Adjusting Crop Fertilization Levels Based on the Cultivated Variety
1. Presentation
Characterization of the technique
Description of the technique:
| François Dumoulin | CA 60 | francois.dumoulin(at)agri60.fr | Fresnoy le Luat (60) |
|---|---|---|---|
| Rémy Ballot | INRA | remy.ballot(at)grignon.inra.fr | Grignon (78) |
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Define a forecast nitrogen fertilization dose using the balance method by taking into account the unit needs (coefficient "small b") of the cultivated variety.
Example of implementation:
When calculating the forecast nitrogen dose for a crop, the unit needs of each variety must be considered; from 2.7 to 3.6 u/q depending on the variety of soft wheat, from 3.7 to 4.1 depending on the variety of durum wheat. This implies taking the variety into account in defining the yield target to calculate the crop needs.
Implementation period On established crop
Spatial scale of implementation Plot
Application of the technique to...
All crops: Not generalizable
Unit needs are differentiated according to variety only for major crops: soft wheat, durum wheat…
All soil types: Easily generalizable
All climatic contexts: Easily generalizable
Regulation
2. Services provided by the technique
3. Effects on the sustainability of the cropping system
"Environmental" criteria
Effect on air quality: Increasing
GHG emissions: DECREASE
Effect on water quality: Increasing
N.P.: DECREASE
Effect on fossil resource consumption: Decreasing
Fossil energy consumption: DECREASE
Other: No effect (neutral)
Air: Taking variety into account in the forecast dose calculation helps limit greenhouse gas emissions related to the manufacture of mineral fertilizers applied in excess and nitrous oxide emissions in the field.
Water: Taking variety into account in the forecast dose calculation helps limit risks of over-fertilization, and thus nitrogen transfer risks to water by leaching.
Fossil energy: Taking variety into account in the forecast dose calculation helps limit fossil energy consumption related to the manufacture of mineral fertilizers applied in excess.
"Agronomic" criteria
Productivity: No effect (neutral)
For varieties with high unit needs, taking these elements into account in the forecast dose calculation helps limit risks of yield and quality losses due to nitrogen deficiency.
Soil fertility: No effect (neutral)
Water stress: Decreasing
Excess fertilization that maintains a large vegetative mass beyond what is necessary tends to sensitize cereals to water stress.
Functional Biodiversity: No effect (neutral)
Other agronomic criteria: Decreasing
Risk of diseases, lodging, insects: Decrease
Adjusting nitrogen fertilization by taking into account the unit needs of the variety helps reduce the risk of diseases, lodging or insects linked to excessive fertilization.
"Economic" criteria
Operational costs: Variable
Taking variety into account can lead to increasing or decreasing the forecast dose, thus fertilization costs.
Mechanization costs: No effect (neutral)
Margin: Increasing
Taking variety into account helps maximize the economic efficiency of nitrogen fertilization, thus improving crop margin.
Other economic criteria: No effect (neutral)
Fuel consumption: no effect (neutral)
"Social" criteria
Working time: No effect (neutral)
Observation time: No effect (neutral)
4. Organisms favored or disadvantaged
Favored Bioagressors
| Organism | Impact of the technique | Type | Details |
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Disadvantaged Bioagressors
| Organism | Impact of the technique | Type | Details |
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Favored Auxiliaries
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Disadvantaged Auxiliaries
| Organism | Impact of the technique | Type | Details |
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Favored climatic and physiological accidents
| Organism | Impact of the technique | Details |
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Disadvantaged climatic and physiological accidents
| Organism | Impact of the technique | Details |
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5. For further information
- Nitrogen balance - Unit needs of new varieties of soft wheat
- -Le Souder C., Blondlot A. (Arvalis)
Perspectives agricoles n°321, p50-51, Press article, 2006
Brochure reserved for subscribers
- Calculation of nitrogen fertilization - Methodological guide for establishing local prescriptions
- -Comifer
Technical brochure, 2011
6. Keywords
Bioagressor control method:
Mode of action:
Type of strategy regarding pesticide use:
