key challenges in smallholder cereal-legume-livestock systems in the guinea savanna of ghana...
TRANSCRIPT
Key challenges in smallholder cereal-legume-livestock systems in
the Guinea savanna of Ghana
Presented by S.S. Buah (CSIR-SARI) and N. Karbo (CSIR-ARI)
Review and Planning Work of Africa Rising-West Africa,
23-25 October 2012, Modern City Hotel, Tamale, Ghana
Rapid transformation of agricultural practices in
northern Ghana are due to: Rapid human population growth Increased pressure on land Increase in agricultural intensification Climate change Increase incidence and severity of diseases, pests
and drought.
Introduction
Technologies that can enhance productivity need to be developed.
At the same time, the natural resource base must be preserved.
Thus, an integrated crop-livestock farming system represents a key solution for enhancing livestock production and safeguarding the environment through prudent and efficient resource use.
Introduction
Poor soil fertility and water availability Land use planning conflicts for integrated sytems Pests and diseases of crops and livestock Parasitic weeds such as Striga
Major challenges to agricultural production in the Guinea savanna of Ghana
Credit and inputs Drought Competition between crops and livestock for
resources Weak institutional mechanisms
Major challenges to agricultural production in the Guinea savanna of Ghana
Traditional farming systems are breaking down under human and livestock population pressure.
Current fallow periods are not long enough to replace exported nutrients
Soil organic matter is very low Nitrogen (N) is the most limiting nutrient. Phosphorus (P) is the second most limiting
nutrient
Soil fertility and Water
Poor soil and many mouths to feed
Smallholder farmers apply too little fertilizer, either because they cannot afford more or because fertilizers are not readily available.
Both mineral fertilizers and organic inputs are required to improve soil fertility
Soil fertility and Water
•Although mineral fertilizers can be used to replace nutrient losses, socio-economic constraints such as high prices and lack of credit limit their use. •Smallholder farmers commonly apply too little fertilizer, either because they cannot afford more or because fertilizers are not readily available.
Integrated crop-livestock systems could improve soil fertility in short fallow or continuous cropping systems.
Increased use of organic and inorganic fertilizers together with diversification of cropping to include legumes are important tools in restoring or sustaining soil fertility in northern Ghana
Soil fertility and Water
•Although mineral fertilizers can be used to replace nutrient losses, socio-economic constraints such as high prices and lack of credit limit their use. •Smallholder farmers commonly apply too little fertilizer, either because they cannot afford more or because fertilizers are not readily available.
Problems with availability of water for all year round use for crop and livestock production
Bush fires Socio-cultural problems
Soil fertility and Water
•Although mineral fertilizers can be used to replace nutrient losses, socio-economic constraints such as high prices and lack of credit limit their use. •Smallholder farmers commonly apply too little fertilizer, either because they cannot afford more or because fertilizers are not readily available.
unfertilized maize crop Fertilized maize
Crop production vs. grazing land for livestock Urbanization Bush fires Policy void
Land use planning conflicts
Insect pests are a major constraint to legume production, particularly cowpea.
Commercial production of cowpea in northern Ghana is probably not feasible without the using insecticide.
Major insects of cowpea are flower thrips [Megalurothrips sjostedti (Trybom)], the legume pod borer (Maruca vitrata) and a range of pod-feeding bugs
Pests and diseases
Groundnut yields are traditionally low, due to several constraints including pests and diseases.
Aphids (Aphis craccivora) are a serious pest as well
as a vector of virus diseases, such as the rosette
Major biotic constraint to groundnut production include groundnut rosette disease (GRD), early leaf spot (ELS), late leaf spot (LLS) and rust
Pests and diseases
Livestock diseases retard the introduction of more productive breeding stock and new technologies and creating an adverse impact on crop-livestock integration
The most important diseases are vector-transmitted parasitic and viral diseases.
Pests and diseases
Integrated pest management (IPM) involves
- integrating biological control, - cultural practices such as modified planting date, - disease- and pest-tolerant cultivars, - and pesticides where necessary This can increase the effectiveness of pest control
and reduce overuse of pesticides.
Pests and diseases
Striga hermonthica on cereals Striga gesnerioides on legumes
Both parasites are difficult to control because they produce large numbers of seeds and up to 75% of the crop damage is done before they emerge from the ground.
Parasitic weeds
Weed Control
The increasing incidence of striga has been attributed to
- poor soil fertility and structure
- intensification of land use through continuous cultivation and
- an expansion of cereal production.
Striga damage can be reduced by growing tolerant or resistant varieties
Parasitic weeds
Striga damage can be reduced by planting trap crops such as groundnut, soybean, cowpea and sesame that stimulate striga seed to germinate without providing a viable host
Coping strategies of farmers include hand-roguing, application of inorganic fertilizer, manures, compost and crop rotations.
Parasitic weeds
Inadequate credit Weak seed systems Lack of implements for mechanization High cost and accessibility of fertilizers Feeds and markets Appropriate technologies
Credit and inputs
Trend of decreasing rainfall and increasing temperatures
Probability of drought is highest at the start and end of the growing season,
Timing of deficits is unpredictable
Drought
Several strategies have been developed for the conservation of soil and water to maintain productivity including
- rainwater harvesting, - live barriers, - supplementary irrigation, - minimum tillage, - mulching, - bunded basins, and - tree planting
Drought
In smallholder farming systems there are conflicts over the use of the precious crop residues for:
• soil cover and organic matter replenishment • livestock feed• housing, • craft materials and • energy source.
Competition between crops and livestock for resources
Crop residues provide highly valued fodder for livestock in northern Ghana, particularly in the drier Upper East region.
Feeding livestock, especially during the dry season is a major constraint to livestock development in northern Ghana
Competition between crops and livestock for resources
Stover removed and stored for feeding livestock
Stover removed and used for weaving basketsStover removed and stored for fencing, fuel or roofing
Stover removed and used for feeding livestock
Livestock graze freely on crop residue
Integrating crop and livestock production offers ways to increase
production while protecting the environment.
As an investment and insurance against risk, Used for traction Provide meat, milk, hides, and manure, Used as means of transport. can be converted into prompt cash in times of
need. Used for ceremonies, paying bride price and
source of savings
Cultural and economic value of livestock in in the Guinea savanna zone
livestock and crops are produced within a coordinated framework.
The waste products of one component serve as a resource for the other.
Manure is used to enhance crop production; crop residues and by-products feed the animals,
supplementing often inadequate feed supplies, thus contributing to improved animal nutrition and productivity.
Advantages of the integrated system
Maintenance of the soil productive capacity; Product diversification and higher yields and
quality at less cost; Reduction of crop pests (less pesticide use and
better soil erosion control); and Reduction of rural urban migration and the
creation of new job opportunities in rural areas.
Advantages of the integrated system
Cereal-legume rotation Cereal-legume intercrop
Weak linkages among research –extension and farmers Poor communications among farmers, extension agents,
and researchers leading to low adoption of promising technologies generated by research.
Extension workers do not possess adequate knowledge in
all crop and livestock production issues.
Weak research and extension messages towards systems
Weak institutional mechanisms
Attitudes Mindsets Policy issues Institutional and technical concepts Other projects are competing for the AEA’s time
Weak institutional mechanisms
Use of productive but more sustainable management practices can help resolve these production problems.
With the majority of the population in Ghana dependant on agriculture for their livelihoods, technological options that increase agricultural productivity and help to buffer farmers against the negative impacts of climate related and other constraints should be promoted.
Conclusions
Africa Research in Sustainable Intensification for the Next Generation
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