Crop Nutrient Tool. NRCS (USDA National Resources Conservation Service)
Crop Nutrient Tool [link]Paper  bibtex   
@misc{nrcs_usda_national_resources_conservation_service_crop_nodate,
	title = {Crop {Nutrient} {Tool}},
	url = {http://plants.usda.gov/npk/main},
	urldate = {2012-07-01},
	author = {{NRCS (USDA National Resources Conservation Service)}}
}
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