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Hawaii Water Quality Extension Program
nps 319 | oahu watersheds | waialua | project 96-440
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Natural Resources Extension

Project Name: Reducing Nonpoint Source Pollution from Sediments and Herbicides in Orchards in the Kaiaka–Waialua HUA
ASO Log No.: 96-440
Start/End Date: January 1996 to April 1997
Federal Funds: $23,160.00
Matching Funds: $16,500.00
Contractor: Carl Evensen
University of Hawaii – CTAHR
Department of Natural Resources and Environ. Management
1910 East-West Road, Sherman Lab
Honolulu, HI 96822
Phone: (808) 956-8825
As the former Waialua Sugar Company began a transition from sugarcane production to alternative agricultural uses, an opportunity arose to encourage the implementation of agricultural practices that protect the environment at the onset of these ventures. Agricultural land has the potential to contribute sediment, nutrient/fertilizers, toxins. pathogens, pH and fresh water flow into the ocean. Data from representative agricultural locations in Hawaii have revealed that sediment movements is the mahor nonpoint source pollution problem.
Objectives/Goals: Demonstrate the use of cover crops in orchard crops for erosion control and weed suppression; advise Dole Food Company on modifying cover crop planting equipment so that it performs with precision planting in inter-rows of coffee orchards; determine the reduction in herbicide applications and estimated reductions in soil loss associated with orchards in the Kaiaka – Waialua HUA; and provide opportunities for transferring this technology to other orchard growers in the state by making presentations at conferences, holding field days, and by preparing extension publications.
Methods Employed: Plant lychee and coffee demonstration sites with six grass species. Conduct crop and weed rating and monitor data.
Pollutants of Concern: Sediment, herbicides
Watershed: Waialua, Kiikii, Poamoho, Kaukonahua, Paukaulia, Opaeula, Helemano, Anahulu, Kawailoa, Kawaiiki, Loko Ea and Keamanea Watersheds, island of Oahu
Size of Project: 110 acres, along Kamehameha Highway between Wahiawa and Waialua
Affected Water Bodies: Kaiaka and Waialua Bays
Deliverables: Final Report
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Cooperative Extension Service programs, conducted in cooperation with the U. S. Department of Agriculture, are provided to the people of Hawaii without regard to race, sex, age, religion, color, national origin, ancestry, disability, marital status, arrest and court record, sexual orientation, or veteran status. The University is an equal opportunity / affirmative action institution.