Project objectives from proposal:
This project will evaluate the effectiveness of controlling weeds in organic asparagus with the use of chickens and a cover crop barrier. Organic asparagus is a high-value crop that grows well in the Northeast, but weed control is a significant challenge, particularly because asparagus is a perennial crop. We propose to evaluate a two-pronged approach: first, after the asparagus harvest season is over, we will allow laying hens to range freely in the asparagus patch by using a “chicken tractor” (a portable chicken pen) and a moveable fence. Our experience with this technique on a small scale leads us to believe that the chickens will do a good job of controlling both grasses and broadleaf weeds. The second experimental technique is to establish a “weed barrier”, a tilled buffer zone 10 feet wide around the perimeter of the asparagus patch. This buffer zone will be planted to a cover crop (oats or winter rye) every fall to help keep perennial weeds (such as quack grass, Agropyron repens) from working their way into the asparagus from the surrounding sod.
We will gather data on weed intensity and on the growth and yield of the asparagus, in the experimental planting and a control planting. We will also compare the use of two types of organic mulch (straw and waste hay), determine guidelines for the recommended number of chickens per acre, compare insect pressure between the two plots, and evaluate different methods for incorporating the winter rye cover crop in the spring.
We will share our results with other farmers through an article in the Maine Organic Farmer & Gardener and by giving talks at the Maine Department of Agriculture Trade Show and at an event sponsored by the UNH Cooperative Extension Service.