Nitrate fertilisers

Long-term field trials in England have shown that N efficiency of cattle slurry applications declined once the application rate exceeded pasture plant requirements [7], The cattle slurry was reported to be 90% as efficient as ammonium nitrate fertiliser when applied at 300kg N/ha compared with 63% efficient at 600kg N/ha and that the efficiency varied with season of application, being most effective in spring. 

Nitric acid used in explosives, nitrate fertilisers and in electroplating units... 

The same is trae of the project for fruit tree growing (INRA Gotheron) where infestation by apple tree greenfly, nitrate fertilisation and the nitrate content of the soil, and the ecology of auxiliary insects close to hedgerows are being investigated at one and the same time. 

By the end of the nineteenth century it had become clear that a crisis was looming in agriculture. The warning was most forcefully made in 1898 by William Crookes in a speech to the British Association when he pointed out that the vast nitrate deposits in Chile were being exploited at such a rate that they would be exhausted within a generation. Without the application of nitrates to the land, crop yields would fall dramatically and food shortages would be inevitable. There was clearly a need to develop a process to fix atmospheric nitrogen to enable nitrate fertilisers to be made artificially. 

Ammonium Nitrate Fertiliser with 2069 43 Amyl Chlorides 1107 26... 

Chemical reactions can also cause the release of oxygen, particularly chemicals such as ammonium nitrate (fertilisers), sodium chlorate (pesticides), hydrogen peroxide (water treatment, hair care) and chromate (variety of Industrial processes). 

The most commonly used liquids are solutions of nitrate fertilisers (containing between 36 and 40 kg nitrogen per hectolitre), but solutions of superphosphate 14-48-0 (14 kg nitrogen and 48 kg phosphoros per hectolitre) are also used. These solutions are generally slightly acidic (pH between 6 and 7). 

Sohd fertilisers are more or less hygroscopic and deliquescent, depending on their composition. In the presence of humidity, the prolonged contact with the granules or fertiliser dust can lead to a pitting attack on aluminium. This attack is slight with nitrate fertilisers, and the more severe the attack is, the richer the fertiliser is in phosphoros. Superphosphates are very aggressive. 

Solutions of nitrate fertilisers, even highly concentrated, have no action on aluminium, as long as their pH is maintained between 6 and 7 [1]. The annual decrease in thickness of 3003 in contact with a solution containing 400 g-l of nitrogen is below 10 p.m, even at slightly elevated temperatures of 40-50 °C (Figure G.3.1). 

Granulated fertilisers are transported in bulk in aluminium tippers. Solutions of nitrate fertilisers can be transported and stored in aluminium tanks. 

Work out the percentage of nitrogen in ammonium nitrate fertiliser. 

UNIDO. 1998. Fertilizer Manual. Dordrecht Kluwer Academic, p. 221 Eben, A., and P. Kaupas. 1998. Ammonium nitrate production and operational experience. Nitrogen Methanol 235 25-30 Shah, K. D. 1996. Safety of Ammonium Nitrate Fertilisers. Peterborough Fertiliser Society. 

Forman, D. 1987. Gastric cancer, diet, and nitrate exposure. British Medical Journal 294 528-529 Al-Dabbagh, S., et al. 1986. Mortality of nitrate fertiliser workers. British Journal of Industrial Medicine 43 507-515 National Research Council. 1982. Diet, Nutrition, and Cancer. Washington, D.C. National Academy Press. 

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