Contextual data: Ghana - Maize - All years

‹ 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 ›
Ghana total 1,288,600 1,157,621 1,171,390 1,188,837 1,219,601 1,470,076 1,636,428 1,861,883 1,699,135 1,949,897
Ashanti   193,920 183,032 161,816 164,226 169,383 182,848 186,829 253,374 173,735 205,419  
Brong Ahafo   295,680 281,267 358,259 363,595 381,435 402,688 446,263 510,172 434,741 570,350  
Central   247,110 159,622 164,398 166,847 176,222 225,214 231,238 195,394 202,362 192,069  
Eastern   244,000 241,621 206,467 209,542 227,505 280,806 303,400 380,505 364,166 405,377  
Greater Accra   2,610 2,714 2,103 2,134 2,775 2,763 3,312 3,584 4,461 4,681  
Northern   79,050 74,566 96,717 98,157 88,037 131,857 167,501 202,316 192,604 209,353  
Upper East   60,710 60,801 47,422 48,128 40,104 38,256 51,140 62,256 75,273 65,811  
Upper West   20,370 14,650 14,496 14,712 8,756 55,233 70,660 86,204 82,651 129,090  
Volta   58,630 53,868 47,577 48,286 49,978 72,858 97,064 93,887 97,857 84,922  
Western   86,520 85,480 72,135 73,210 75,406 77,553 79,021 74,191 71,285 82,825  

Data version 2.19.3

Contextual data

Collected data

Values obtained from primary and secondary sources

Approximated data

Values approximated based on other data for same location

–No data

Not applicable or no data available

LGB Larger Grain Borer (Prostephanus truncatus) read more ›

Storage beetle pest of maize and dried cassava

Contextual data

Contextual factors relate to local conditions and practices that may affect losses on a seasonal or annual basis, such as weather, pest incidence, grain drying conditions and the length of household-level storage.

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APHLIS network and team members collect this data from official sources (e.g. ministries of agriculture and statistics offices), published research studies and national surveys etc, or by interviewing farmers, extension workers or other key informants. This data enables APHLIS to apply the relevant loss figures from the PHL profiles depending on seasonal circumstances, and convert percentage losses into absolute losses (in tonnes) using the production figures. Based on the postharvest loss profiles and contextual factors, APHLIS estimates postharvest losses at the provincial, national and regional levels.

The contextual dataset includes production quantities (t), whether it rained at harvest, the percentage of the crop marketed during first 3 months after harvest, household-level storage duration, and presence of specific pests (for example the larger grain borer, LGB, Prostephanus truncatus) which are used to contextualise the loss profile for each year. The importance of different types of contextual factors may vary between crops, and data for the most relevant contextual factors is shown and used in the loss estimate calculations.

For specific crop, location, year combinations where contextual data is not available, approximated data has been used. This is calculated based on the contextualised data which has been provided for the same location. Approximated contextual data is shown in grey. 

Read more about how APHLIS estimates losses ›

Contextual factors

Production quantity (t) the quantity of grain produced on small and large farms for each growing season.

Rain at harvest whether or not there is damp weather at time of harvest which would make drying the grain difficult. If there is rain at harvest then the value for the harvesting link in the PHL profile is increased.

% sold during first 3 months the proportion of grain that is marketed within the first three months, i.e. that will not enter farm storage for any significant time. This proportion of the production will not be subject to farm storage losses but instead will be affected by transport and market storage losses.

Household-level storage duration (months) the length of time that grain was stored at household-level. If household-level storage is less than 3 months then household-level storage loss is reduced to 0%, if 3 to 6 months it will be only 50% of the loss profile figure, or if 6 months or more than 100% of the household-level storage loss is applied.

LGB presence in the case of maize, whether or not LGB (the larger grain borer, Prostephanus truncatus) is expected to be a significant pest. If LGB is a serious pest in that particular season then storage losses are multiplied by 2.

Season

In locations where there is more than one growing season each year, seasonal production data for each of the growing seasons is inputted. These are labelled as first, second, third season.

Farm type

In locations where there are both smallholder farms and large-scale commercial farms, the contextual data is shown for each of these types.

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