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Recommendation system by: Government


The program was developed by a consortium of the Institute of Soil Science and Plant Cultivation, the National Agricultural Chemical Station and the Institute of Technology and Life Sciences. On the basis of the predicted, average yield for given soil conditions, the uptake of nutrients is determined. Take into account the content of P, K, Mg and pH in the soil (additionally S and microelements: B, Cu, Fe, Zn, Mn, Mo). Nitrogen is calculated using the balance method (it is acceptable to determine mineral nitrogen in the soil up to 60 cm in early spring - as a reserve from the previous year). The balance takes into account the after-effect of manure and plowed crop residues and legumes, as well as natural reserves of assimilable nitrogen, depending on the clay content in the soil.

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Publisher Government
Name InterNaw
Countries covered Poland
Regions covered Whole country
Language Polish

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

Crops for Nitrogen Recommendation Wheat
Nitrogen Analysis Options Early spring 0-60 cm soil mineral N
Soil Nitrogen Assess Method Estimated
Factors for estimated Soil Mineral N Soil type, Previous manure/fertilization, Plowed pre-crop residues, Planted leguminous, Soil type clay content
Soil Nitrogen content measurement extract solution 2% K2SO4;
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 Mehlich 3;Egner-Riehm;NIR;
Crops for Potassium Recommendation Maize, Potatoes, Wheat
Soil Potassium content measurement Lab based analysis
Lab analysis method for Potassium Mehlich 3;NIR;Egner-Riehm in calcium lactate solution;
Potassium Sampling Frequency Every 3-4 years
Potassium Measurement Method None
Soil available Potassium(Κ) from potash clays Both soil tests and soil type

Guidance for minimizing nitrate leaching Provided
Crops for which the recommended N rate is adapted depending upon nitrate leaching risk -

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;
Spring Crop P content Not Accounted for
Accepted methods for assessment of spring crop P content
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 Current crop, Whole rotation
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, Rotation approach
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, Maize, Potatoes
Adjustments for Potato Recommendations
Recommendations on length of growing season, variety, haulm length and/or determinacy groups Available
Available adjustments for potatoes Planting date;Effect of irrigation;Problems with previous potato crops; Differences in fertilization depend on the length of vegetation (early-late), type of production (edible-industrial), the use or not of manure

Adjustments for nitrate leaching, gaseous N-losses and Ammonia Mitigation
N adjustments to account for gaseous N-losses are included for Manufactured fertilisers
Fertiliser types and additives change recommendation Urea
Ammonia mitigation strategies used for manufactured fertilisers Use of inhibitors
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), Digestate, Compost
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 None

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 Not 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) Usually 3-4 applications: before sowing, early spring, blade shooting's, on ear (1 or 2)
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 Wheat, Maize, Potatoes