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January 2026 Release

· 3 min read
Sven Verweij
Sven Verweij
Project Manager @ NMI

The January 2026 release includes buffer strip support, updated grassland regulation logic, and the new "Bemestingsplan" PDF export. Key changes also include the integration of the BRO Soil Map and a refactor of the balance calculation engine to support field-level caching.

Compliance and Buffer Strips​

To expand our support for Dutch regulations, we have implemented explicit support for buffer strips across the calculator and application.

  • Buffer Strip Designation: Users can now explicitly mark fields as buffer strips.
    • Data Model: The derived b_isproductive parameter has been replaced with a stored b_bufferstrip parameter.
    • Migration: For existing fields, b_bufferstrip has been initialized based on previous logic.
  • Calculation Logic:
    • Farm Balances: Fields designated as buffer strips are excluded from farm-level Nitrogen and Organic Matter balance calculations.
    • Norms and Advice: The calculator sets nitrogen usage norms and nutrient advice to zero for buffer strips.
    • UI Updates: The application displays messages when calculations are omitted for these fields.
  • Grassland Regulations: Logic for nitrogen reduction (korting) regarding grassland renewal and destruction has been implemented for the 2025 and 2026 seasons.

Reporting and Data Export​

  • Bemestingsplan PDF: A new PDF export provides an overview of norms, advice, and fertilizer usage at both the farm and field levels.
  • Export cultivation history: A "Copy to Clipboard" button has been added to the Cultivation History view, enabling data export in CSV/TSV format.
  • Crop Rotation Table:
    • Expandable Rows: The table now supports expandable rows, showing specific fields associated with each cultivation.
    • Workflow Integration: Field selections in the rotation table are carried over to the harvest and fertilizer addition wizards.
  • Session Persistence: Filters applied to the field and rotation tables are now stored in session storage.

Atlas​

  • Soil Map Integration: The BRO "Bodemkaart" (Soil Map) is now integrated into the Atlas.
  • Bulk Addition: The Atlas now supports adding multiple fields simultaneously through the fields table interface for existing farms.

UI/UX and Mobile Improvements​

Several core components have been refactored to improve responsiveness and accessibility.

  • Responsive Layouts: The Field Overview, Header, Sidebar, and Fertilizer Dashboard have been updated for smaller screens and mobile devices.
  • Component Standardization: LoadingSpinner instances have been replaced with the standardized shadcn Spinner component.
  • Accessibility: Updates have been made to the Cookie Banner and error pages.
  • Input Validation: Harvest dates are now validated against sowing and cultivation dates before submission.

Technical Improvements​

  • Calculation Performance: Nitrogen and Organic Matter balance calculations have been refactored to use a bottom-up approach (Field -> Farm). This enables per-field caching, improving performance for farms with many fields.
  • Security and Authentication:
    • Organization Management: Organization-related functions have been migrated to use better-auth server-side capabilities.
    • Cache Privacy: The withCalculationCache function now supports redacting sensitive keys in the cache.
  • Type Safety: The FdmAuth type definition has been updated to correctly include plugin configurations and settings.
  • Documentation: Documentation for 2025 nitrogen usage norms has been updated to include rules for grassland renewal and destruction.

For a detailed list of changes, please refer to the package-specific changelogs for fdm-app, fdm-calculator, fdm-core, and fdm-data. Feedback and contributions are welcome on our GitHub repository.