摘要
Cowpea (<i><span style="font-family:Verdana;">Vigna</span></i><span style="font-family:Verdana;"> <i>unguiculata</i></span><span style="font-family:Verdana;">) is an important legume crop in the tropics and subtropical regions of the world. It is mainly grown for its leaves and grains, and to a lesser extent as a fodder crop. Cowpea is considered as the most important food grain legume in the dry savannas of tropical Africa. This study compared the yield of local (</span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;">) and improved (SECOW 2W) cowpea varieties grown on an Oxisol. Inorganic P at levels of 0, 10, 20, and 40 kg·ha</span><sup><span style="font-family:Verdana;">-1</span></sup> <span style="font-family:Verdana;">was</span><span style="font-family:Verdana;"> tested on each variety with or without rhizobia inoculation. The experiments were set up in a randomized complete block design and replicated thrice during the short and long rains of the 2015/2016 seasons on fifteen fields in Arua district, northern Uganda. </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;"> responded significantly (P < 0.05) better than SECOW 2W when high rates of inorganic phosphorus (40 kg P ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) were applied. A significant increase of 26.4% and 28.4% in grain yield of </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;"> and SECOW 2W, respectively </span><span style="font-family:Verdana;">was</span><span style="font-family:Verdana;"> obtained after inoculation with rhizobia. We concluded that inoculation and P fertilizer application increased the yield of both varieties, but with inoculation, SECOW 2W performs much better at lower P fertilizer rates than </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;">. Therefore, we recommend growing of SECOW 2W under inoculation with 20 kg P ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> and an application of 40 kg P ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> for </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;"> local cowpea variety in northern Uganda</span><span style="font-family:Verdana;">.</span>
Cowpea (<i><span style="font-family:Verdana;">Vigna</span></i><span style="font-family:Verdana;"> <i>unguiculata</i></span><span style="font-family:Verdana;">) is an important legume crop in the tropics and subtropical regions of the world. It is mainly grown for its leaves and grains, and to a lesser extent as a fodder crop. Cowpea is considered as the most important food grain legume in the dry savannas of tropical Africa. This study compared the yield of local (</span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;">) and improved (SECOW 2W) cowpea varieties grown on an Oxisol. Inorganic P at levels of 0, 10, 20, and 40 kg·ha</span><sup><span style="font-family:Verdana;">-1</span></sup> <span style="font-family:Verdana;">was</span><span style="font-family:Verdana;"> tested on each variety with or without rhizobia inoculation. The experiments were set up in a randomized complete block design and replicated thrice during the short and long rains of the 2015/2016 seasons on fifteen fields in Arua district, northern Uganda. </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;"> responded significantly (P < 0.05) better than SECOW 2W when high rates of inorganic phosphorus (40 kg P ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) were applied. A significant increase of 26.4% and 28.4% in grain yield of </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;"> and SECOW 2W, respectively </span><span style="font-family:Verdana;">was</span><span style="font-family:Verdana;"> obtained after inoculation with rhizobia. We concluded that inoculation and P fertilizer application increased the yield of both varieties, but with inoculation, SECOW 2W performs much better at lower P fertilizer rates than </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;">. Therefore, we recommend growing of SECOW 2W under inoculation with 20 kg P ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> and an application of 40 kg P ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> for </span><i><span style="font-family:Verdana;">Agondire</span></i><span style="font-family:Verdana;"> local cowpea variety in northern Uganda</span><span style="font-family:Verdana;">.</span>
作者
S. M. Nyamaizi
J. B. Tumuhairwe
R. Amayo
C. L. Tumuhe
E. Tereka
D. L. Nabirye
B. B. Obaa
S. M. Nyamaizi;J. B. Tumuhairwe;R. Amayo;C. L. Tumuhe;E. Tereka;D. L. Nabirye;B. B. Obaa(Agassiz Research and Development Centre, Agriculture and Agri-Food, Agassiz, BC, Canada;Faculty of Land and Food Systems, The University of British Columbia, Vancouver BC, Canada;Department of Agricultural Production, College of Agricultural and Environmental Sciences, Makerere University, Kampala, Uganda;Department of Crop Production and Management, Faculty of Agriculture and Animal Sciences, Busitema University, Tororo, Uganda;Department of Environmental Management, Makerere University, Kampala, Uganda;African Rural University, Kagadi, Uganda)