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Recommendation system by: Levy board

Nutrient Management Guide (RB209)

RB209 offers best practice guidance on the application of mineral fertilisers, manures and slurries to crops and grassland. It helps farmers make the most of organic materials and balance the benefits of fertiliser use against the costs – both economic and environmental. The guide outlines the value of nutrients and soil and explains how good nutrient management can save money and infer improved environmental outcomes. The guide aims to increase uptake and accuracy of crop nutrient management planning.

Access the recommendation system

Wheat
Maize
Potatoes
Nitrogen
Phosphorus
Potassium

Publisher Levy board
Name Nutrient Management Guide (RB209)
Weblink https://ahdb.org.uk/rb209
Countries covered United Kingdom
Regions covered England, Wales, Northern Ireland
Language English

Crops covered Wheat, Maize, Potatoes, Vegetables, Other cereals, Brassicas, Other crops
Nutrients covered Nitrogen (N), Phosphorus (P), Potassium (K), Sulphur (S), Magnesium (Mg), Boron (B), Copper (Cu), Manganese (Mn), Molybdenum (Mo), Zinc (Zn)
Target soil pH Recommendations based on soil and cropping types Provided

Nitrogen
Crops for Nitrogen Recommendation Maize, Potatoes, Wheat
Nitrogen Analysis Options Soil Mineral Nitrogen
Soil Nitrogen Assess Method Estimated
Factors for estimated Soil Mineral N Soil type, Rainfall, Past management, Previous crop
Soil Nitrogen content measurement Extraction with KCl;Potentially available N (AN) or anaerobic mineralisable N (AMN);
Phosphorus
Crops for Phosphorus Recommendation Maize, Potatoes, Wheat
Soil Phosphorus content measurement Lab based method
Phosphorus Sampling Frequency Every 3-4 years
Lab analysis method for Phosphorus Olsen P method;
Potassium
Crops for Potassium Recommendation Maize, Potatoes, Wheat
Soil Potassium content measurement Lab based analysis
Lab analysis method for Potassium Ammonium nitrate extraction;
Potassium Sampling Frequency Every 3-4 years
Potassium Measurement Method None
Soil available Potassium(Κ) from potash clays Soil type

Guidance for minimizing nitrate leaching Provided
Crops for which the recommended N rate is adapted depending upon nitrate leaching risk None

Nitrogen
Dry Springs Not Considered
Advice on irrigation for N recommendation Not Provided
Spring Crop N content Accounted for
Accepted methods for assessment of spring crop N content Lab analysis;Shoot number;
Phosphorus
Spring Crop P content Not Accounted for
Accepted methods for assessment of spring crop P content
Nitrogen
Current in season crop N requirement Estimated
Basis for N Requirement Estimation Standard values for crop N content
Expected yields Estimated in season N requirement can be adjusted for expected yields
Basis of crop N requirements Crop approach
Phosphorus
Current in season crop P requirement Estimated
Basis for P requirement estimation Standard values for crop P content
Expected yields Estimated P requirement can be adjusted for expected yields
Basis of crop P requirements Crop approach
Potassium
Current in season crop K requirement Estimated
Basis for K requirement estimation Standard Yield
Expected yields Estimated K requirement can be adjusted for expected yields
Crops for which yield adjustments are made Wheat
Adjustments for Potato Recommendations
Recommendations on length of growing season, variety, haulm length and/or determinacy groups Available
Available adjustments for potatoes Planting date;Cold soils;Timing of N application;Effect of irrigation;Placement of N in bed systems;Problems with previous potato crops; If crops are planted late but the defoliation date remains unaltered, this will reduce the length of the growing season, which will justify a reduction in N rate For determinate crops planted into cold soils and where emergence is delayed but the intended season length remains the same, consider increasing the amount of N applied by 15–20 kg N/ha. If top dressing is planned, apply 2/3 of the N recommendation in the seedbed and the remainder shortly after emergence rather than just in the seed bed. N rates could be reduced by 15–20 kg N/ha in rain-fed, determinate crops. Where fertiliser application methods reduce the amount of N falling into furrow bottoms (e.g. placement or banded applications), reductions could be considered. If previous crops have had problems with excessive canopy production and were defoliated at complete ground cover, reduce the N rate. If there have been problems with delayed skin-set, consider reducing the N rate towards the lower end of the recommended range.

Adjustments for nitrate leaching, gaseous N-losses and Ammonia Mitigation
N adjustments to account for gaseous N-losses are included for Manures
Fertiliser types and additives change recommendation
Ammonia mitigation strategies used for manufactured fertilisers
Manure application methods used for reducing ammonia emissions Precision application equipment (e.g. bandspreading);Incorporation into soil;
Organic materials nutrient content
Crop available N for different types of organic material Calculated
Organic materials for which crop available N is calculated Farmyard manure (cattle, goat, pig, sheep, horse, duck), Cattle slurry, Pig slurry, Poultry manure, Digestate, Compost, Biosolids, Waste derived materials e.g. paper crumble, food waste
Crop available nutrients from organic materials accounted for Nitrogen (N), Phosphorus (P), Potassium (K)
Nutrients for which there is an option to input own organic material nutrient analysis Nitrogen (N), Phosphorus (P), Potassium (K)
Types of organic materials for which regulation stipulates a sampling requirement Certain types

Guidance on fertilizer application timings Provided, Adjusted for the total amount of nutrient applied
Guidance on the rate of fertiliser to apply at each timing Provided
Number of fertilizer N applications in wheat 3
Application number between maize and potatoes Different
Number of fertiliser N applications in maize (or potatoes) Maize - 2 applications. Up to 10–15 kg/ha of the nitrogen requirement may be placed below the seed at drilling. The remainder of the nitrogen requirement should be top-dressed as soon as the crop has emerged. Potatoes: 1 application with all N being applied in the seedbed. Unless the crop is grown on light sand and shallow soils, then apply about two thirds of the nitrogen recommendation in the seedbed and the remainder shortly after emergence. Aim to apply all the nitrogen by the time of tuber initiation
P & K application frequency in winter wheat Once a year
P & K application frequency between maize and potatoes Does not differ
P & K application frequency in maize (or potatoes)
Crops with guidance available for the placement of fertilisers Maize, Potatoes
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