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Sudan Journal of Agricultural Research

Effect of different plant populations and nitrogen rates on irrigated sunflower

II- Yield and yield components

Ahmed E. Daffalla¹, A. A. Hussain¹, and M. E. Lazim²


Abstract

A field experiment was carried out during the seasons of 1995 and 1996 to evaluate the response of irrigated sunflower (Helianthus annuus) to three plant populations namely 55555, 83335 and 166666 plants/ha and four nitrogen levels (0, 43, 86 and 129 kg/ha) and their interactions. Plant population had marked influences on yield and yield components. The medium and high populations (P2 and P3) produced higher seed yields than the lower population (P1) in both seasons and differences were significant in the second season, mainly due to the greater number of seeds per unit area; despite the higher percentage of empty seeds and smaller heads and seeds of both populations. Application of nitrogen at the higher doses (2N and 3N) significantly increased seed yield and other attributes over the lower doses, and decreased the percentage of empty seeds. Interaction (PXN) also revealed significant differences on yield and some other attributes
 

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Sudan Journal of Agricultural Research Vol. 7 (2006) PP. 19-26