AJPS  Vol.2 No.5 , November 2011
Dependence of Pumpkin Yield on Plant Density and Variety
Abstract: Pumpkins (Cucurbita spp.) are an important specialty vegetable. Field studies were conducted on three pumpkin cultivars characterized with different growth habits to determine the effects of plant population and genotypes on marketable yield. Increasing plant populations from 4780 to 9560 plant per hectare resulted in significantly greater fruit number and yield in both growing seasons and for all tested genotypes. Average fruit weight declined at the higher populations. The response of pumpkin genotypes to different planting densities was genotype (growth habit) dependent since the response was pronounced in large vine types compared to bush type. The phenotypic variation existed among pumpkin genotypes for yield seems to be under genetic control. Foliar application of potassium improved growth and yield of pumpkin plants although the non-significant effect. These results demonstrate that growers may increase pumpkin yield by increasing plant populations.
Cite this paper: nullK. El-Hamed and M. Elwan, "Dependence of Pumpkin Yield on Plant Density and Variety," American Journal of Plant Sciences, Vol. 2 No. 5, 2011, pp. 636-643. doi: 10.4236/ajps.2011.25075.

[1]   R. Holliday “Plant Population and Crop Yield,” Nature, Vol. 186, No. 4718, 1960, pp. 22-24. doi:10.1038/186022b0

[2]   J. K. A. Bleasdale and J. A. Nelder, “Plant Population and Crop Yield,” Nature, Vol. 186, 1960, pp. 342. doi:10.1038/188342a0

[3]   J. H. M. Thornley, “Crop Yield and Planting Density,” Annals of Botany, Vol. 52, No. 2, 1983, pp. 257-259.

[4]   M. M. Pant, “Dependence of Plant Yield on Density and Planting Pattern,” Annals of Botany, Vol. 44, No. 4, 1979, pp. 513-516.

[5]   B. B. Casper and R. B. Jackson, “Plant Competition Underground,” Annual Review of Ecology and Systematics, Vol. 28, 1997, pp. 545-570. doi:10.1146/annurev.ecolsys.28.1.545

[6]   J. K. A. Bleasdale, “Plant Growth and Crop Yield,” Annals of Applied Biology, Vol. 57, No. 2, 1966, pp. 173-182. doi:10.1111/j.1744-7348.1966.tb03812.x

[7]   R. W. Willey and S. B. Heath, “The Quantitive Relationships between Plant Population and Crop Yield,” Advances in Agronomy, Vol. 21, 1969, pp. 281-321. doi:10.1016/S0065-2113(08)60100-5

[8]   K. E. Cushman, D. H. Nagel, T. E. Horgan and P. D. Gerard, “Plant Population Affects Pumpkin Yield Components,” HortTechnology, Vol. 14, No. 3, 2004, pp. 326-331.

[9]   C. J. Swanton and S. F. Weise, “Integrated Weed Management in the Rational and Approach,” Weed Technology, Vol. 5, No. 3, 1991, pp. 657-663.

[10]   D. D. Buhler, “Challenges and Opportunities for Integrated Weed Management,” Weed Science, Vol. 50, No. 3, 2002, 273-280. doi:10.1614/0043-1745(2002)050[0273:AIAAOF]2.0.CO;2

[11]   J. R. Teasdale, “Influence of Narrow Row/High Population Corn (Zea Mays) on Weed Control and Light Transmittance,” Weed Technology, Vol. 9, No. 1, 1995, pp. 113-118.

[12]   M. R. Speight, “The Potential of Ecosystem Management for Pest Control. Agriculture,” Ecosystems and Environment, Vol. 10, 1983, pp. 183-199. doi:10.1016/0167-8809(83)90061-0

[13]   R. H. Walker and G. A. Buchanan, “Crop Manipulation in Integrated Weed Management Systems,” Weed Science, Vol. 30, 1981, pp. 17-24.

[14]   V. E. Rubatzky and M. Yamaguchi, “World Vegetables Principles, Production and Nutritive Values,” 2nd Edition, Aspen Publishers, Inc., Maryland, 1999.

[15]   M. Murkovic, U. Mülleder and H. Nevnteuft, “Carotenoid Content in Different Varieties of Pumpkin,” Journal of Food Composition and Analysis, Vol. 15, No. 6, 2002, pp. 633-638. doi:10.1006/jfca.2002.1052

[16]   T. Hidaka and T. A. Nakatsu, “The Composition and Vitamin a Value of the Carotenoids of Pumpkins of Different Colors,” Journal of Food Biochemistry, Vol. 11, 1987, pp. 59-68. doi:10.1111/j.1745-4514.1987.tb00112.x

[17]   Y. I. Kwon, E. Apostolidis, Y. C. Kim and K. Shetty, “Health Benefits of Traditional Corn, Beans and Pumpkin: In Vitro Studies for Hyperglycemia and Hypertension Management,” Journal of Medicinal Food, Vol. 10, No. 2, 2007, pp. 266-275. doi:10.1089/jmf.2006.234

[18]   I. M. Dweikat and S. R. Kostewicz, “Row Arrangement, Plant Spacing, and Nitrogen Rate Effects on Zucchini Squash Yield,” HortScience, Vol. 24, No. 1, 1989, pp. 86-88.

[19]   C. A. Powell, P. J. Stoffella and H. S. Paris, “Plant Population Influence on Squash Yield, Sweet Potato Whitefly, Squash Silverleaf, and Zucchini Yellow Mosaic,” Hort- Science, Vol. 28, No. 8, 1993, pp. 796-798.

[20]   M. Edelstein and H. Nerson, “Genotype and Plant Density Affect Watermelon Grown for Seed Consumption,” Hort-Science, Vol. 37, No. 6, 2002, pp. 981-983.

[21]   C. E. Motsenbocker and R. A. Arancibia, “In-Row Spacing Influences Triploid Watermelon Yield and Crop Value,” HortTechnology, Vol. 12, No. 3, 2002, pp. 437-440.

[22]   D. S. NeSmith, “Plant Spacing Influences Watermelon Yield and Yield Components,” HortScience, Vol. 28, No. 9, 1993, pp. 885-887.

[23]   D. C. Sanders, J. D. Cure and J. R. Schultheis, “Yield Response of Watermelon to Planting Density, Planting Pattern, and Polyethylene Mulch,” HortScience, Vol. 34, No. 7, 1999, pp. 1221-1223.

[24]   D. Ban, S. Goreta and J. Borosic, “Plant Spacing and Cultivar Affect Melon Growth and Yield Components,” Scientia Horticulturae, Vol. 109, No. 3, 2006, pp. 238- 243. doi:10.1016/j.scienta.2006.04.015

[25]   D. E. Knavel, “Productivity and Growth of Short-Inter- node Muskmelon Plants at Various Spacing or Densities,” Journal of the American Society for Horticultural Science, Vol. 116, No. 6, 1991, pp. 926-929.

[26]   F. Kultur, H. G. Harrison and J. E. Staub, “Spacing and Genotype Affect Fruit Sugar Concentration, Yield, and Fruit Size of Muskmelon,” HortScience, Vol. 36, No. 3, 2001, pp. 274-278.

[27]   E. T. Maynard and W. D. Scott, “Plant Spacing Affects Yield of ‘Superstar’ Muskmelon,” HortScience, Vol. 33, No. 1, 1998, pp. 52-54.

[28]   S. Mendlinger, “Effect of Increasing Plant Density and Salinity on Yield and Fruit Quality in Muskmelon,” Scientia Horticulturae, Vol. 57, No. 1-2, 1994, pp. 41-49. doi:10.1016/0304-4238(94)90033-7

[29]   J. C. Roderiguez, N. L. Shaw and D. J. Cantliffe, “Influence of Plant Density on Yield and Fruit Quality of Greenhouse-Grown Galia Muskmelons,” HortTechnology, Vol. 1, No. 4, 2007, pp. 580-585.

[30]   N. Gebologlu and N. Saglam, “The Effect of Different Plant Spacing and Mulching Materials on the Yield and Fruit Quality of Pickling Cucumber,” Acta Horticulturae, Vol. 579, 2002, pp. 603-607.

[31]   J. E. Staub, L. D. Knerr and H. J. Hopen, “Plant Density and Herbicides Affect Cucumber Productivity,” Journal of the American Society for Horticultural Science, Vol. 117, No. 1, 1992, pp. 48-53.

[32]   I. E. Widders and H. C. Price, “Effects of Plant Density on Growth and Biomass Partitioning in Pickling Cucumbers,” Journal of the American Society for Horticultural Science, Vol. 114, No. 5, 1989, pp. 751-755.

[33]   J. O’Sullivan, “Irrigation, Spacing and Nitrogen Effects on Yield and Quality of Pickling Cucumber Grown for Mechanical Harvesting,” Canadian Journal of Plant Science, Vol. 60, No. 3, 1980, pp. 923-928. doi:10.4141/cjps80-135

[34]   Z. Gur and L. Garte, “Influence of the Plant Density and Sowing Date on the Yield of Pickling Cucumbers,” Acta Horticulturae, Vol. 52, 1975, pp. 169-176.

[35]   C. S. Tan, J. M. Fulton and V. W. Nuttal, “The Influence of Soil Moisture Stress and Plant Populations on the Yield of Pickling Cucumbers,” Scientia Horticulturae, Vol. 21, No. 3, 1983, pp. 217-224. doi:10.1016/0304-4238(83)90094-8

[36]   S. Reiners and D. I. M. Riggs, “Plant Spacing and Variety Affect Pumpkin Yield and Fruit Size, but Supplemental Nitrogen Does Not,” HortScience, Vol. 32, No. 6, 1997, pp. 1037-1039.

[37]   S. Reiners and D. I. M. Riggs, “Plant Population Affects Yield and Fruit Size of Pumpkin,” HortScience, Vol. 34, No. 6, 1999, pp. 1076-1078.

[38]   R. J. Dufault and A. Korkmaz, “Influence of Plant Spacing on Connecticult Field Pumpkin Size Density and Yield,” In: J. D. McCreight, Ed., Evaluation and Enhancement of Cucurbit Germplasm, American Society for Horticultural Science Press, New York, 1998, pp. 51-52.

[39]   C. D. Schlichting, “The Evolution of Phenotypic Plasticity in Plants,” Annual Review of Ecology and Systematics, Vol. 17, 1986, pp. 667-693. doi:10.1146/

[40]   V. Romheld and E. Kirkby, “Research on Potassium in Agriculture: Needs and Prospects,” Plant Soil, Vol. 335, No. 1-2, 2010, pp. 155-180. doi:10.1007/s11104-010-0520-1

[41]   H. Marschner, “Mineral Nutrition of Higher Plants,” 2nd Edition, Academic Press, London, 1995.

[42]   A. Amtmann, S. Troufflard and P. Armengaud, “The Effect of Potassium Nutrition on Pest and Disease Resistance in Plants,” Physiologia Plantarum, Vol. 133, No. 4, 2008, pp. 682-691. doi:10.1111/j.1399-3054.2008.01075.x

[43]   Statsoft Inc. “STATISTICA für Windows [Software- system für Datenanalyse] Version 6,” 2001.

[44]   S. Reiners, “Stand Establishment, Spacing and Fertilization to Maximize Pumpkin Yield,” New England Vegetable and Fruit Conference, Manchester, 18 December 2003. 03/pumpkin_ scholl1/stand_ establishment_ spacing_ fertilization_ maximize_ pumkin_y.pdf.

[45]   K. E. Cushman, T. E. Horgan, D. H. Nagel, M. Maqbool and P. D. Gerard, “The Effect of Plant Population on Pumpkin Yield,” Annual Report of the North Mississippi Reseach and Extension Center, Mississippi Agricultural and Forestry Experiment Station Information Bulletin, Vol. 375, 2001, pp. 296-297.

[46]   K. E. Cushman, T. E. Horgan, D. H. Nagel and P. D. Gerard, “Planting Density Affects Pumpkin Size and Weigh but Not Yield,” Annual Report of the North Mississippi Reseach and Extension Center, Mississippi Agricultural and Forestry Experiment Station Information Bulletin, Vol. 386, 2002, pp. 282-283.

[47]   S. Perrenoud, “Potassium and Plant Health,” IPI-Re- search Topics No. 3, 2nd Edition, International Potash Institute, Basel, 1990, p. 365.

[48]   C. Hermans, J. R. Hammond, P. J. White and N. Verbruggen, “How do Plants Respond to Nutrient Shortage by Biomass Allocation?” Trends in Plant Science, Vol. 1, 2006, pp. 610-617. doi:10.1016/j.tplants.2006.10.007

[49]   R. Karkleliene, P. Viskelis and M. Rubinskiene, “Growing, Yielding and Quality of Different Ecologically Grown Pumpkin Cultivars,” Sodininkyste Ir Darzininkyste, Vol. 27, No. 2, 2008, pp. 401-409.

[50]   B. K. Mohanty and R. S. Mishra, “Variation and Genetic Parameters of Yield and Its Components in Pumpkin,” Indian Journal of Horticulture, Vol. 56, No. 4, 1999, pp. 337-342.

[51]   B. K. Mohanty, “Combining Ability for Yield and Its Components in Pumpkin,” Indian Journal of Genetics and Plant Breeding, Vol. 60, No. 3, 2000, pp. 33-379.