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Squash (Cucurbita pepo L. var. melopepo) was grown at two locations with different soil types as a second crop in a succession cropping study that used previously cropped polyethylene-mulched beds. Squash was produced with drip or overhead irrigation and with concurrent N-K fertilization or residual fertilizer from the previous crop. Tissue mineral concentration responses to irrigation method were variable; in early fruit, N and K concentrations were higher with overhead than for drip, but leaf Ca and Mg concentrations were higher with drip than with overhead irrigation. Concentrations of N and K were higher with concurrent than with residual fertilization and increased with an increase in application rate. In contrast, concentrations of P, Ca, and Mg decreased with concurrent fertilization and an increase in application rate. Multiple crop vegetable production has received considerable attention in recent years (Albregts and Howard, 1985; Brown et al., 1985; Clough et al., 1990; Csizinszky et al., 1985). The practice has been shown to reduce costs and/or inputs by enabling succeeding crops to further use fumigants, polyethylene mulch, drip tape, and fertilizers applied to the first crop (Bryan and Dalton, 1974; Hayslip et al., 1978; Stall et al., 1978). Numerous reports have been published regarding the effects of fertilizer application and irrigation methods on crop yield and mineral accumulation in most important crop species (Bhella, 1988; Bhella and Wilcox, 1986; Bryan and Dalton, 1974; Locascio et al., 1989; Persaud et al., 1976). However, no information was found regarding the effects of these cultural practices on mineral element concentration and distribution in yellow squash when produced in a drip-irrigated, polyethylene-mulched sequential crop production system. This study was conducted to examine the effects of rate of residual and concurrent fertilizer application and irrigation methods for successive cropping on mineral accumulation of second-crop squash. Materials and Methods Yellow squash was produced as a component in a succession cropping study (Clough et al., 1990) conducted on a fine sand (loamy, siliceous hyperthermic, Grossarenic Palendult) at Gainesville, Fla., and on a loamy fine sand (fine-loamy, siliceous, thermic, Typic Palendult) at Quincy, Fla. Crops were produced with overhead sprinkler or drip irrigation and with concurrent application of N-K fertilizer at 135-202 or 270-404 kg·ha, or with residual nutrients from the previous broccoli for publication 7 Oct 1991. Accepted for publication 27 Apr. 1992. gr. Expt. Sta. .I. Ser. no. R-02182. The cost of publishing this paper yed in part by the payment of page charges. Under postal regulations, r therefore must be hereby marked advertisement solely to indicate this address: Oregon State Univ., Hermiston Agricultural Research and n Center, Box 105, Hermiston, OR 97838. r. Soc. Hort. Sci. 117(5):725-729. 1992. crop that had been fertilized at the same rates. The design was a split-split plot replicated four times with location as main plots, irrigation method as sub-plots, and N-K rate and application time as sub-sub-plots. Data were examined using analysis of variance procedures (SAS Institute, 1985). In the spring, ‘Dixie’ yellow squash was direct-seeded 30 cm apart, 60 cm between rows, two rows per bed (36,000 plants/ ha) into the same holes used for the previous fall broccoli crop. Overhead-irrigated, concurrently fertilized plots received 100% of the treatment N-K as NH4NO 3 and KC1 applied by hand to the soil surface through holes 30 cm apart in the bed center at the time of crop establishment. Drip-irrigated plots received the same total amount of fertilizer apportioned in weekly increments injected through the irrigation system beginning 1 week after emergence and continuing for 10 weeks. Squash fruit were harvested every 2 to 3 days for 5 weeks, beginning 6 weeks after emergence. Six fruit per plot (fruit 1) and most recently matured leaves were sampled at the first harvest, while six fruit (fruit 2) and the aboveground portion of two plants per plot were collected at the final harvest for mineral analysis. Samples were prepared according to Lockman (1980) for K, Ca, and Mg by atomic absorption spectroscopy (Perkin Elmer Corporation, 1976), and P determination was done with a Technicon autoanalyzer (Technicon Industrial Systems, 1976) at the IFAS Extension Soil Testing Laboratory, Gainesville, Fla. (Rhue and Kidder, 1983). Tissue total N was determined by micro-Kjeldahl analysis (Gallaher et al., 1975). Irrigation was applied two to three times weekly to overheadirrigated plots in an amount equal to pan evaporation (ETpan) as measured with a U.S. Weather Bureau class A evaporation pan at each site. Drip irrigation was applied daily in an amount equal to 0.55 ETpan to the entire plot area based on the average ETpan for the previous 10 days (the mulched, raised bed area received water in an amount equal to ETpan). The quantity of water applied to each irrigation treatment was reduced to compensate for rainfall since the previous irrigation application. Recommended commercial production practices for insect and disease control were followed.

Mineral Concentration of Yellow Squash Responds to Irrigation Method and Fertilization Management