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A wireless soil probe that measures soil conditions every 15 minutes could help farmers to apply fertilisers more efficiently and prevent overwatering. Each probe has 23 sensors and sends data to a software interface that summarises the information for farmers. Factors measured include levels of nitrogen, phosphorus, potassium, pH, moisture, temperature and aeration.

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Image: USDA NRCS Montana, Irrigation31.tif, Flickr, Public domain

Read the full story here. See also the Foodsource resource How do food systems contribute to water pollution?