A. A. Ramalan

• PhD
• Professor (Full) at Ahmadu Bello University

The objective of this study was to predict the probabilities of occurrences of long dry spells and their lengths during the planting period in rainfed farming season for future planning in Gusau and its environs North-Western Nigeria. Markov chain and probability distribution models were used to help predict in advance the longtime dry spells occur...

Groundwater salinization studies and recharge estimation were carried out at the Irrigation Research Station, Kadawa, Nigeria. Groundwater samples from fifteen randomly selected piezometer locations were analyzed monthly for chloride using Mohr’s method for three years while recharge was estimated using the chloride mass balance (CMB) method. Groun...

The potential of managed aquifer recharge (MAR) in semi-arid areas of Nigeria was evaluated using the Kano River irrigation Project (KRIP) as a case study. Groundwater recharge was evaluated daily for 3 years (2009–2011) using the water level fluctuation (wlf) method. Temporal and spatial analyses of recharge were carried out using Microsoft Excel®...

Assessment of soil erosion and sediment yield in furrow irrigation is limited in Samaru-Zaria. Data was collected in 2009 and 2010 and was used to develop a dimensionless model for predicting furrow irrigation-induced erosion (FIIE) using the dimensional analyses approach considering stream size, furrow length, furrow width, soil infiltration rate,...

Furrow irrigation proceeds under several soil-water-furrow hydraulics interaction dynamics. The soil erosion consequences from such interactions in furrow irrigation in Samaru had remained uncertain. A furrow irrigation-induced erosion (FIIE) model was used to simulate the potential severity of soil erosion in irrigated furrows due to interactive e...

A field experiment was conducted at Melkassa Agricultural Research Centre in the Central Rift Valley of Ethiopia (located at latitude 8° 24'N, longitude 39° 21'E and altitude 1,550 m above sea level) during the 2008/2009 dry season to study the ‘Effect of deficit irrigation and different mulch covers on water use and yield of drip irrigated onion (...

2 Abstract: A field experiment was conducted in the 1998 dry season at Kadawa, Nigeria to determine the effect of different levels of nitrogen (0, 60, 120 or 180 kg N hā ), phosphorus (0, 20 or 40 kg P hā ) and irrigation 1 1 (0.6, 0.8 or 1.0 IW/CPE ratio) on nutrient concentration and accumulation in maize. The experiment was a split plot design w...

The study examined the applicability of conservative agents and supplemental irrigation in minimizing the problem of tree seedling establishment in the semi arid-region of Nigeria. Four tree species (Azadirachta indica, T1; Anacardium occidentale, T2; Citrus limon, T3 and Khaya senegalensis, T4), three conservative agents (bare, C1; PAM, C2; and ba...

Current global concerns on attainment of food security and poverty alleviation require new strategies with marked potential for water conservation and yield increase. This informed the design of an affordable continuous-flow drip irrigation system that applies the exact peak crop water requirement continuously throughout the 24 h of a day, and so m...

Field experiments were conducted during the dry seasons of 1995/96 and 1997/98 at Kadawa, in semi-arid Sudan savanna of Nigeria (11° 39′N 08°27′E, 500m above sea level) to study the effect of various moisture regimes on canopy temperature of two wheat cultivars. Moisture regime was imposed using Neutron scattering technique while canopy temperature...

An experiment was conducted at the Irrigation Research Farm of the Institute for Agricultural Research Samaru, Zaria, Nigeria (11 degrees 11'N, 7 degrees 23'E, 686 m above sea level) to assess the influence of applying soil amendment and irrigation schedule on onion growth, yield and irrigation applied. The amendment, Alcosorb 400, at rates 0, 300,...

Onion (Allium cepa L.) is one of the most important vegetable crops grown in the dry seasons of northern Nigeria. The value of the crop depends on the bulb size and storability. Field experiments were conducted during the 1993-94 and 1994-95 dry seasons at Kadawa in the Sudan Savannah ecological zone of Nigeria (11 degrees 39 ' N, 08 degrees 02 ' E...

A field experiment was conducted during the dry season of 1993/1994 at the Irrigation Research Farm, Institute for Agricultural Research, Samaru, Nigeria to evaluate water management options on the performance of tomato. The trial involved three furrow irrigation methods (conventional furrow, conventional furrow with cutback, and alternate furrow),...

The study examined various management strategies implementable for equitable allocation of water among users in a gravity sprinkle irrigation system (GSIS). A computer model was developed and employed to effect allocations under three scenarios or variations thereof, namely, on-demand, rotation, and continuous supply. Historical streamflow records...

Onion (Allium cepa L.) is one of the most important vegetable crops grown in the dry seasons of northern Nigeria. The value of the crop depends on the bulb size and storability. Field experiments were conducted during the 1993-94 and 1994-95 dry seasons at Kadawa in the Sudan Savannah ecological zone of Nigeria (11°39′ N, 08°02′ E) to investigate t...