Evaluation of a Wide Range of Plant Density on Yield and Yield Components of Rapeseed (Brassica napus L.) Cultivars

Document Type : Scientific - Research

Authors

• Alireza koocheki ¹
• Mehdii Azizi ²
• ÙŽAli Noroozian ¹
• Samane Najibnia ¹

¹ Department of Agrotechnology, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran

² Khorasan Razavi Agricultural and Natural Resources Research Center

10.22067/jag.v12i1.40807

Abstract

Introduction
Canola (Brassica napus) is a major oilseed crop in the world, and its oil is used not only for salad and frying but also in the processing of margarines, shortenings, and other food products. Canola (Brassica napus L.) is often called a flexible or plastic crop because individual plants can adjust the number and size of branches and pods they produce in response to available moisture, light and nutrients. Therefore, canola naturally compensates for variations in plant population over relatively wide ranges with very little effect on final yield. At plant densities of 70-100 plants per square meter (approximately 7-10 plants per square foot), canola plants normally produce 3-5 secondary branches, in addition to the main stem. At low densities of 20-30 plants per m2, this plant can produce up to four times the number of branches that stands of 70-100 plants per m2 produce. Extension of canola cultivation varieties need effective instruments to follow up characters associated with yield and yield components. Therefore, determination of the response of canola cultivars to plant density is principally important and in general plant density is the most important factor which limit yield production on farmlands.
Materials and Methods
In order to determine the best planting density for rapeseed cultivars, this experiment was conducted at the agricultural research field of Ferdowsi University of Mashhad, in 2011. A factorial experiment based on RCBD with three replications was used. Factors were cultivars (Hayola401 and Modena) and planting density (40, 70, 100, 130, 160 and 190 plants.m-2). A composite sample of soil from the surface of the ground down to the depth of 30 cm was taken and sent to a laboratory for determining the physical and chemical features of the soil. Results of tests carried out on these samples showed that the available phosphorous, and the available potassium contents of the soil were 31.5 mg.kg-1 and 267 mg.kg-1, respectively. The soil pH was 7.3 with texture containing 40% clay, 41% silt, and 19% sand. Distance between plots was 0.5 meter and between replications 1 meter used as passage way. At crop maturity, five plants were randomly selected from each plot and the seed yield and yield components (including number of seeds per pod, number of pods per plant and the 1000-seed weight) were measured. Analysis of the variance was performed using the SAS statistical software, and comparison of the means was performed on the basis of duncan’s multiple range test at five percent probability level.
Results and Discussion
Results showed that there were significantly differences between plant density on rapeseed cultivars. Canola crops need 30-40 plants per m2 (approximately 3-4 plants per square foot) to maintain yield potential. Plant populations lower than this is more likely to have yield loss. The average grain yield in Modena cultivar was 13.5% higher than in Hayola401 cultivar. Number of pods per plant in Modena was significantly higher than in the Hayola401.When plant density decreased from 40 to 190 plants.m-2, plant height of rapeseed increased. The greatest number of seeds per pod, biological yield, harvest index and oil percentage were observed in 70 plants.m-2.
Conclusion
Rapeseed cultivars responded strongly to changes in plant density. The average grain yield in Modena cultivar was higher than in Hayola401 cultivar. The maximum seed yield was observed in 70 plants.m-2.
Acknowledgement
This research was funded by Vice Chancellor for Research of Ferdowsi University of Mashhad, which is hereby acknowledged.

Keywords

• Cultivar
• Planting density
• Oil
• Seed yield
• Harvest index

20.1001.1.20087713.1399.12.1.1.3

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References

Ahmad Zadeh, M., 2007. Genetic diversity in the various layers of rapeseed using morphological traits. M.Sc. Thesis, Faculty of Agricultural Sciences, University of Guilan, Iran. (In Persian with English Summary)

Ali, M.H., Zaman, S.M.H., and Hossain, S.M.A., 1996. Variation in yield, oil and protein content of rapeseed (Brassica campestris L.) in relation to levels of nitrogen, sulphur and plant density. Indian Journalof Agronomy 41 (2): 290-295.

Aliari, H., Shirani rad, A., and Dehshiri, A., 2002. Canola Guide. Journal of Agricultural Education Publication. Tehran, Iran.

Amirmoradi, S., 1999. Effects of planting density on yield, yield components of winter canola cultivars, growth index. M.Sc. Thesis, Faculty of Agricultural Sciences, University of Guilan, Iran. (In Persian with English Summary)

Andersen, M.N., Heidmann, T., and Plavborg, F, 1996. The effects of drought and Nitrogen on light interception, growth and yield of winter oilseed rate. Soil and Plant Science 46(1): 55-67.

Azizi, M., Soltani, A., and khavari, S., 2004. Rapeseed (Physiology, Agronomy, Biological Technology). Mashhad University Press Jihad Daneshgahi, Mashhad, Iran. 232 pp. (In Persian)

Beheshti, A., Koocheki A., and Nassiri Mahallati, M., 2002. Effect of planting pattern on light absorption and conversion efficiency in three varieties of maize canopy. Seed and Plant Production Journal 18(4): 417-431 (In Persian with English Summary)

Chay, P., and Thurling, N., 1989. Variation in pod length in spring rape (Brassica napus L.) and its effect on seed yield and yield components. Journal of Agricultural Sciences, Cambridge 113: 139- 147.

Degenhart, D.F., and Kondra, Z.P., 1984. Relationships between seed yield and growth characters, yield components, seed quality of summer-type oilseed rape (Brassica napus L.). Euphytica 33(3): 885-889.

Diepenbrock, W., 2000. Yield analysis of winter oilseed rape (Brassica napus L.): A review. Field Crops Research 67(1): 35-49.

Ganjali, A., Malekzadeh, S., and Bagheri, A., 2000. Review of plant density and arrangement of peas grown under irrigation in the region Neyshabur trend indicators. Journal of Food Science and Agriculture 14(2): 535-536

Gholipour, A.S., Latifi, N., Glzany, K., Ghasemi, E., and Lyary Front, M., 2004. Comparative growth and yield of canola in Gorgan dryland conditions. Journal of Agricultural Sciences and Natural Resources 11(1) 14-28 (In Persian with English Summary)

Gusta, L., Johnson, E.N., Nesbitt, T., and Kirkland, K., 2004. Effect of seeding date on canola seed quality and seed vigour. Canadian Journa Plant Science 84: 463-471.

Hassan, K.H., and Hakeem, M.S.E., 1996. Response of some rapeseed cultivars to nitrogen rates and plant density under saline conditions at Siwa Oasis. Annals of Agricultural Science Cairo 41(1): 229-242.

Keating, B.A., and Carberry, P.S., 1993. Resource captures and use in intercropping solar radiation. Field Crops Research 34: 273-301.

Kemanian, A.R., Stockle, C.O., and Huggins, D.R., 2004. Variability of barley radiation use efficiency. Crop Science 44: 1662-1672.

Kiniry, J.R., Jones, C.A., and Sparel, D.A., 1989. Radiation use efficiency in biomass accumulation prior to grain filling for five grain crop species. Field Crops Research 20: 51-64

Kiniry, J.R., Simpson, C.E., Schuber, A.M.T., and Reed, J.D., 2005. Peanut leaf area index, light interception radiation use efficiency and harvest index at three sites in Texas. Field Crops Research 91: 297-306.

Leach, J.E., Stevenson, H.J., Rainbow A.J., and Mullen, L.A., 1999. Effects of high plant populations on the growth and yield of winter oilseed rape (Brassica napus L.). Journal of Agricultural Science 132(2): 173-180.

Malhi, S., and Gill, K.S., 2004. Placement, rate and source of N, seed row spacing and seeding depth effects on canola production. Canadian Journal Plant Science 84: 719-729.

Mendham, N.J., Shipway, P.A., and Scot, R.K.T., 1981. The effects of delayed sowing and weather on growth, development and yield of winter oil-seed rape (Brassica napus L.). Journal of Agricultural Sciences, Cambridge 96: 389-416.

Montieth, J., and Unsworth, M., 1990. Principles of environmental physics. Edward Arnold. London, UK. 291 pp.

Morgan, D.G., 1982. The regulation of yield components in oilseed rape (Brassica napus L.). Journal of the Science of Food and Agriculture 33: 1266-1268.

Omidi, H., Tahmasbi Sarvestani, Z., Ghalavand, A., and Modares Sanavi, S.A.M., 2005. Assessment of tillage systems and row spacing on seed yield and oil content of rapeseed cultivars. Iranian Journal of Crop Science 7(2):97-111 (In Persian with English Summary)

Ozer, H., 2003. The effect of plant population densities on growth, yield and yield components of two spring rapeseed cultivars. Plant Soil Environment 49(9): 422-426.

Rao, M.S.S., Mendham, N.J., and Buzza, G.C., 1991. Effect of the apetalous flower character on radiation distribution in the crop canopy, yield and its components in oilseed rape (Brassica napus L.). Journal of Agricultural Science, Cambridge 117: 189-196.

Rietveld, M.R., 1987. A new method for estimating the regression coefficient in the formula relating solar radiation to sunshine. Agricultural Meteorology 19: 243-252.

Shirani Rad, H., and Ahmadi, M.R., 1996. Kashtv history of plant density on crop yield, growth and yield of two cultivars of winter rapeseed oil in Karaj. Congress on Agronomy and Plant Breeding, University of Isfahan, Isfahan, Iran. P. 146. (In Persian)

Sidlauskas, G., and Bernotas, S., 2003. Some factors affecting seed yield of spring oilseed rape (Brassica napus L.). Agronomy Research 1(2): 229-243.

Toliat Abolhasani, M., 2005. Effect of planting density and arrangement on agronomic and quality characteristics of winter rapeseed in Mashhad. M.Sc. Thesis, Faculty of Agriculture, University Tarbiat Modares, Tehran, Iran. (In Persian with English Summary)

Wells, R., 1991. Soybean growth response to plant density: Relationship among canopy photosynthesis, leaf area and light interception. Crop Science 31: 755- 761.

Zamani, G., and Koocheki, A., 2004. The arrangement and plant density on radiation absorption, seed yield and yield components of maize. Journal of Food Science and Agriculture 8(2): 30-44 (In Persian with English Summary)

Zavareh, M., and Imam, Y., 2000. Help identify stages in the life of rapeseed (Brassica napus L.). Iranian Journal of Crop Science 2(1): 14-26 (In Persian with English Summary)