Weed Management

Evaluating the Effects of Seeding and Inoculant Rates on Weed Suppression, Nodulation, and Soil Health on Organic Lentil Production in the Northern Great Plains

Lentils are important for diversifying wheat-based cropping systems and are also beneficial in enhancing soil health. These benefits have contributed to the exponential growth in pulse crop acreage in The Northern Great Plains (NGP). There are several challenges facing organic lentil production. Lack of approved herbicide for use in organic pulse crop production provides a challenge to weed management.

Evaluating Benefits of Winter Annual Cover Crop Systems for Organic Sweet Potato in North Carolina

North Carolina is the second largest producer of organic sweet potatoes in the U.S., with a rapid 42% increase in acreage transitioning to organic from 2014 to 2016. Despite a steady demand for organic sweet potatoes, marketable yield often does not reach the yield potential for this region due to challenges in weed, insect and soil fertility management. Through farmer consultation soil borne pests such a wireworm and weed proliferation were identified as two areas of concern for organic farmers in North Carolina.

 

Developing a Cover Crop-Based, No-Till System for Small-Scale Vegetable Producers: Effects on Soil Health, Weeds, Arthropod Communities, and Yield

In the Midwest, one limitation faced by small- and mid-scale organic producers involving cover crop-based, no-till systems is the expense associated with equipment such as a roller crimper needed to terminate the cover crop for spring planting. Thus, the development of an effective no-till system that does not require the use of expensive equipment would be beneficial to producers.

Creating Climate Resilient Organic Systems by Enhancing Arbuscular Mycorrhizal Fungi Associations

While the majority of carrots are cultivated in California, recent droughts and water use restrictions may impact the success of future crops. Even in states such as Wisconsin, where water is more abundant, crops still must overcome oscillating soil moisture regimes due to differences in soil drainage, water-holding capacity, and microclimate conditions, as well as the anticipated drier summers which are predicted to increase with climate change.

Field Evaluation of Designed Compost Extracts for Organic Weed Suppression

Organic vegetable growers need practical and cost-effective technology to reduce weed pressure and yield losses. In 2013-2014, OFRF funded Dr. Gladis Zinati at the Rodale Institute to perform laboratory and greenhouse trials on the weed suppressing ability of chemically- and biologically-designed compost extracts (DCE). Dr. Zinati found that DCEs with lower nitrate levels and greater nematode-to-protozoa ratios significantly reduced lambsquarter weed seed germination by 32% without affecting crop seed percent germination.

Development of weed control methods and irrigation requirements for organic medicinal herb production in New Mexico, 2003-2004

 Small-scale and family-oriented organic growers must be continually innovative and efficient in their operations in order to remain in business. One strategy for small and organic farmers is development of niche markets and specialty or high-value alternative crops, such as medicinal herbs. The American Southwest has a large number of native medicinal herb species that have been used traditionally by indigenous and Hispanic cultures. By and large, these species have been wild-harvested from native stands, mostly for personal, family, or local use.

Effects of organic alternatives for weed control and ground cover management on tree fruit growth, development and productivity

Organic fruit production in the US, especially the western regions, is expanding. The increase is occurring for both economic and ecological reasons. Current market conditions dictate that organic apple growers produce large, flavorful, high quality fruit. Large, high quality fruit receive price premiums and market acceptance whereas small fruit can be difficult to sell, even at lower prices. To grow large fruit, trees must be unstressed and provided with adequate water and nutrition. Weeds can compete with fruit trees for both water and nutrients.

Targeted Mowing to Increase Allelopathy of Rye Cover Crop in a Tomato Production System

This project examined whether targeted mowing of winter rye cover crop (Secale cereale L.) would increase its weed suppression ability by increasing levels of rye’s major allelochemicals, Hydroaxamic acids (Hx), and subsequently increase crop yield in an organic tomato production system. The project was conducted on organic farms in Upper Marlboro (2003), and Beltsville (2004), Maryland, using a rye cover crop that was grown as a monoculture and as a mixture with crimson clover, and black mulch. 

Evaluation of In-Row Weed Cultivators in Organic Soybeans and Corn

Objectives

1. To investigate the abilities of six in–row weeding implements to control in-row weeds in organic soybeans and corn. The initial selected six implements were reduced to five after preliminary trials showed that the Bezzerides Cultivator System with spyder set and spring hoe, was similar with the Bezzerides Cultivator System with spyder set and torsion weeders. This change was made with the agreement of the farmer. Also it was decided to use the Williams tool system as the tine weeder without the optional side knives offered.