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Nanoparticle fertilizer could contribute to new 'green revolution'

Date:
January 25, 2017
Source:
American Chemical Society
Summary:
The 'Green Revolution' of the '60s and '70s has been credited with helping to feed billions around the world, with fertilizers being one of the key drivers spurring the agricultural boom. But in developing countries, the cost of fertilizer remains relatively high and can limit food production. Now researchers report a simple way to make a benign, more efficient fertilizer that could contribute to a second food revolution.
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The "Green Revolution" of the '60s and '70s has been credited with helping to feed billions around the world, with fertilizers being one of the key drivers spurring the agricultural boom. But in developing countries, the cost of fertilizer remains relatively high and can limit food production. Now researchers report in the journal ACS Nano a simple way to make a benign, more efficient fertilizer that could contribute to a second food revolution.

Farmers often use urea, a rich source of nitrogen, as fertilizer. Its flaw, however, is that it breaks down quickly in wet soil and forms ammonia. The ammonia is washed away, creating a major environmental issue as it leads to eutrophication of water ways and ultimately enters the atmosphere as nitrogen dioxide, the main greenhouse gas associated with agriculture. This fast decomposition also limits the amount of nitrogen that can get absorbed by crop roots and requires farmers to apply more fertilizer to boost production. However, in low-income regions where populations continue to grow and the food supply is unstable, the cost of fertilizer can hinder additional applications and cripple crop yields. Nilwala Kottegoda, Veranja Karunaratne, Gehan Amaratunga and colleagues wanted to find a way to slow the breakdown of urea and make one application of fertilizer last longer.

To do this, the researchers developed a simple and scalable method for coating hydroxyapatite (HA) nanoparticles with urea molecules. HA is a mineral found in human and animal tissues and is considered to be environmentally friendly. In water, the hybridization of the HA nanoparticles and urea slowly released nitrogen, 12 times slower than urea by itself. Initial field tests on rice farms showed that the HA-urea nanohybrid lowered the need for fertilizer by one-half. The researchers say their development could help contribute to a new green revolution to help feed the world's continuously growing population and also improve the environmental sustainability of agriculture.


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Journal Reference:

  1. Nilwala Kottegoda, Chanaka Sandaruwan, Gayan Priyadarshana, Asitha Siriwardhana, Upendra A. Rathnayake, Danushka Madushanka Berugoda Arachchige, Asurusinghe R. Kumarasinghe, Damayanthi Dahanayake, Veranja Karunaratne, Gehan A. J. Amaratunga. Urea-Hydroxyapatite Nanohybrids for Slow Release of Nitrogen. ACS Nano, 2017; DOI: 10.1021/acsnano.6b07781

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American Chemical Society. "Nanoparticle fertilizer could contribute to new 'green revolution'." ScienceDaily. ScienceDaily, 25 January 2017. <www.sciencedaily.com/releases/2017/01/170125092109.htm>.
American Chemical Society. (2017, January 25). Nanoparticle fertilizer could contribute to new 'green revolution'. ScienceDaily. Retrieved March 23, 2017 from www.sciencedaily.com/releases/2017/01/170125092109.htm
American Chemical Society. "Nanoparticle fertilizer could contribute to new 'green revolution'." ScienceDaily. www.sciencedaily.com/releases/2017/01/170125092109.htm (accessed March 23, 2017).