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Effects of different sowing date and the combined effects of sowing date and seed rates on the performance of wheat (Triticum aestivum L.)/faba bean (Vicia faba L.) intercropping system

Temporal complementarity in resource use is not well understood in wheat (Triticum aestivum) /faba bean (bean; Vicia faba) intercropping system. Results from a field experiment involving this intercrop combination indicate no benefit in resource use by delaying bean sowing date (BSD), as the total intercrop (wheat + bean) seed yields were reduced with delay in BSD. Averaged across wheat seed rate, total intercrop seed yields were 586 g/m2, 490 g/m2 and 422 g/m2 for simultaneous sowing of wheat with bean, 23 days delay in BSD and 37 days delay in BSD respectively. Although wheat seed yields were greater with delay in BSD, this had lesser effects on the overall total intercrop seed yields. Conversely, bean seed yields were greater the early the beans were sown and this had substantial impact on the total intercrop yield. This indicates that bean was the main determinant of variations in intercrop productivity. Biomass yields mainly determine seed yield variation in response to BSD for both wheat and bean.

Effects of different sowing date and the combined effects of sowing date and seed rates on the performance of wheat (Triticum aestivum L.)/faba bean (Vicia faba L.) intercropping

Int. J. Agr. & Agri. R. International Journal ong>ofong> Agronomy ong>andong> Agricultural Research (IJAAR) ISSN: 2223-7054 (Print) Vol. 2, No. 3, p. 24-40, 2012 http://www.innspub.net RESEARCH PAPER OPEN ACCESS ong>Effectsong> ong>ofong> ong>differentong> ong>sowingong> ong>dateong> ong>andong> ong>theong> ong>combinedong> ong>effectsong> ong>ofong> ong>sowingong> ong>dateong> ong>andong> ong>seedong> ong>ratesong> on ong>theong> performance ong>ofong> wheat (Triticum aestivum L.)/faba bean (Vicia faba L.) intercropping system Ibrahim Yahuza Crops Research Unit, Department ong>ofong> Agriculture, ong>theong> University ong>ofong> Reading, RG6 6AR, Berkshire, United Kingdom Received: 11 January 2012 Revised: 22 January 2012 Accepted: 10 February 2012 Key words: Wheat/faba bean intercropping system, bean ong>sowingong> ong>dateong>, temporal resource use, spatial resource use. Abstract Temporal complementarity in resource use is not well understood in wheat (Triticum aestivum) /faba bean (bean; Vicia faba) intercropping system. Results from a field experiment involving this intercrop combination indicate no benefit in resource use by delaying bean ong>sowingong> ong>dateong> (BSD), as ong>theong> total intercrop (wheat + bean) ong>seedong> yields were reduced with delay in BSD. Averaged across wheat ong>seedong> rate, total intercrop ong>seedong> yields were 586 g/m 2 , 490 g/m 2 ong>andong> 422 g/m 2 for simultaneous ong>sowingong> ong>ofong> wheat with bean, 23 days delay in BSD ong>andong> 37 days delay in BSD respectively. Although wheat ong>seedong> yields were greater with delay in BSD, this had lesser ong>effectsong> on ong>theong> overall total intercrop ong>seedong> yields. Conversely, bean ong>seedong> yields were greater ong>theong> early ong>theong> beans were sown ong>andong> this had substantial impact on ong>theong> total intercrop yield. This indicates that bean was ong>theong> main determinant ong>ofong> variations in intercrop productivity. Biomass yields mainly determine ong>seedong> yield variation in response to BSD for both wheat ong>andong> bean. Biomass yields variations in response to BSD (ong>andong> so ong>seedong> yields) were attributed mainly to spatial complementarity in accumulated photosynong>theong>tically active radiation (PAR). For ong>theong> ong>combinedong> ong>effectsong> ong>ofong> BSD ong>andong> wheat ong>seedong> ong>ratesong>, irrespective ong>ofong> ong>theong> index used for evaluation, greatest intercrop performance was found when wheat ong>andong> bean were sown simultaneously. Moreover, it was demonstrated that Area time equivalency ratio ong>andong> crop performance ratio ‘time corrected’ could be calculated using ong>theong>rmal time to evaluate intercrop performance. * Corresponding Author: Ibrahim Yahuza yiahmed@yahoo.co.uk Yahuza Page 24

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