In lettuce production, winter cover crops can decrease soil nitrate, leaching potential. Jackson, L., Wyland, L., Klein, J., Smith, R., Chaney, P. D., & Koike, S. California Agriculture, 47(5):12–15, September, 1993.
In lettuce production, winter cover crops can decrease soil nitrate, leaching potential [link]Paper  abstract   bibtex   
The large amounts of soil nitrate that can accumulate in annual row crop production during the winter fallow period can leach during winter storms and spring irrigation. In Monterey County, 48% of the wells in the upper unconfined aquifer exceed the public health drinking water standard of 10 ppm of nitrate-N. Nonleguminous cover crops, planted during the winter fallow and incorporated in early spring using reduced tillage equipment to maintain intact beds, have been found to reduce nitrate leaching without disrupting cropping schedules.
@article{jackson_lettuce_1993,
	title = {In lettuce production, winter cover crops can decrease soil nitrate, leaching potential},
	volume = {47},
	issn = {0008-0845},
	url = {http://calag.ucanr.edu/Archive/?article=ca.v047n05p12},
	abstract = {The large amounts of soil nitrate that can accumulate in annual row crop production during the winter fallow period can leach during winter storms and spring irrigation. In Monterey County, 48\% of the wells in the upper unconfined aquifer exceed the public health drinking water standard of 10 ppm of nitrate-N. Nonleguminous cover crops, planted during the winter fallow and incorporated in early spring using reduced tillage equipment to maintain intact beds, have been found to reduce nitrate leaching without disrupting cropping schedules.},
	language = {English},
	number = {5},
	urldate = {2017-01-30TZ},
	journal = {California Agriculture},
	author = {Jackson, L. and Wyland, L. and Klein, J. and Smith, R. and Chaney, Ph D. and Koike, S.},
	month = sep,
	year = {1993},
	pages = {12--15}
}

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