Effects of Poultry Manure Rates and Rhizobial Inoculation on Vegetative Growth of Groundnut in Sudan Savannah of Nigeria
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Abstract
Groundnut (Arachis hypogaea L.) is a vital crop in the Sudan savannah of Nigeria, contributing significantly to nutrition, livelihoods, and soil fertility. However, its yield remains low due to poor soil fertility and limited use of organic and biological inputs. A field experiment was conducted at Gaya, Kano State, during the 2024 rainy season to evaluate the effects of microbial inoculation and poultry manure on groundnut vegetative growth. The study employed a 2 × 2 × 3 factorial arrangement in a randomized complete block design (RCBD) with three replications (12 treatment combinations). Treatments comprised two varieties (Samnut 20 and Samnut 21), two microbial inoculation levels (inoculated and non-inoculated), and three poultry manure rates (0, 5, and 10 t ha-1). Data on plant height, number branches, leaf count, and leaf area were recorded at 3, 5, and 7 weeks after sowing (WAS). Poultry manure significantly (p ˂ 0.05) influenced all growth parameters, with 10 t ha-1 producing 28-42 % height values than the control. At 7 WAS, plant under 10 t ha-1 achieved the tallest height (29.16 cm), greatest branch number (40.95), highest leaf count (163.89), and largest leaf area (29.16 cm2). Microbial inoculation showed no significant effect on most parameters, though minor interactions with variety occurred at early stages. Samnut 21 exhibited greater vegetative vigor than Samnut 20. Overall, Poultry manure, at 10 t ha-1 markedly improved groundnut growth under the sandy soils of the Sudan savannah, underscoring its value as a sustainable soil fertility amendment. The limited response to microbial inoculation suggests the need for further testing of site-specific strains for enhanced compatibility and field performance.
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