Phosphorus Fertilizer Rating and Rhizobia Inoculation for Improved Productivity of Cowpea in Northern Uganda

• 作者: B. B. Obaa C. L. Tumuhe D. L. Nabirye E. Tereka J. B. Tumuhairwe R. Amayo S. M. Nyamaizi
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Phosphorus Fertilizer Rhizobia Inoculation Agondire SECOW 2W YIELD
• 年，卷（期）: 2020,（9）
• 页码范围: 1505-1519
• 页数: 15页
• 分类号: O17

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>^{<span style="font-family:Verdana;">-1</span>} <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>^{<span style="font-family:Verdana;">-1</span>}<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