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338 | IAASTD Global Report
Table 5-16. Assumptions for high/low agricultural investment variants.
Parameter changes for growth rates |
2050 REFERENCE RUN |
2050 High AKST variant (#1) |
2050 Low AKST variant (#2) |
GDP growth |
3.06 % per year |
3.31 % per year |
2.86 % per year |
Livestock numbers and yield growth |
Base model output numbers growth 2000-2050 Livestock: 0.74%/yr Milk: 0.29%/yr |
Increase in numbers growth of animals slaughtered by 20% Increase in animal yield by 20% |
Reduction in numbers growth of animals slaughtered by 20% Reduction in animal yield by 20% |
Food crop yield growth |
Base model output yield growth rates 2000-2050: Cereals: %/yr: 1.02 R&T: %/yr: 0.35 Soybean: %/yr 0.36 Vegetables: %/yr 0.80 Sup-tropical/tropical fruits: 0.82%/yr |
Increase yield growth by 40% for cereals, R&T, soybean, vegetables, ST fruits & sugarcane, dryland crops, cotton Increase production growth of oils, meals by 40% |
Reduce yield growth by 40% for cereals, R&T, soybean, vegetables, fruits & sugarcane, dryland crops, cotton Reduce production growth of oils, meals by 40% |
Source: Authors.
Table 5-17. Assumptions for high/low agricultural investment combined with high/low Investment in other AKST-related factors
(irrigation, clean water, water management, rural roads, and education).
Parameter changes for growth rates |
2050 BASE |
2050 High AKST combined with other services (#3) |
2050 Low AKST combined with other services Low (#4) |
GDP growth |
3.06 % per year |
3.31 % per year |
2.86 % per year |
Livestock numbers growth |
Base model output numbers growth 2000-2050 Livestock: 0.74%/yr Milk: 0.29%/yr |
Increase in numbers growth of animals slaughtered by 30% Increase in animal yield by 30% |
Reduction in numbers growth of animals slaughtered by 30% Reduction in animal yield by 30% |
Food crop yield growth |
Base model output yield growth rates 2000-2050: Cereals: %/yr: 1.02 R&T: %/yr: 0.35 Soybean: %/yr 0.36 Vegetables: %/yr 0.80 Sup-tropical/tropical fruits: 0.82%/yr |
Increase yield growth by 60% for cereals, R&T, soybean, vegetables, ST fruits & sugarcane, dryland crops, cotton Increase production growth of oils, meals by 60% |
Reduce yield growth by 60% for cereals, R&T, soybean, vegetables, fruits & sugarcane, dryland crops, cotton Increase production growth of oils, meals by 60% |
Irrigated area growth (apply to all crops) |
0.06 |
Increase by 25% |
Reduction by 25% |
Rain-fed area growth (apply to all crops) |
0.18 |
Decrease by 15% |
Increase by 15% |
Basin efficiency |
|
Increase by 0.15 by 2050, constant rate of improvement overtime |
Reduce by 0.15 by 2050, constant rate of decline over time |
Access to water |
|
Increase annual rate of improvement by 50% relative to baseline level, (subject to 100 % maximum) |
Decrease annual rate of improvement by 50% relative to baseline level, constant rate of change over time |
Female secondary education |
|
Increase overall improvement by 50% relative to 2050 baseline level, constant rate of change over time unless baseline implies greater (subject to 100 % maximum) |
Decrease overall improvement by 50% relative to 2050 baseline level, constant rate of change over time unless baseline implies less |
Source: Authors.
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