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Management zone-specific N mineralization rate estimation in unamended soil

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Abstract

An ideal and efficient nitrogen (N) recommendation for precision fertilization (PF) should account for potential soil mineralizable N. This study aimed at estimating management zone (MZ) specific soil N mineralization rate (SNMR) of unamended soils. A total of 76 soil samples were collected from 21 MZs across 5 fields. An aerobic laboratory incubation was conducted under controlled conditions for two months with seven sub-sampling events. N mineralization was assessed as net increase in soil mineral N over time. Results indicated a considerable variation in mineralized soil N (9.12–41.93 mg kg−1 soil) across fields. Highest and lowest net SNMRs were 0.50 and 0.0004 mg kg−1 soil day−1, respectively. SNMRs significantly differed across MZs in three fields, while in the other two fields no significant differences were observed. In turn, 3 of 34 MZ-pairs differed (marginally) significantly (padj = 0.02–0.09) from one another, namely in MZ pairs with high variation in soil particle sizes. MZ-specific SNMRs were mostly positively correlated to pH (0.20–1.00), total N (0.12–0.99), soil mineral N (0.11–1.00) and sand (0.34–0.99), negatively correlated with clay (− 1.00 to − 0.11) and correlations with SOC were mixed (0.41 to − 0.62). This along with the support from regression analysis corroborated the existing knowledge that TN is a better predictor of mineralization than SOC. While there were only few statistically significant differences in SNMR amongst MZ per field despite mathematical differences, still incorporating MZ-specific SNMR in management decisions will be crucial in optimizing the N use efficiency in precision farming, and along with other management actions, lead to more environmentally friendly PF schemes.

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Data availability

The data that has been used is confidential.

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Acknowledgements

Authors acknowledge the financial support received from the Research Foundation—Flanders (FWO) for Odysseus I SiTeMan Project (Nr. G0F9216N).

Funding

Funding was provided by Vlaamse Overheid (G0F9216N).

Author information

Authors and Affiliations

Authors

Contributions

FYR: conceptualization, methodology, software, validation, formal analysis, investigation, data curation, visualization, writing—original draft; MAM: formal analysis, visualization, writing—review & editing; SDN: methodology, writing—review & editing, supervision; AMM: conceptualization, writing—review & editing, supervision, funding acquisition, project administration.

Corresponding author

Correspondence to Abdul Mounem Mouazen.

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Appendices

Appendix 1:Soil N mineralization data across the fields.

figure a
figure b
figure c
figure d
figure e

Appendix 2:Analysis of variance soil N mineralization rate across management zones.

Fields

ANOVA

Duncan’s PostHoc Test

 

Sources

DF

SS

MS

Fvalue

pvalue

Source

MD

CI

padj

Dal

MZ

3

0.031

0.010

1.173

0.373

MZ 3–2

− 0.129

− 0.315 to 0.058

0.153

Residuals

9

0.080

0.009

  

MZ 4–2

− 0.113

− 0.284 to 0.057

0.168

      

MZ 1–2

− 0.103

− 0.278 to 0.071

0.213

      

MZ 4–3

0.015

− 0.148 to 0.179

0.835

      

MZ 1–3

0.025

− 0.157 to 0.207

0.762

      

MZ 1–4

0.009

− 0.154 to 0.173

0.895

Gingelomse

MZ

3

0.036

0.012

1.923

0.190

MZ 4–2

− 0.096

− 0.226 to 0.033

0.129

Residuals

10

0.062

0.006

  

MZ 3–2

− 0.136

− 0.279 to 0.008

0.061

      

MZ 1–2

− 0.060

− 0.194 to 0.073

0.339

      

MZ 3–4

− 0.039

− 0.173 to 0.094

0.526

      

MZ 1–4

0.036

− 0.098 to 0.169

0.562

      

MZ 1–3

0.075

− 0.074 to 0.225

0.288

Grootland

MZ

3

0.104

0.034

2.713

0.096

MZ 4–3

− 0.130

− 0.329 to 0.068

0.177

Residuals

11

0.140

0.013

  

MZ 2–3

− 0.038

− 0.241 to 0.165

0.686

      

MZ 1–3

0.083

− 0.098 to 0.264

0.335

      

MZ 2–4

0.092

− 0.098 to 0.281

0.308

      

MZ 1–4

0.213

0.035 to 0.392

0.023

      

MZ 1–2

0.121

− 0.068 to 0.311

0.188

Kroky

MZ

4

0.039

0.009

1.211

0.347

MZ 4–2

0.126

− 0.045 to 0.296

0.139

Residuals

15

0.124

0.008

  

MZ 3–2

0.112

− 0.037 to 0.259

0.131

      

MZ 5–2

0.072

− 0.076 to 0.219

0.316

      

MZ 1–2

0.131

− 0.024 to 0.287

0.092

      

MZ 3–4

− 0.014

− 0.156 to 0.127

0.835

      

MZ 5–4

− 0.054

− 0.209 to 0.101

0.476

      

MZ 1–4

0.006

− 0.136 to 0.147

0.932

      

MZ 5–3

− 0.039

− 0.169 to 0.090

0.527

      

MZ 1–3

0.019

− 0.109 to 0.148

0.748

      

MZ 1–5

0.059

− 0.081 to 0.199

0.384

Fabrieke

MZ

3

0.002

0.001

0.477

0.705

MZ 3–2

0.001

− 0.067 to 0.069

0.986

Residuals

10

0.014

0.001

  

MZ 1–2

0.025

− 0.042 to 0.091

0.431

      

MZ 4–2

− 0.004

− 0.068 to 0.059

0.883

      

MZ 1–3

0.024

− 0.039 to 0.088

0.421

      

MZ 4–3

− 0.005

− 0.071 to 0.062

0.873

      

MZ 4–1

− 0.029

− 0.092 to 0.034

0.332

  1. ANOVA analysis of variance; DF degrees of freedom; SS sum of square; MS mean square; MD mean differences; CI confidence interval; MZ management zone
  2. Significant codes: “***” 0.001 “**” 0.01 “*” 0.05 “.” 0.1 “” 1 and significant values are highlighted in bold

The following box plot is the representation of significance of variance of N mineralization rate for all fields.

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Ruma, F.Y., Munnaf, M.A., De Neve, S. et al. Management zone-specific N mineralization rate estimation in unamended soil. Precision Agric 24, 1906–1931 (2023). https://doi.org/10.1007/s11119-023-10023-x

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