The influence of different Acacia senegal agroforestry systems on soil water and crop yields in clay soils of the Blue Nile region, Sudan

Raddad, El Amin Yousif; Luukkanen, Olavi

doi:10.1016/j.agwat.2006.06.001

Cited by 37 publications

(25 citation statements)

References 33 publications

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“…However, if there is no temporal and spatial niche differentiation between trees and crops for capture of above and belowground growth resources (complementary resource utilisation) then these systems are likely to fail (Anderson and Sinclair 1993). Although competition for water between hedgerows and crops has been studied in the semi-arid tropics of Kenya (McIntyre et al 1997), quantitative studies on soil water competition in agroforestry systems are generally limited (Ong et al 1991;Raddad and Luukanen 2007). According to Teixeira et al (2003) an understanding of the impacts of different tree species and management regimes on soil water depletion and crop production across a range of agroforestry systems is a major research requirement.…”

Section: Introductionmentioning

confidence: 98%

Soil water competition in a temperate hedgerow agroforestry system in South Africa

Everson

Niekerk

2008

Agroforest Syst

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An on-farm trial was conducted to determine dry matter production of four fodder tree species and their effect on soil water and maize production. The trees were planted in rows intercropped with maize. The four tree species selected were Acacia karroo Hayne (indigenous fodder tree), Leucaena leucocephala (Lam.) De Wit (nitrogen fixing), Morus alba L. (fodder and fruit), and Gleditsia triacanthos L. (fodder and fuel). Volumetric soil water was measured in the upper 0.3 m of soil in each row of the trial using the time domain reflectometry technique. The neutron probe technique was used for monitoring the water content deeper in the soil. Geostatistical methods were used to analyse treatment differences in the upper 0.3 m of soil. The soil water content did not differ significantly between the maize and tree rows indicating that competition for water in the upper horizon was not the reason for lower maize yields. However, at greater soil depths (75-125 cm) trees in the wide spacing used less water than those in the narrow spacing. Light interception was an important factor in reducing maize yields in the row nearest to the trees. High soil water values recorded during summer indicated that in the current cycle of good rainfall the plants in the agroforestry trial were not stressed. Thus the trees do not compete with the crops for soil moisture in good rainfall seasons. However, this study would need further evaluation for the competition for water for the low rainfall years. Since the trees have access to water at greater depths, they are likely to be more productive into the dry season than shallow rooted crops.

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Section: Introductionmentioning

confidence: 98%

Soil water competition in a temperate hedgerow agroforestry system in South Africa

Everson

Niekerk

2008

Agroforest Syst

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“…It is a multipurpose species that besides gum arabic provides valuable livestock fodder and fuel wood (Raddad and Luukkanen 2006a). The species can restore soil fertility because of its ability to fix N 2 , which is beneficial for crop production in the gum arabic agroforestry systems in drylands of sub-Saharan Africa (Raddad and Luukkanen 2006b). The gum is an international commodity used in food, pharmaceutical, and cosmetic industries and for a wide range of other purposes (Fagg and Allison 2004).…”

Section: Introductionmentioning

confidence: 99%

Study of quantitative genetics of gum arabic production complicated by variability in ploidy level of Acacia senegal (L.) Willd

Diallo

Ræbild

Kjær

2015

Tree Genetics & Genomes

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Gum arabic is an important international commodity produced by trees of Acacia senegal across Sahelian Africa, but documented results of breeding activities are limited. The objective of this study was to provide reliable estimates of quantitative genetic parameters in order to shed light on the breeding potential for improvement of gum yield and quality. For this purpose, we measured growth on 617 offspring from 60 open-pollinated trees after 18 years, and gum yield and quality based on two seasons, 18 and 19 years after establishment. Genotyping with eight microsatellite markers revealed that progenies consisted of both diploid and polyploid trees, and growth, gum yield, and gum quality varied substantially among ploidy level, populations, and progenies. Analysis of molecular variance and estimates of outcrossing rate supported that trees within open-pollinated families of diploids were half sibs, while the open-pollinated families of polyploids showed low variation within families. The difference in sibling relationship observed between ploidy levels complicated estimation of genetic parameters. However, based on the diploid trees, we conclude that heritability in gum arabic production is low to high with presence of high levels of additive genetic variation, although the genetic parameters could only be estimated with fairly high standard error. The findings suggest that improvement through breeding can increase the productivity of A. senegal substantially. However, the results also stress the importance of testing ploidy levels of selected material and use of genetic markers to qualify the assumptions in the quantitative genetic analysis.

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“…raddiana. Raddad and Luukkanen (2007) found no negative effect of Acacia senegal on sesame and sorghum yields, when intercropping Acacia trees with two annual crops. Improvement of soil fertility under tree canopy should be added as other positive effect.…”

Section: Discussion:-mentioning

confidence: 93%

“…In fact, intercropping is known to be beneficial when the LER value is greater than 1, meaning that the production per land surface unit is higher than for monocroping (Raddad and Luukkanen, 2007)..…”

Section: Discussion:-mentioning

confidence: 99%

The Effects of a Jatropha Curcas-Based Agroforestry System on Soil Water Dynamics and Groundnut Yield in Sudano-Sahelian Zone, Senegal.

Diédhiou¹,

Diop²,

Sène³

et al. 2017

IJAR

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The influence of different Acacia senegal agroforestry systems on soil water and crop yields in clay soils of the Blue Nile region, Sudan

Cited by 37 publications

References 33 publications

Soil water competition in a temperate hedgerow agroforestry system in South Africa

Soil water competition in a temperate hedgerow agroforestry system in South Africa

Study of quantitative genetics of gum arabic production complicated by variability in ploidy level of Acacia senegal (L.) Willd

The Effects of a Jatropha Curcas-Based Agroforestry System on Soil Water Dynamics and Groundnut Yield in Sudano-Sahelian Zone, Senegal.

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