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Michael A. Ortiz, Krystyna Hyrczyk, and Roberto G. Lopez

devastating for field-grown crops ( Kelly, 1991 ). Studies have been conducted to assess specialty cut flower cultivar performance in field production systems in the southeastern United States ( Starman et al., 1995 ). The productivity and profitability of

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Brian A. Kahn

This review summarizes studies involving intercropping for field production of peppers [Capsicum spp. (typically Capsicum annuum)]. Intercropping is particularly important in developing countries and where arable land is limited. Fruit crops, vegetables, forages, and other crops representing over 12 botanical families have been intercropped with peppers. System recommendations may be affected by whether one is attempting to grow another species as an intercrop in a pepper field or whether peppers are being used as an intercrop in a different primary crop. Other factors such as the timing of the intercrop planting, climatic conditions, and local economics all contribute to the potential success or failure of intercropping with peppers. Although broad recommendations cannot be made, the reviewed studies offer several examples of successful combinations of peppers with other crops.

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Bert Cregg*

Lilac (Syringa vulgaris L) seedlings are commonly grown in many seedling nurseries in Michigan. Typically seedlings are lifted in the fall and stored prior to shipment or stored by the customer. A major problem in field production of lilacs is that seedlings often retain their leaves late in the fall. If the leaves are not removed prior to storage or shipment, the seedlings will mold and deteriorate. Therefore, growers must spend additional labor to remove the leaves, often by hand. The goal of this research was to evaluate chemical alternatives to defoliate lilac seedlings in field nurseries. Two on-farm research trials were conducted in 2001 and 2003 in cooperation with a seedling grower in Saugatuck, MI. In Experiment 1, Florel (1/2 and ¼ dilution) and chelated copper (0.5% and 1% solution) were sprayed by and onto lilac in the seedling bed. Florel and chelated copper effectively reduced leaf area of lilac seedlings. Less than 20% of the initial leaf area remained on the 1% copper and ½ Florel-treated seedlings. The ½ Florel and 1% chelated copper completely defoliated 67% and 40% of the seedlings, respectively, whereas only 17% on the control seedlings lost all their leaves prior to lifting. Both levels of Florel and the 1% copper treatment reduced growth of seedlings after planting. In experiment 2, we applied chelated copper treatments at varying rates (0.25% and 0.5%) and times (1 application and 2 applications) using the cooperators' spray equipment. Repeated applications of chelated copper were more effective in reducing seedling leaf area than a single application at both concentrations tested.

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Suzette P. Galinato and Carol A. Miles

). The objectives of this study were to 1) compare the economic potential of growing lettuce and tomato in high tunnel and open-field production systems and 2) identify the main factors that affect the profitability of each crop within each production

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Dewayne L. Ingram

significant contributor to GHG emissions in the field production of red maple was fuel consumption by farm machinery and truck transport of the finished product. That report also estimated the impact of altering certain production system protocols to reduce

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Russell W. Wallace, Annette L. Wszelaki, Carol A. Miles, Jeremy S. Cowan, Jeffrey Martin, Jonathan Roozen, Babette Gundersen, and Debra A. Inglis

open-field production systems located under three contrasting regions within the United States where high tunnel lettuce production has until now been less common. Materials and methods The experimental field trials were conducted during late Winter and

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Roger Kjelgren

Supplemental watering of shade trees in field production nurseries is needed, even in summer-rainfall climates, to achieve maximum growth. Scheduling the timing and amount of supplemental watering makes more efficient use of financial and water resources while maintaining maximum growth. Methods of scheduling supplemental watering based on uniform canopy and rooting in production agriculture must be modified, however, for shade trees in a production setting. Nursery trees are non-uniform in canopy and rooting compared to an agricultural crop. Applying the water budget method can be effective with sprinkler systems if tree water loss and rooting depth can be properly estimated. A measure of reference evapotranspiration and a species-specific multiplier are typically used to estimate water loss. Since species diversity in a field nursery is quite high, however, estimates of both tree transpiration and rooting depth must necessarily be simplified assumptions less accurate than for a uniform agricultural crop. If supplemental water is to be applied with drip irrigation, estimates of tree transpiration and soil water depletion need to be converted to volume units with information on total tree leaf area.

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W. Garrett Owen, Alyssa Hilligoss, and Roberto G. Lopez

yielded 8 and 17 stems/m 2 , respectively ( Table 3 ). Stems harvested in the high tunnel were on average 9.5 cm (15%) longer than those in the field. Compared with field production, high tunnel production yielded 120% more stems per square meter, had 13

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Brian A. Kahn, Niels O. Maness, Donna R. Chrz, and Lynda K. Carrier

—applied to the soil surface at two depths (equivalent to 2.5 or 5 cm) and then incorporated ≈5 to 7 cm deep for effects on field production of multiple cultivars of red radishes. Details of the larger study, including compost analyses, have been published

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Robert L. Houtz, Douglas D. Archbold, and Malcolm Royer

A technique was developed for controlled micro-release of CO2 into the leaf canopy of strawberry and tomato plants under field production conditions; The leaf canopy atmosphere of tomato plants was enriched to 500 and 1200 ppm CO2 with release rates of 60 and 300 l/h·30 m of row respectively. After 60 days of enrichment for 6 h each day beginning at fruit set, the total shoot biomass and yield was increased 41% and 25 % respectively for the high CO2 release rate. Strawberry leaf canopies did not show increased CO levels with CO2 enrichment except under ventilated2 row-covers where the atmospheric CO2 level was increased to 1500 ppm CO2. Although the total biomass was increased 39% this did not translate into increased yields perhaps due to excessive temperatures under the row covers.