AgriStats Manual – MC Edition.pdf - International Plant Nutrition ...
AgriStats Manual – MC Edition.pdf - International Plant Nutrition ...
AgriStats Manual – MC Edition.pdf - International Plant Nutrition ...
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<strong>AgriStats</strong> <strong>Manual</strong> <strong>–</strong> <strong>MC</strong> <strong>Edition</strong><br />
• Exploitable Gap (Ya - Y), defined as the difference between Attainable Yield and Actual Yield,<br />
this portion of yield (kg/ha) is limited by advancements in knowledge and technologies,<br />
including adoption rate, that are expected to be surpassed.<br />
• Remaining Gap (Yp - Ya), defined as the difference between Potential Yield and Attainable Yield,<br />
this portion of yield (kg/ha) is limited by unfavorable economics (high inputs required following<br />
the law of diminishing return), high risks of crop failure (increasing pest and disease pressure,<br />
crop lodging, etc.), environmental limitations to high yield including water availability and poor<br />
soil productivity, or unforeseen advances in crop production technology.<br />
• Full Gap (Yp - Y), defined as the difference between Potential Yield and Actual Yield, this portion<br />
of yield (kg/ha) is the sum of the exploitable and remaining Yield Gaps.<br />
Current Nutrient Use: Crop-wise fertilizer consumption and nutrient removal which considers both the<br />
harvested product and an estimate of crop residue removal from the field. Nutrient removal to use<br />
ratios are also provided. Sources: FAO and Government websites.<br />
• Fertilizer Use (FC), Crop-wise fertilizer (N, P 2 O 5 , K 2 O, S, MgO) consumption (t).<br />
• Nutrient Removal (NR), Crop nutrients (N, P 2 O 5 , K 2 O, S, MgO) removed within harvested<br />
products from crops receiving fertilizer and, where applicable, quantities of crop residues<br />
commonly removed from field (t).<br />
• Nutrient Removal-to-Use Ratio (NR/FC), Nutrient Removal/Fertilizer Use<br />
Attainable Nutrient Use: Crop-wise fertilizer consumption and nutrient removal which considers both<br />
the harvested product from attainable yields and an estimate of crop residue removal from the field.<br />
Nutrient removal to use ratios are also provided. Sources: IPNI Staff, FAO and Government websites.<br />
• Fertilizer Use (FCa), Crop-wise fertilizer (N, P 2 O 5 , K 2 O, S, MgO) consumption (t).<br />
• Nutrient Removal (NRa), Crop nutrients (N, P 2 O 5 , K 2 O, S, MgO) removed within harvested<br />
products from crops receiving fertilizer and, where applicable, quantities of crop residues<br />
commonly removed from field (t).<br />
• Nutrient Removal-to-Use Ratio (NRa/FCa), Nutrient Removal/Fertilizer Use<br />
Current Fertilizer Use: Estimates of the scope and intensity of current average fertilization practices and<br />
the resulting fertilizer consumption. Sources: IPNI expert knowledge.<br />
• Current Fertilizer Use (FX), Average N, P 2 O 5 , K 2 O, S, MgO application rates (kg/ha) which<br />
correspond to the crop area that receives fertilizer.<br />
• Current Fertilized Area (AF), Estimated crop area (%) currently receiving fertilizer.<br />
• Current Fertilizer Consumption (FC), Crop-wise fertilizer (N, P 2 O 5 , K 2 O, S, MgO) consumption (t).<br />
Attainable Fertilizer Use: Estimates of the scope and intensity of crop fertilization required for<br />
attainable yield estimates and the resulting fertilizer consumption. Sources: IPNI expert knowledge.<br />
• Attainable Fertilizer Use (FXa), Estimates of N, P 2 O 5 , K 2 O, S, MgO application rates (kg/ha) which<br />
correspond to those suited for attainable yield levels.<br />
17 | P age
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