Fertilizer recommendations for Fertilizer recommendations for field crops in Croatiafield crops in Croatia

Ph. D. Zdenko Loncaric, Faculty of Agriculture, Ph. D. Zdenko Loncaric, Faculty of Agriculture, Department of AgroecologyDepartment of Agroecology

Osijek, Republic of CroatiaOsijek, Republic of Croatia

Faculty of AgricultureFaculty of AgricultureDepartment of AgroecologyDepartment of Agroecology

Work objects due to achieve high yield, good Work objects due to achieve high yield, good quality and to preserve ecosystem:quality and to preserve ecosystem:

1 A1 A fertilization field researches fertilization field researches1 B1 B soil analyses improvement (lab soil analyses improvement (lab researches)researches)22 soil analyses - database soil analyses - database33 fertilizer recommendations fertilizer recommendations

Fertilization field researchesFertilization field researches

sites: sites: 10 different locations in eastern Croatia10 different locations in eastern Croatia

crops:crops: maize, wheat, sugar beet, alfalfa, maize, wheat, sugar beet, alfalfa, pepperpepper

topics:topics: liming, phosphorus, nitrogen, zinc, liming, phosphorus, nitrogen, zinc, boronboron

specific:specific: two sites with 15 lysimeters, pot exp. two sites with 15 lysimeters, pot exp.

aim:aim: control of yield, quality, soil nutrient control of yield, quality, soil nutrient statusstatus

Soil analyses improvementSoil analyses improvement

1A fertilization field researches1A fertilization field researches

1B1B soil analyses improvement soil analyses improvement2 soil analyses - database2 soil analyses - database

3 fertilizer recommendations3 fertilizer recommendations

Soil analyses improvementSoil analyses improvementsteps: steps:

1.1. common and additional soil sample common and additional soil sample analyses, analyses,

2.2. comparison of HRN, EN and other results,comparison of HRN, EN and other results,

3.3. creating new model for result creating new model for result interpretations, interpretations,

4.4. validation of existing modelsvalidation of existing models

models:models: P, N, liming materials, organic P, N, liming materials, organic fertilizerfertilizer

Model Example 1: Olsen-P & AL-PModel Example 1: Olsen-P & AL-P

initial BS range: < 50%

4

8

12

16

80% 90% 95% 99% 100%

t CaCO3 ha-1

4

8

12

16t CaCO3 ha-1

BS target pH target

6.0 6.5 6.7 6.9 7.0

1

2

34

5

Model Example 2: Liming recommendationsModel Example 2: Liming recommendations

to target BS: to target BS: Hy, CEC Hy, CEC (blue line on the graph)(blue line on the graph)to target pH: to target pH: pH, Hy pH, Hy (red line on the graph)(red line on the graph)

DatabaseDatabase

1A fertilization field researches1A fertilization field researches

1B soil analyses improvement (lab 1B soil analyses improvement (lab researches)researches)

22 soil analyses - database soil analyses - database3 fertilizer recommendations3 fertilizer recommendations

Fertilizer recommendationsFertilizer recommendations

1A fertilization field researches1A fertilization field researches

1B soil analyses improvement (lab 1B soil analyses improvement (lab researches)researches)

2 soil analyses - database2 soil analyses - database

33 fertilizer recommendations fertilizer recommendations

Calculator Example 1: AlgorithmCalculator Example 1: Algorithm

Producers and site data

Specific nutrient demands regardnig to crop

Site specific conditions related to mineralization

Fertilizer assortment

Fertilizer recommendation

Nutrient balance

MINERALIZATION

Fertilizer assortment

Fertilizer recommendation

Nutrient balanceData 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

SURVEY

DATA

MODEL

DATA

CEC Hy

Biogenity

Slope

Irigation

Agrotechnics

Protection

+ liming

mineralization

N application

balance

Example 1: Internet browser windowExample 1: Internet browser window

Example 2: Algorithm of DSS Example 2: Algorithm of DSS FFertilizer recommendations and economic ertilizer recommendations and economic analyses of organic field cropsanalyses of organic field crops productionproduction

Example 2: Visual Basic application

Part I – Soil suitability

Part II - Soil properties

Part III – Available Fertilizers

Part IV – Fertilizer Recommendation

Part V – Economic analyses

Thank you for

your attention!