Water resources and agricultural productivity
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1 Water resources and agricultural productivity
Sudan is a water scarce country with the Internal Renewable Water Resources (IRWR) estimated at 32 billion
m
3
/year bringing the per capita water availability below the water stress threshold of 1,000 m
3
/year
(MoIWR, 2021). The Nile river contributes the largest share – 20.5 billion m
3
/year measured at the Sennar
Dam on the Blue Nile (Elamin, 2013). This amount is in line with the 1959 agreement that governs the Sudan
water share of the estimated 84 billion m
3
annual average Nile river flow recorded at the Egyptian Aswan
Dam at the border between the two countries (FAO, 2015). The seasonal streams and groundwater
resources provide about 6.7 billion m
3
/year and 4.8 billion m
3
/year respectively (MoIWR, 2021). Rainfall is
marked by erratic intensity, large seasonal variability, uneven distribution and concentration in a short-wet
season. Average annual rainfall is 200 mm/year, but ranges from 25 mm/year in the dry north up to 700
mm/year in the south (FAO, 2015).
The agriculture sector is the biggest consumer of water resources at more than 90% (FAO, 2015). It is also
the largest potential contributor to the Sudanese economy. It provides livelihoods and job opportunities
for nearly 70% of the country’s estimated 44 million population. Before the oil exports came on line in
1999, agricultural products accounted for upwards of 95 percent of exports and the sector contributed to
nearly 60% of the GDP (Berry, 2015). In the past three decades, however, the agriculture sector has been
on a declining trend due to a combination of factors: neglect by the then government as more attention
went to the oil and services sectors; lack of up-to-date coherent policies and strategies resulting in
inadequate investment, research and capacity building programme (MoIWR, 2019); internal conflicts and
instabilities, particularly in the Western and Eastern agricultural hubs (Mahgoub, 2014).
The agricultural production and productivity is currently low compared to global averages or potential
local targets from the Sudanese Agricultural Research Corporation (ARC). For instance, the 2.4 tons/ha
yield of wheat (FAO, 2019) is 50% of the local target and far below the attainable 6 to 9 tons/ha reported
in the FAO AQUASTAT Database
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. Wheat is the most important staple and commercial commodity in
Sudan at the moment. In the 2019/2020 cropping season, the 730,000 tons local wheat production covered
just a third of the 2.6 million tons actual consumption. The country is currently filling the gap through
import, which amounted to $500 million draining the meagre national hard currency reserve and triggering
a cascading negative impact on the economy (Ahmed and Mehari, 2020). Importing wheat is also reliant
on international market dynamics, which the country cannot fully control and this has often resulted in
short supply of bread, a very essential staple food for millions of Sudanese. The yield of sorghum (< 1
ton/ha), another major food crop is also low as compared to the achievable 3.5 to 5 tons/ha. Sugar cane,
a highly commercial crop fares far worse at 10 tons/ha – the optimum yield ranges from 50 to 150 tons/ha.
The Water Productivity (WP) of the major crops is also very low. For instance, as documented by the on-
going FAO funded water productivity improvement project in Gezira irrigation scheme, the majority of the
farmers apply nearly twice the wheat irrigation requirement or about 8,000 m
3
/ha (HRC, 2019). At 2.4
tons/ha, this results in 0.3 kg/m
3
, which is significantly below the optimum range of 0.8 to 1.6 kg/m
3
.
Likewise, the WP of sorghum (0.15 kg/m
3
) is just 15 to 25% of the achievable 0.6 to 1 kg/m
3
. This sorghum
WP analyses is based on the 2017 to 2019 flow measurements conducted in the Gash agricultural scheme,
the major source of food and fodder in Eastern Sudan (HRC and MetaMeta, 2020). The Gash farmers supply
6,200 to 7,140 m
3
/ha while the yield rarely exceeds 1 ton/ha.
The February 2019 Water Sector Conference that brought together more than 150 international and local
professionals (the WaterPIP consortium was represented) highlighted lack of coherent policy roadmap as
one of the major factors for the low agricultural production and water productivity. The frequently cited
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http://www.fao.org/land-water/databases-and-software/crop-information/en/