Abstract
Two reciprocal polynomial models were used to quantify yield/stem density relationships in the Russet Burbank cultivar y−θ = α + βϱ and y−1 = β0 + β1ϱ + β2ϱ2 where y = yield per plant; ϱ = stems m−2 and β0, β1, β2 and α, β, and θ are fitted parameters. The use of a systematic design allowed characterisation of the yield/density response surface over a wide range of densities (1.8 to 20.0 plants m−2) without involving experiments of impractical size. The effect of both seed size (30, 40, 50, 60 gm) and type (cut or whole) on the relationship was studied.
Both models provided excellent statistical fits for marketable yield data, while the former model gave a similar fit for total yield data. The form of the relationship was not influenced either by seed size or type. Total yield was asymptotically related to stem density while marketable yield was parabolically related.
Resumen
Se usaron dos modelos polinomiales para cuantificar la relación rendimiento/densidad de tallos en el cultivar Russet Burbank:y − θ =αa + βϱ y y−1 = β0 + β1ϱ + β2ϱ2 dondey = rendimiento por planta, ϱ = tallos m−2 y β0, β1, β2, α, β y θ son parámetros ajustados.
El uso de un diseno sistemático permitió la caracterización de la superficie de respuesta de la relación rendimiento/densidad sobre un rango amplio de densidades (1.8 a 20.0 plantas por m−2) sin involucrar experimentos de tamaño inpráctico. También se estudió el efecto del tamaño de la semilla (30, 40, 50, 60 gm) y el tipo (cortada o entera) en la relació.
Ambos modelos dieron en excelente ajuste estadístico para los datos de rendimiento comercializable mientras qe el primer modelo dió un ajuste similar para los datos de rendimiento total. La forma de la relación no fué influenciada por el tipo o tamaño de la semilla. El rendimiento total fue relacionado asintóticamente a la densidad de tallos mientras que el rendimiento comercializable fue relacionado parabólicamente.
Similar content being viewed by others
Literature Cited
Allen, E.J. and D.C.E. Wurr. 1973. A comparison of two methods of recording stem densities in the potato crop. Potato Res 16: 10–9.
Berry, G. 1967. A mathematical model relating plant yield with arrangement for regularly spaced crops. Biometrics 23: 505–15.
Bleasdale, J.K.A. 1965. Relationships between set characters and yield in maincrop potatoes. J Agric Sci 64: 361–66.
Bleasdale, J.K.A. 1968. Plant growth and crop yield. Ann Appl Biol 57: 173–82.
Bleasdale, J.K.A. 1969. Plant spacing. Aust Veg Res Conf.
Bleasdale, J.K.A. and J.A. Neider. 1960. Plant population and crop yield. Nature (Lond) 188: 342.
Bleasdale, J.K.A. and R. Thompson. 1966. The effects of plant density and the pattern of plant arrangement on the yield of parsnips. J Hortic Sci 41: 371–8.
Bodlaender, K.B.A. and S. Albra. 1966. Influence of the growth retardant B 995 on growth and yield of potatoes. Eur Potato J 9: 242–58.
Duncan, W.G. 1958. The relationship between corn population and yield. Agron J 50: 82–4.
Farazadaghi, H. and P.M. Harris. 1968. Plant competition and crop yield. Nature (Lond) 217: 289–90.
Fery, R.L. and J. Janick. 1971. Effect of time of harvest on the response of the tomato to population pressure. J Am Soc Hortic Sci 96: 172–6.
Hartley, H.O. 1961. The modified Gauss-Newton method for fitting of non-linear regression functions by least squares. Technometrics 3: 269–80.
Holliday, R. 1960. Plant population and crop yield. Nature, (Lond) 186: 22–4.
Holliday, R. 1960. Plant population and crop yield: Part I. Field Crop Abstr 13: 159–67.
Iritani, W.M., R. Thornton, L. Miller and G. O’Leary. 1972. Relationships of seed size, spacing, stem numbers to yield of Russet Burbank potatoes. Am Potato J 49: 463–9.
Jones, L.H. 1967. Factors affecting the productivity of Dwarf French Beans. Agric Prog 42: 42–52.
Kunkel, R. and N. Holstad. 1968. Effect of adding humates to the fertilizer on the yield and quality of Russet Burbank potatoes. Am Potato J 45: 449–57.
Lang, A.L., J. W. Pendleton and G.H. Dungan. 1956. Influence of population and nitrogen levels on yield and protein and oil content of nine corn hybrids. Agron J 48: 284–9.
Lynch, D.R. and R.G. Rowberry. 1976. Population density studies with Russet Burbank. II Effect of fertilization and spacing on growth, development and yield. Am Potato J (In Press).
Mead, R. 1970. Plant density and crop yield. Appl Stat 19: 64–81.
Mitscherlich, E.A. 1919. Landwirtsch Jahrb 53: 341–60.
Neider, J.A. 1962. New kinds of systematic designs for spacing experiments. Biometrics 18: 283–307.
Nichols, M. A. 1967. A note on a plant density and fertilizer experiment with onions in New Zealand. Hort Res 7: 144–7.
Rowberry, R.G. and G.R. Johnston. 1966. Effect of seed maturity, size and spacing on the yield of potatoes in Ontario. Am Pot J 43: 332–9.
Sale, P.J.M. 1973. Productivity of vegetable crops in a region of high solar input. Aust J Agric Res 24: 733–62.
Sharpe, P.R. and J.B. Dent. 1968. The determination and economic analysis of relationships between plant population and yield of main crop potatoes. J Agric Sci 70: 123–9.
Shinozaki, N. and T. Kira. 1956. Intra-specific competition among higher plants. J Inst Polytech Osaka City University D 7: 35–72.
Warne, L.C.G. 1951. Spacing experiments on vegetables. J Hortic Sci 26: 84–97.
Warren, J.A. 1963. Use of empirical equations to describe the effects of plant density on the yield of corn and the application of such equations to variety evaluation. Crop Sci 3: 197–201.
Willey, R.W. and S.B. Heath. 1969. The quantitative relationships between plant population and crop yield. Adv Agron 21: 281–321.
Wit, C.T. de and G.C. Ennik. 1958. On competition. Jaarbk Biol Scheik Ondery Landboug Mede 50: 59–73.
Author information
Authors and Affiliations
Additional information
Part of a Ph.D. thesis submitted by the senior author.
Rights and permissions
About this article
Cite this article
Lynch, D.R., Rowberry, R.G. Population density studies with Russet Burbank I. Yield/stem density models. American Potato Journal 54, 43–56 (1977). https://doi.org/10.1007/BF02851873
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02851873