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Two systems of relay-intercropping muskmelons (Cucumis melo L.) with Scotch pine (Pinus sylvestris L.) Christmas trees using black plastic mulch and drip irrigation were evaluated for their potential to improve cash return. Returns ranged from a high of $26,200/ha for plastic mulch-drip irrigation and a selling price of $l.00/melon to a low of $6900/ha for bare ground-drip irrigation and a selling price of $0.40/melon. The benefit- cost index ranged from 24 to 3.4, depending on the system evaluated. Pine growth apparently was impeded by plastic mulch; however, increased yields of melons grown under plastic mulch may offset the slight decrease in pine growth. Christmas tree production is a common enterprise in many parts of the United States, especially in the northeastern and Great Lakes regions (Chapman and Wray, 1979; Dickson and Winch, 1976). Consumers generally pre- fer to purchase locally grown trees (Hildebrandt et al., 1989). In many instances, Christmas tree production is relegated to marginal land, and few additional inputs are used. It may take 6 to IO years to produce a marketable 1.8- to 2.4- m-tall Scotch pine Christmas tree (Behlen, 1978; Davenport and Walters, 1970). Produc- ers receive no cash return from their invest- ments during this time. Cut-your-own Christmas trees may be a component of a large retail horticultural op- eration, especially near urban or suburban populationcenters. Producing such along-term crop on high-value land requires a steady cash flow to ensure a profitable operation. The purpose of this study was to determine if an intensive crop production system using plastic mulches, drip irrigation, and relay-intercropped

Relay-Intercropping Muskmelons with Scotch Pine Christmas Trees Using Plastic Mulch and Drip Irrigation