Plant Density Effects on Single-head Broccoli Production

Jett, Lewis W.; Morse, Ronald D.; O’Dell, C. R.

doi:10.21273/hortsci.30.1.50

Cited by 13 publications

(18 citation statements)

References 8 publications

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“…Most vegetable crops are grown in rows with set distances between the individual plants, so altering the planting distance within or between the rows can affect the growth of the individual plant considerably (Csizinszky 1996;Falzari et al 2006;Ferrari et al 2008;Jett et al 1995). The main reason for lowering plant density is to increase the supply of nutrients, water and radiation to the individual plants (Francescangeli et al 2006;Hussaini et al 2000).…”

Section: Discussionmentioning

confidence: 99%

“…canning, processing, frozen foods) the crops are mostly grown at higher spacing to achieve large units, while for direct or whole sale market channels smaller units are desired so tighter spacing is used (e.g. Jett et al 1995). How this can be implemented in the context of a crop growth simulation model was shown with white cabbage as an example (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Converting simulated total dry matter to fresh marketable yield for field vegetables at a range of nitrogen supply levels

et al. 2009

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Converting simulated total dry matter to fresh marketable yield for field vegetables at a range of nitrogen supply levels

et al. 2009

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“…Fresh weight harvest index (FWHI) (Chung 1982;Shelp 1988;Jett et al 1995) was defined as: Fresh and dry weights of tops were defined as the total plant (sum of head and vegetation) fresh and dry weights, respectively. Although both fresh and dry weights were measured, only detailed fresh weight data are presented herein, since broccoli is a fresh product and both fresh and dry weights showed similar responses.…”

Section: Data Collectionmentioning

confidence: 99%

Broccoli yield and quality can be determined by cultivar and temperature but not photoperiod in south-east Queensland

Tan¹,

Wearing²,

Rickert³

et al. 1999

Aust. J. Exp. Agric.

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Summary. Understanding of genotype and environment interactions will help farmers optimise broccoli (Brassica oleracea L. var. italica Plenck) yield and quality, by matching cultivars to time of sowing. Limited information is available on the effect of temperature and photoperiod on broccoli yield and quality. The objective of this study was to quantify the temperature and photoperiod responses of yield and quality attributes in a subtropical environment. Three cultivars (‘Fiesta’, ‘Greenbelt’ and ‘Marathon’) were sown on 8 dates from 11 March to 22 May 1997. Plants were grown under natural and extended (16 h) photoperiods at Gatton College, south-east Queensland, under non-limiting conditions of water and nutrient supply. Climatic data, dates of emergence, floral initiation, harvest maturity, and yield and quality data were recorded. As growing season mean minimum temperature decreased, fresh weight of tops decreased linearly while fresh weight harvest index increased linearly. However, there was no definite relationship between fresh weight of tops or fresh weight harvest index, and growing season mean minimum temperatures ≥10ºC. Quality attributes were determined more by genotype than environment. ‘Fiesta’ had the best quality, with higher head shape and branching angle ratings than Greenbelt and Marathon. Bud colour and cluster separation ratings of Marathon were only suited for export when growing season mean minimum temperatures were <8ºC. Photoperiod did not influence yield and quality in this study.

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“…Due to seasonal production schedules, the use of transplants is recommended for uniform stand establishment (Elson et al, 1992;Sterrett et al, 1991). Furthermore, transplants allow for the production of large single-heads (>6 inches diameter) preferred by consumers (Jett et al, 1995;Relf et al, 1990). As a result, growers supply a high-value fall product and use plastic and residual N fertilizer from summer production.…”

mentioning

confidence: 99%

“…Furthermore, plant density impacts the quantity of marketable head and broccoli head-size (Chung, 1985;Jett et al, 1995). We conducted a 3-year study to identify practices that maximize large, single-head broccoli production.…”

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confidence: 99%

Large Single-head Broccoli Yield as Affected by Plant Density, Nitrogen, and Cultivar in a Plasticulture System

Schellenberg

Bratsch

Shen

2009

hortte

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An open-market window has been identified in Virginia for fall broccoli (Brassica oleracea var. italica). Vegetable producers using plasticulture systems can capitalize on this opportunity by growing broccoli as a second crop after summer vegetables. The objective of this project was to evaluate suitability of two broccoli cultivars, Everest and Gypsy, for the fall production of large single-heads (>6 inches in diameter) for the fresh market. Planting density and rate of nitrogen (N) fertilizer (25, 60, and 100 lb/acre N) effects on yield characteristics were evaluated in a plasticulture system during a 3-year study (2003–05) conducted with broccoli transplants at the Virginia Polytechnic Institute and State University Kentland Agricultural Research Farm near Blacksburg, VA. The percentage of large heads was cultivar, plant density, and N rate dependent. The midseason ‘Gypsy’ produced significantly higher total yield and head weight compared with the early-season ‘Everest’. The optimum density to maximize floret production per area was 12,500 plants/acre and a supplemental N rate of 100 lb/acre. This N rate significantly (P < 0.002) improved marketable yield, large head yield, and leaf N accumulation compared with the lower rates. The data indicate that the feasibility of growing fall broccoli using a plasticulture system depends on the number of large heads produced for the fresh market. This in turn will depend on the choice of cultivar, stand establishment, and the requirement for supplemental N fertilizer over the residual level available in the soil after the first crop.

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Plant Density Effects on Single-head Broccoli Production

Cited by 13 publications

References 8 publications

Converting simulated total dry matter to fresh marketable yield for field vegetables at a range of nitrogen supply levels

Converting simulated total dry matter to fresh marketable yield for field vegetables at a range of nitrogen supply levels

Broccoli yield and quality can be determined by cultivar and temperature but not photoperiod in south-east Queensland

Large Single-head Broccoli Yield as Affected by Plant Density, Nitrogen, and Cultivar in a Plasticulture System

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