Výsledky vyhledávání

Akademický článek

Soil type, crop and irrigation technique affect nitrogen leaching to groundwater

Autor: J Letey, P Vaughan

Publikováno v: California Agriculture, Vol 67, Iss 4 (2013)

Many groundwater resource in California are degraded by high concentrations of nitrate, most of which was transported to the groundwater in water percolating below the root zone of agricultural fields. Factors that affect the rate of water percolatio

Externí odkaz: https://doaj.org/article/442c69e6eb2b40f0a90bee75401d7c23

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Akademický článek

Soil salinity poses challenges for sustainable agriculture and wildlife

Autor: J Letey

Publikováno v: California Agriculture, Vol 54, Iss 2 (2000)

If soil becomes too saline, crop productivity falls. In California, the Imperial Valley and western San Joaquin Valley are major areas of concern where salinity can harm agricultural productivity. The Imperial Valley has achieved salt balance by disc

Externí odkaz: https://doaj.org/article/0b38cca111f947b299b6b3d6cefd95cc

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Akademický článek

Farmers adopt new irrigation and fertilizer techniques: Changes could help growers maintain yields, protect water quality

Autor: J Dillon, S Edinger-Marshall, J Letey

Publikováno v: California Agriculture, Vol 53, Iss 1 (1999)

During January and February 1997, farmers in 42 California counties were surveyed about irrigation and nutrient management techniques for individual crops during the 1986 and 1996 growing years. More than 800 responses were analyzed to identify trend

Externí odkaz: https://doaj.org/article/a709f8f1343b4130861f56a60085f261

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Akademický článek

Irrigation shifts toward sprinklers, drip and microsprinklers

Autor: S Edinger-Marshall, J Letey

Publikováno v: California Agriculture, Vol 51, Iss 3 (1997)

From 1972 to 1995, gravity irrigation (flood, furrow and so on) has decreased by about 20% on an acreage basis, while sprinkler irrigation has increased by about 8% and microirrigation, including drip and microsprinklers, has increased by about 12%.

Externí odkaz: https://doaj.org/article/bc90012624a74550ab7abff220e77831

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Akademický článek

Polymers check furrow erosion, help river life

Autor: H McCutchan, P Osterli, J Letey

Publikováno v: California Agriculture, Vol 47, Iss 5 (1993)

Each year, irrigation runoff from West Stanislaus County farmland carries about 1.2 million tons of sediment into the San Joaquin River. The sediment contains pesticide residues which threaten aquatic wildlife. One solution for this problem is to inj

Externí odkaz: https://doaj.org/article/ac0e919c30f940208484a9fe91ff896b

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Akademický článek

A greenhouse experiment finds water-sorbing polymers do not conserve water

Autor: J Letey, P Clark, C Amrhein

Publikováno v: California Agriculture, Vol 46, Iss 3 (1992)

To assess claims that water-sorbing polymers promote water conservation, a greenhouse experiment with container-grown marigolds was conducted to determine the effect of adding the polymers to soil mix. Plant growth and water retention in I- and 3-qua

Externí odkaz: https://doaj.org/article/809a75b453424492a2618cb207995ba6

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