrate, N 02- += N OS- and animals have been reported. Some of these (Thimann, 1963). Both nitrate (NOs-) and am- cases have been injury or physical damage to crops monia (NH,) are relatively nontoxic to animals and ready for market. For example, one air tanker humans. jettisoned a load of retardant over a pear orchard Both Nitrosomonas and Nitrobacter are strictly in northern California. The retardant caused skin aerobic-they function only in a well-aerated en- blemish on the ripening fruit, resulting in a de- vironment (Fry, 1955). The amount of nitrate pro- grade of the crop. s A similar incident occurred duced from the ammonium-based fertilizers de- when a load was jettisoned over an apple orchard pends on the amount of oxygen present in the soil. in Washington. None of these incidents resulted Amer and Bartholomew (195 1) treated soil sam- in any permanent damage to the trees. In fact, they ples with ammonium sulphate and exposed them probably had an over-all fertilizing effect on the to air streams of varying oxygen content. After 21 orchards, although the growers involved suffered a days, the level of nitrate was highest in the highest one-time crop loss in the area covered by the drop concentration of oxygen tested (20y0). At low pattern. There have also been several reports of oxygen levels there was very little nitrate. As the fish killed when retardants were dropped directly oxygen level approached zero, the nitrate level was into streams. In one case, the fire retardant in- zero, indicating reduction or denitrification of creased the salt content of the water for several nitrate originally present in this soil. hundred feet downstream, killing a number of Denitrification by micro-organisms is especially trout.4 However, this condition was only tempo- common when soil remains saturated with standing rary, and the stream soon returned to normal con- water for any considerable period of time. Thimann (1963) reported that in waterlogged soils, such as l Received February 23, 1968; accepted for publication flooded rice fields, nitrate often disappears com- January 22, 1970. pletely and ammonia may accumulate. When the 2 Author stationed at Riverside, California. soil dries out again, and aerobic conditions prevail, 3 Correspondence on file, State Forester’s Office, California Division of Forestry, Sacramento, California, August- nitrate may reappear. October, 1964. 4Correspondence on file, State Forester’s Office, Sacramento, 5Letter to Forest Supervisor, Lassen National Forest, No- California, July-September, 1966. vember 30, 1966. 244 NITRATE POISONING 245 Once the ammonium-based fertilizers have been have also been involved. Kingsbury (1964) lists 47 changed to nitrates in the soil, they can be absorbed different species of weeds and 21 crop plants that by plants. But plants vary widely from one species have been responsible for nitrate poisoning or have to another in their uptake and use of nitrogen. In shown high nitrate levels. Workers in California general, plants may absorb nitrogen either as ni- (Tucker et al., 196 1) have compiled a list of 64 trate or as ammonium salts. They use ammonium species of plants responsible for nitrate poisoning best at a neutral, or alkaline soil reaction and or showing high nitrate levels. Crop plants include nitrates in an acid medium (McKee, 1962). oat hay, corn, alfalfa, beets and Sudan grass. Nitrate absorption by plants depends not only Kingsbury (1964) reported that most workers on the amount of nitrate in the soil, but also de- agree that nitrate levels above 1.5% of the plant pends upon the kinds and amounts of other ions weight may prove lethal. Lewis (1951) found ni- present (Crawford and Kennedy, 1960; McKee, trate levels rangin from 3.2 to 7.2% in oat hay 1962). A high concentration of phosphate in the that had caused poisoning. Whitehead and Moxon soil impedes the absorption of nitrate. There is (1952) report nitrate levels as high as 5.80/, in oat also an indication that high chloride content may hay, 3.la/o in wheat hay, but only 0.7% in native depress the uptake of nitrates by certain plants. grasses. Eight species of weeds had nitrate levels Potassium, manganese, and sulphur deficiencies of 4.2 to 7.7%,, with an average of 6.0%). lead to nitrate accumulation (McKee, 1962). Nitrates in Animals Light intensity and temperatures affect the ni- trate content of plants. In New Zealand, Bathurst Most animals, including humans, can get nitrate and Mitchell (1958) f ound nitrate content highest poisoning. Animals that chew their cud (rumi- with low light and high temperatures and lowest nants) are especially susceptible because they har- with high light intensity and low temperatures. bor micro-organisms in their rumen (Tucker et al., Crawford and Kennedy (1960) also found nitrates 1961; Whitehead and Moxon, 1952). increasing in low levels of light. McKee (1962) Nitrate poisoning is actually poisoning by ni- believed that nitrate use was affected by photo- trite. When forage-* has a normai nitrate .iontent, synthesis by the plants, since nitrate accumulates nitrate is reduced to ammonia in two steps (Fig. 1): in plants held in the dark. Drought occurring late in the growth cycle also SOIL REACTION -----------~ Lost to leads to nitrate accumulation (Crawford and I-- t Kennedy, 1960; Whitehead and Moxon, 1952). Ammonium Salt Plant treatment by 2,4-D, or related compounds, (FIW Retardant) may cause problems with nitrate. The 2,4-D pro- duces two results: (1) an upset in the plant’s nitro- gen metabolism may cause an increase in the ni- trate level of the plants, and, (2) the treatment increases the palatability of weeds high in nitrates that would not ordinarily be eaten by animals (Kinqsbury, 1964; Whitehead and Moxon, 1952). Tile growth stages of plants influence nitrate content-nitrates are generally highest in imma- ture plants. Nitrate concentration decreases as plants mature (Crawford and Kennedy, 1960; Ken- nedy, 1958). Nitrate accumulations are normally found in the vegetative parts of the plant. The nitrate levels of stems are normally highest and next in leaves, whereas grain or seeds have a fairly low nitrate content. Some plant species are more likely to cause ni- trate poisoning than others. Oats seem to be one of the worst offenders-so much so that nitrate poisoning is referred to as “oat-hay poisoning” in many parts of the country (Kennedy, 1958; Kings- bury, 1964; Whitehead and Moxon, 1952). In studies in New York, Kennedy (1958) found that perennials accumulated less nitrate-nitrogen than annual grasses.., Most workers have found that weeds are the species most commonly associated ------------------------_--~ I with high nitrate levels, though many crop plants Flow diagram of nitrate and atnino acid conversion, 246 DODGE first, it is reduced to nitrite in the rumen of the is to mix the high nitrate feed with safe feed or animal; second, the nitrite is further reduced to forage to dilute the harmful concentration of ammonia, which is then absorbed and used to nitrate (Kingsbury, 1964; Tucker et al., 1961; synthesize amino acids and proteins that the animal Whitehead and Moxon, 1952).
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