Acta Agronomica Hungarica
Volume/Issue:
Volume 51: Issue 1
Response of two sunflower hybrids to planting dates and densities
Authors: A. Y. Allam 1 , G. R. El-Nagar 2 , and A. H. Galal 3
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  • 1 Department of Agronomy, Faculty of Agriculture, Assiut University Assiut, Egypt
  • 2 Department of Agronomy, Faculty of Agriculture, Assiu University Assiut, Egypt
  • 3 Department of Agronomy, Faculty of Agriculture, Assiut university Assiut, Egypt
DOI:
https://doi.org/10.1556/AAgr.51.2003.1.4
Page Count:
25–35
Publication Date:
01 Apr 2003
Online Publication Date:
22 Jul 2005
Article Category:
Research Article
Restricted access

This investigation was carried out at the Experimental Farm of Assiut University during the summers of 2000 and 2001 to study the responses of two sunflower hybrids (Vidoc and Euroflora) to planting dates (May 1st, June 1st and July 1st) and planting densities (55,533, 83,300 and 166,600 plants/ha). The results indicated that the two varieties differed highly significantly in all studied traits except oil yield/ha. The highest seed yield (3.64 t/ha) was obtained with the variety Vidoc. In addition, the results revealed that the planting date exerted a highly significant influence on all vegetative growth traits along with yield and its components. Increasing plant density increased the seed and oil yield/ha. By contrast, the stem diameter, head diameter, 100-seed weight and seed yield/plant decreased with increasing plant density. The interaction between varieties and plant density had a highly significant effect on head diameter. The greatest head diameter (20.06 cm) was recorded for the variety Vidoc planted at lower density. Concerning the interaction between planting density and planting date, the highest seed yield (4.47 t/ha) was obtained from dense plants at the early sowing date, and the highest oil % (45.32) at the late planting date and the lowest plant density. The second order interaction exerted a highly significant influence on stem and head diameter in addition to seed yield/plant, where the highest value (78.13 g/plant) was obtained with the variety Vidoc planted on May 1st at the lowest plant density.

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Cover Acta Agronomica Hungarica
Acta Agronomica Hungarica
Print ISSN:
0238-0161
Online ISSN:
1588-2527
Keywords:
sunflower; sunflower; sunflower; planting dates; planting densities

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