Situational analysis study for the agriculture sector in Ghana

Agriculture is important for Ghana’s economy and the livelihoods of the majority of the rural population even though its level of contribution to GDP is declining. Its importance is not only in terms of the contribution to food and nutrition security, but also in providing a basis for agro-industrial activities and for exports. It provides jobs and livelihoods to a significant proportion of the population especially in the rural areas. Farmers cultivate major staples such as maize, cassava, yam, plantain, sorghum and rice. The cash crops grown include cocoa, oil palm, cashew and rubber among others. Ghana’s 2019 annual growth rate for agriculture was 4.6%. The crop sub-sector is the largest in the agricultural sector followed by livestock and fisheries. The impacts of climate change on agriculture are not just projected but are real. The sector is currently contending against erratic rainfall patterns, water stress, desertification/ degradation of ecological systems/ forest degradation; increasing temperatures; and disruption of seasonality. Climate change affects agricultural activities in diverse ways including changes in the onset of the rainy season, increase incidence and frequency in some regions, increase in post-harvest losses of agricultural commodities, decline in the availability and quality of forage and high mortality and morbidity of livestock. Managing the impacts of climate change is important in addressing the challenge of enhancing productivity in the agricultural sector. It is a multi-dimensional challenge; hence solutions must emanate from the identifiable components of the environment. Agriculture is given a high priority in Ghana’s political and socio-economic discourse with the President highlighting the agricultural programme of PFJ as the flagship of his government. The various national policy documents including the national development framework have underscored the importance of the agricultural sector. However, there is need to enhance policy coherence and strengthen policy implementation along the governance structures from the national through the regional to the municipal and district assemblies. Farmers and women must have stronger voices at the district level to articulate better their concerns. Besides, Ghana’s national budgetary allocation to the agricultural sector is still below the target of the Maputo Declaration at about 9.7% currently. However, the on-going programmes such as the PFJ and its constituent modules are likely to increase it. The funding from multi- and bilateral sources are also likely to increase agricultural expenditures. The key recommendations proposed include creating an enabling legal, institutional and policy framework to create a favorable environment for enhancing policy coherence and strengthening policy implementation along the governance structures from the national to regional through to the municipal and district assemblies. It is also important to increase national budgetary and finance flows from bilateral and multi-lateral sources into the agriculture sector to promote widespread adoption of Climate Smart Agriculture (CSA). Investments should take into account gender and youth considerations, supported by a strong extension services system. Farmers’ adoption of CSA is an important intervention area that economic planning must cater for. Market access and access to financial resources to finance their agricultural activities in crops, livestock, fishery and agroforestry, are crucial. Government must consider, adopt and implement this recommendation in collaboration with other stakeholders

Location, biophysical and agronomic parameters for croplands in northern Ghana

Smallholder agriculture is the bedrock of the food production system in sub-Saharan Africa. Yields in Africa are significantly below potentially attainable yields for a number of reasons, and they are particularly vulnerable to climate change impacts. Monitoring of these highly heterogeneous landscapes is needed to respond to farmer needs, develop an appropriate policy and ensure food security, and Earth observation (EO) must be part of these efforts, but there is a lack of ground data for developing and testing EO methods in western Africa, and in this paper, we present data on (i) crop locations, (ii) biophysical parameters and (iii) crop yield, and biomass was collected in 2020 and 2021 in Ghana and is reported in this paper. In 2020, crop type was surveyed in more than 1800 fields in three different agroecological zones across Ghana (the Guinea Savannah, Transition and Deciduous zones). In 2021, a smaller number of fields were surveyed in the Guinea Savannah zone, and additionally, repeated measurements of leaf area index (LAI) and leaf chlorophyll concentration were made on a set of 56 maize fields. Yield and biomass were also sampled at harvesting. LAI in the sampled fields ranged from 0.1 to 5.24 m2 m−2, whereas leaf chlorophyll concentration varied between 6.1 and 60.3 µg cm−2. Yield varied between 190 and 4580 kg ha−1, with an important within-field variability (average per-field standard deviation 381 kg ha−1). The data are used in this paper to (i) evaluate the Digital Earth Africa 2019 cropland masks, where 61 % of sampled 2020/21 cropland is flagged as cropland by the data set, (ii) develop and test an LAI retrieval method from Earth observation Planet surface reflectance data (validation correlation coefficient R=0.49, root mean square error (RMSE) 0.44 m2 m−2), (iii) create a maize classification data set for Ghana for 2021 (overall accuracy within the region tested: 0.84), and (iv) explore the relationship between maximum LAI and crop yield using a linear model (correlation coefficient R=0.66 and R=0.53 for in situ and Planet-derived LAI, respectively). The data set, made available here within the context of the Group on Earth Observations Global Agricultural Monitoring (GEOGLAM) initiative, is an important contribution to understanding crop evolution and distribution in smallholder farming systems and will be useful for researchers developing/validating methods to monitor these systems using Earth observation data. The data described in this paper are available from https://doi.org/10.5281/zenodo.6632083 (Gomez-Dans et al., 2022)

Interactive effects of soil compaction, biochar application, and soil water regime on the growth, yield, and water use efficiency of upland rice

ABSTRACT: The mechanization of tropical agriculture by conventional tillage has enhanced production and contributed to soil compaction, which has long term adverse effects on soil and crop productivity. Application of biochar is among the several remedial measures proposed to offset the compaction problem. Yet, it is unclear how biochar interacts with varying soil water that occurs under variable weather to mitigate the compaction problem. In this study, a screen house experiment was conducted to investigate the growth, yield, and water use efficiency (WUE) of upland rice (Nerica 14) grown under a range of biochar-amended compacted soils and soil water conditions. The experimental design was a completely randomized design (CRD) in a factorial arrangement with three bulk density (D) levels (D1= 1.30 Mg m−3, D2 = 1.50 Mg m−3, and D3 = 1.75 Mg m−3), two rates of rice husk biochar (RHB) application: (B) = 0 ton ha−1, and B10 = 10 ton ha−1), and three levels of seasonal irrigation (W1 = 391 mm, W2 = 419 mm, and W3 = 569 mm). Grain yield was influenced by biochar, bulk density and water regime. When averaged across irrigation levels, the B0 grain yields were 1336 kg ha−1, 947 kg ha−1 and 636 kg ha−1 for D1, D2 and D3, respectively. Biochar application reduced both the runoff, drainage, and improved the crop water use efficiency. In terms of WUE, the treatment combination of B10D1W1 and B10D3W3 recorded the highest (14.27 kg ha−1 mm−1), and least (9.28 kg ha−1 mm−1) values, respectively. Though biochar application improved the WUE under all density levels, high irrigation (W2, W3) could not compensate for the adverse effect of increasing soil density. It is concluded that the adverse impact of tillage-induced soil compaction on upland rice yield can be effectively alleviated by biochar application under varied soil water conditions