AsianScientist (Feb. 7, 2017) – Nanoparticle-based slow-release fertilizer could help reduce the amount of fertilizer used while improving food production in developing nations. A study describing a method to create this environmentally-friendly solution has been published in ACS Nano.
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.
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.
Furthermore, 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. In the present study, a team of researchers led by Dr. Nilwala Kottegoda from the Sri Lanka Institute of Nano Technology 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.
The article can be found at: Kottegoda et al. (2017) Urea-Hydroxyapatite Nanohybrids for Slow Release of Nitrogen.
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Source: American Chemical Society; Photo: Shutterstock.
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