Document Type : Original Article


1 M.Sc in Agronomy, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

2 Professor, Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran


A field experiment was conducted in 2010, to evaluate the effects of plant density (D1, D2 and D3: 8, 14 and 20 plant/m2) on field performance of Sorghum under different nitrogen application rates (N1, N2 and N3: application of 40, 80 and 120 kg/ha Nitrogen, respectively). The experiment was arranged as factorial based on randomized complete block design in three replicates. Results indicated that as plant density increased tillers per plant, Steam diameter and days to 50% flowering decreased, the effects of N application rate on these traits were not significant. While tillers per unit of area increased as more plant density. Plant height not affected by both treatments. As plant density and N application rates raised grain yield increased. Thus, N application and plant density increases can raise yield of grain sorghum


Ayub M, Tanveer A, Nadeer MA, Tayyub M (2003). Fodder yield andquality of sorghum as influence by different tillage method and seed rates. Pakistan Journal of Agronomy, 2 (3): 179-184.
Caliskan S, Aslan M, Uremis I, Caliskan ME (2007). The effect of rowspacing on yield and yield components of full season and doublecropped soybean. Turk. Journal of Agriculture, 31: 147-154.
Caravetta CJ, Cherney J, Johnson H (1990). Within row spacing influences on diverse sorghum genotypes. I. Morphology. Agronomy Journal, 82(2): 206-210.
Cox WJ (1996). Whole plant physiological and yield responses of maize to plant density. Agronomy Journal. 88: 489-496.
El-Hattab HS, Hussein MA, El-Hattab AH, Raouf MSA, El-Nomany AA (1980). Growth analysis of maize plant in relation to grain yield as affected by nitrogen levels.Zeitschrift fur Acker- und Pflanzenbau,149: 46-57
Ferraris R, Charles DA (1986). Comparative analysis of the growth of sweet and forage sorghum crop. I. Dry matter production, phenology and morphology. Australian Journal of Agriculture Research, 37(5):513-522.
Garrison R, Briggs WR (1972). Internodal growth in localized darkness. Botanical Gazette (Chicago),133: 270-276.
Henke J, Breustedt G, Sieling K, Kage H (2007). Impact of uncertainty on the optimum nitrogen fertilization rate and agronomic, ecological and economic factors in an oilseed rape based crop rotation.
Journal of Agriculture Science Cambridge, 5:455-68.
Ibrahim SA, Hala K (2007). Growth, yield and chemical constituents of soybean (Glycin max L.) plants as affect by plant spacing under different irrigation intervals. Research Journal of Agriculture Biology Science, 3(6): 657-663.
Jamieson PD, Semenov MA (2000). Modeling nitrogen uptake and redistribution in wheat. Field Crops Research, 68: 21-29.
Jettner R, Loss SP, Siddique KHM, Martin LD (1998a). Response of faba bean to sowing rates in southwestern Australia. I. seed yield and economic optimum plant density. Australian Journal of Agriculture Research. 49: 989-998.
Jettner R, Loss SP, Siddique KHM, Martin LD (1998b). Response of faba bean to sowing rates in southwestern Australia. II. Canopy development radiation absorption and dry matter partitioning. Australian Journal of Agriculture Research. 49: 999-1008.
Khaliq T, Ahmad A, Hussain A, Ali MA (2009). Maize hybrids response to nitrogen rates at multiple locations in semiarid environment. Pakistan Journal of Botany, 41(1): 207-224.
Krishnareddy SR, Stewart BA, Payne WA, Robinson CA, Thomason RC (2006). Tillering in dryland grain sorghum clumps as influenced bylight, planting density and geometry. Southern Conservation Systems Conference, Amarillo TX, June 26-28.
Lafarge TD, Broad IJ, Hammer GL(2002). Tillering in grain Sorghum over a wide range of population densities: Identification of a common hierarchy for tiller emergence, Leaf area development and fertility. Annals of Botany, 90: 87-98.
Lemerle D, Verbeek B, Diffey S(2006). Influence of field pea (Pisum sativum) density on grain yield and competitiveness with annual rye grass (Lolim rigidum) in south-eastern Australia. Australian Journal of Experimental Agriculture, 46: 1465-1472.
Lemerle D, Causens RD, Gill LS, Peltzer SJ, Moerkerk M, Murphy CE, Collins D, Cullis BR (2004).
Reliability of higher seeding rates of wheat for increased competitiveness with weeds in low rainfall environment. Journal of Agriculture Science, 142: 395- 409.
Ma BL, Subedi KD, Stewart DW, Dwyer LM (2006). Dry matter accumulation and silage moisture changes after silking in leafy and dual purpose corn hybrids. Agronomy Journal, 98: 922-929.
McMurray L (2004). Plant density inputs Kaspa field pea’s grain yield. Australian Farm journal, 45-46.
McRae FJ, McCaffery DW,Mathews PW(2008). Winter crop variety sowing guide. NSW, Department of primary industries. 74-85.
MkhabelaMS, Mkhabela MS, Pali-Shikhulu J (2001). Response of maize (Zea mays L.) cultivars to different levels of nitrogen application in swaziland. Seventh Eastern and Southern African Regional Maize Conference.11th – 15th February. Kenya, 377.381.
Pawlowski F, Jedruszczak M,BojarczykM (1993). Yield of soybean ce Polan on loens soil depending in row spacing and sowing rate. Field Crop Abstracts. 46(2): 978.
Schatz BG, Schneiter AA, Gardner JE(1990). Effect of plant density on grain Sorghum production in north Dakota.North Dakota Farm Research: 47(5): 15-17.
Shepel N, Aristarkhova ML (1982). Effect of stand density on variation on quantitative characters of hetrotic hybrid of grain sorghum. Russian Journal of Agriculture and Research, 124: 44-47.
Spiertz JHJ (2010). Nitrogen, sustainable agriculture, and food security. A review of Agronomy Sustainable Development, 30: 43-55.
Strasil Z,Vorlicek Z,(2002). The effect of nitrogen fertilization, sowing rates and site on yields and yield components of selected varieties of safflower (Carthamus tinctorius L.), Rostlinna Vyroba. 48:307-11.
Tesar GC (1984). Physiological basis of crop growth and development. American Society of Agronomy, Crop Science Society of America. Medison, Wisconsin, 341pp.
Widdicombe WD,Thelen KD (2002). Row width and plant density effects on corn grain production in the northern corn belt. Agronomy Journal. 94:1020-1023.