For homemade fertilizer, chamber pot meets watering can

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Farmers around the globe are expected to use more than 170 million tonnes of fertilizer this year, according to a recent report from the International Fertilizer Industry Association, spending untold sums in the process. Swedish startup Guldkannan AB, however, believes the best fertilizer in the world is completely natural and free. That's because it's based on none other than human urine, an ancient gardening aid that's remarkably similar in composition to many fertilizers. Now, Guldkannan sells a device to help gardeners around the world put the nitrogen-rich power of urine to work in their gardens. Part chamber pot and part…

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