Detail Dribbles and Bits   Oleh:  [s.n] Jenis: Article from Bulletin/Magazine Dalam koleksi: The Economist (http://search.proquest.com/) vol. 403 no. 8787 (Jun. 2012), page S4-S5. Topik: Irrigation; Agricultural Engineering Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.72 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel From the air, the Flint river basin in south-western Georgia shows a strange tendency for the basin's crops to grow in circular patches. This is caused by the way they are watered, for the predominant system employs sprinkler heads attached to hoses that dangle from wheeled trusses which move in a circular pattern around a central tower. The whole arrangement is portable, and can thus be transported from field to field in order to water a whole farm. Centre-pivot irrigation, as this system is known, is reasonably effective. But it is a one-size-fits-all approach to distributing water. Craig Kvien, of the University of Georgia, thinks he can do better. In 1999 Dr Kvien came up with the idea of varying the amount of irrigation water applied across a field, in light of a detailed examination of that field's characteristics. In collaboration with FarmScan AG, an Australian manufacturer of agricultural equipment, he and his colleagues have developed this approach into a technique called variable-rate irrigation (VRI). More than 80 farms in Georgia now use it. Farmers in Australia, Germany, New Zealand, South Africa and Spain are taking an interest, and two other firms--Zimmatic and Valley Irrigation, both based in Nebraska--have joined FarmScan AG in selling the kit. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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