No one in agriculture has been surprised pesticides have been detected in sloughs, creeks and rivers of the San Joaquin Valley since water sampling began a little more than two years ago.
What is somewhat surprising is how few hits have been recorded.
What is surprising and potentially explosive are the high levels of e. coli found at the 19 monitored as part of the Westside San Joaquin River Watershed Coalition.
This is a coalition of water and irrigation districts covering 450,000 acres of farmland stretching from Mendota, Calif., in the south to Tracy, Calif., in the north. It is one of several coalitions formed statewide to monitor and mitigate possible ag water pollution.
The findings from two years of testing were detailed at a meeting recently at Locke Ranch in Mendota, Calif., where management practices were outlined to keep farm inputs out of farm drainage and irrigation runoff.
As onerous and unwelcome as this water testing has been on agriculture, it has also been revealing. Agriculture is not as bad an actor as some environmental activists thought.
Agriculture representatives are frankly, surprised at how few hits have been found. However, Parry Klassen, executive director of Coalition for Urban/Rural Environmental Stewardship (CURES), does not expect fewer pesticide finds to deter the environmental activists.
This was the reason behind the work of CURES and others in developing best management practices (BMP) that would mitigate any pesticides getting into waterways.
BMPs such as:
· Lower pesticide rates
· Proper mixing and loading of pesticide sprayers
· Proper equipment calibration
· Adopting new spraying technology
· Creating buffer zones around sensitive areas
· Grassed drainage waterways
· Vegetative filter strips
· Drainage management
It is all about being proactive in dealing with the most onerous environmental regulations in the most productive agriculture state in the nation, said Roger Isom, vice president of California Cotton Ginners and Growers Associations.
“It is all about finding solutions that save money and address environmental solutions,” he said.
The Locke family of Mendota, Calif., has spent 75 years creating solutions to stay in business on a 1,500-acre farm bordered by some of the most important waterways in the state, the San Joaquin River, the Delta-Mendota Canal and the Mendota Pool which also takes water from the Kings River.
It is like farming under an aquatic microscope, but there are significant benefits to farming adjacent to a river, according to Gary Martin, a family partner in the Locke Ranch.
“There are a lot of good bugs around that river and that helps us spray less than maybe farmers on the West Side of the San Joaquin Valley,” he said.
The Locke farm is 1,500 acres irrigated mostly by surface and well water. Crops include cotton, alfalfa and new almond orchards irrigated with micro sprinklers.
Row crops are flood irrigated with a variety of systems to collect and discharge irrigation tailwater either directly into the river or to evaporation ponds or to a canal drainage district.
Martin says the farm tries to re-circulate as much tailwater as practical to irrigate crops again with the same water.
The farm has been practicing minimum tillage for more than a decade to reduce soil movement off fields, leaving cotton beds in place for as long as five seasons before they need to be knocked down and the field cleaned up.
They use poultry manure on the beds. That, combined with decomposing crop residue, builds up organic matter. Soils are monitored for residual nutrients to reduce primarily, nitrogen inputs.
The Locke family also is involved in a sustainable cotton project where beneficial insects are released and harbored in in-field habitat.
“We try to do as much of our spraying as we can with ground rigs. We use hooded and banded sprayers; shut off nozzles when we turn at the end of a row,” Martin said.
“We do a lot of things other people do as well to protect the environment.”
“We are motivated by practical approaches that are responsible and make good economic sense. The Locke family has been here for 75 years, and we are here to stay,” Martin said.