Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Soudan → The Effect of Spacing of Hashab (Acacia senegal, (L.) Willd) Plantation on Yield of some Traditional Field Crops in Southern Darfur

University of Khartoum (2004)

The Effect of Spacing of Hashab (Acacia senegal, (L.) Willd) Plantation on Yield of some Traditional Field Crops in Southern Darfur

Abdalla, Mustafa

Titre : The Effect of Spacing of Hashab (Acacia senegal, (L.) Willd) Plantation on Yield of some Traditional Field Crops in Southern Darfur

Auteur : Abdalla, Mustafa

Université de soutenance : University of Khartoum

Grade : Doctor of Philosophy (PhD) 2004

Résumé
An experiment was conducted during the rainy seasons, 2001 to 2004, in Nyala locality in southern Darfur to investigate the effect of Acacia senegal on crops yield and to recommend the most appropriate tree spacings for cultivating agricultural crops within Acacia senegal plantations in “Gardud” soils. In addition, to assess gum arabic yield productivity within this system. The tree spacings used were 4x4 m, 4x8 m and 8x8 m. Meanwhile crop species used were millet (Pennisetum glaucum), sorghum (Sorghum bicolor) and sesame (Sesamum indicum). The trial was laid out in a completely randomized block design with three replications for each crop as well as control plots for trees and crops. Tree parameters measured include tree height in (m), tree diameter (cm), tree canopy diameter (m) and tree crown projection (m) as well as tree root profile was excavated to determine lateral tree root zone. The crop variables were ; plant population density in ha, number of leaf/plant, plant height (cm), days to 50% flowering, days to harvesting time, crops yield (kg/ha), 1000-seeds weight (g), straw weight (kg/ha) and land equivalent ratio (LER). Soil parameters namely, soil fertility (nitrogen, organic carbon and phosphorus) as well as soil moisture content were measured. Therefore, soil samples were augured under trees and in the open areas in each plot at varied depths, namely 0-20 cm, 20-40 cm and 40-60 cm and 0-25 cm, 25-50 cm and 50-75 cm in the first two seasons and third season respectively. Besides, composite soil samples were also augured at 30 cm depth under tree canopy and in the open areas as well as control areas to determine soil nitrogen, organic carbon and phosphorus contents. Gum arabic yield was tapped within the tree spacings concerned to determine gum yield production per tree in (g). The results indicated that plant population density, number of leaf/plant and plant height were affected by tree spacings. Therefore, significant differences were obtained within crop species and tree spacings in the different studied seasons. In addition, crop days to 50% flowering and crops days to harvesting time were affected by tree/crop interface as well as soil moisture content in the third season. While, crops yield, 1000- seeds weight and straw weight were affected by both tree spacings and rainfall amounts between the studied seasons. Land equivalent ratio was found higher in the 8x8 m tree spacing for millet and sesame crops. Whereas tree height, tree diameter, tree canopy diameter and tree crown projection were affected by tree/crop interaction particularly in the intercropped plots. Furthermore, tree root zone was superficial and fine roots were spread in the surface soil layer. However, total soil moisture content was found to be higher under this agroforestry system than in open areas, namely in the 4x4 m and the 8x8 m tree spacings.

Présentation

Version intégrale ( 0,271 Mb)

Page publiée le 18 août 2016, mise à jour le 20 juin 2017