1. Fertilizer recommendations for field crops in Croatia Ph. D. Zdenko Loncaric, Faculty of Agriculture, Department of Agroecology Osijek, Republic of Croatia

2. Faculty of Agriculture Department of Agroecology Work objects due to achieve high yield, good quality and to preserve ecosystem: 1 A fertilization field researches 1 B soil analyses improvement (lab researches) 2 soil analyses - database 3 fertilizer recommendations

3. Fertilization field researches sites: 10 different locations in eastern Croatia crops: maize, wheat, sugar beet, alfalfa, pepper topics: liming, phosphorus, nitrogen, zinc, boron specific: two sites with 15 lysimeters, pot exp. aim: control of yield, quality, soil nutrient status

4. Soil analyses improvement 1A fertilization field researches 1B soil analyses improvement 2 soil analyses - database 3 fertilizer recommendations

5. Soil analyses improvement steps: 1.common and additional soil sample analyses, 2.comparison of HRN, EN and other results, 3.creating new model for result interpretations, 4.validation of existing models models: P, N, liming materials, organic fertilizer

6. Model Example 1: Olsen-P & AL-P

7. Model Example 2: Liming recommendations to target BS: Hy, CEC (blue line on the graph) to target pH: pH, Hy (red line on the graph)

8. Database 1A fertilization field researches 1B soil analyses improvement (lab researches) 2 soil analyses - database 3 fertilizer recommendations

9. Fertilizer recommendations 1A fertilization field researches 1B soil analyses improvement (lab researches) 2 soil analyses - database 3 fertilizer recommendations

10. Calculator Example 1: Algorithm

11. Producers and site data Specific nutrient demands regardnig to crop Site specific conditions related to mineralization Fertilizer assortment Fertilizer recommendation Nutrient balance MINERALIZATION

12. Fertilizer assortment Fertilizer recommendation Nutrient balance Data base and results Advices, directions, objections, suggestions Producers and site data Specific nutrient demands regardnig to crop Site specific conditions related to mineralization MINERALIZATION Additional analytical data SURVEYDATASURVEYDATA MODELDATAMODELDATA CEC Hy Biogenity Slope Irigation Agrotechnics Protection + liming mineralization N application balance

13. Example 1: Internet browser window

14. Example 2: Algorithm of DSS Fertilizer recommendations and economic analyses of organic field crops production

15. Example 2: Visual Basic application Part I – Soil suitability

16. Part II - Soil properties

17. Part III – Available Fertilizers

18. Part IV – Fertilizer Recommendation

19. Part V – Economic analyses

20. Thank you for your attention!