ISO 6181:2023 PDF

Scope: This document specifies general requirements, analytical methods, sampling and preparation of test sample, marking and labelling, packaging, transport and storage for liquid methylene-urea slow release fertilizers. This document applies to pure liquid slow release fertilizers, i.e. methylene urea (MU). This document does not apply to mixtures of nitrogenous fertilizers containing liquid slow release fertilizers.

ISO 6181:2023 Referenced Document

ISO 14820-1 Fertilizers and liming materials - Sampling and sample preparation - Part 1: Sampling
ISO 14820-2 Fertilizers and liming materials - Sampling and sample preparation - Part 2: Sample preparation
ISO 15604 Fertilizers - Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen
ISO 18643 Fertilizers and soil conditioners - Determination of biuret content of urea-based fertilizers - HPLC method
ISO 18645 Fertilizers and soil conditioners - Water soluble fertilizer - General requirements
ISO 19746 Determination of urea content in urea-based fertilizers by high performance liquid chromatography (HPLC)
ISO 5315 Fertilizers; Determination of total nitrogen content; Titrimetric method after distillation

2023 ISO 6181:2023 Fertilizers and soil conditioners — Liquid methylene-urea slow release fertilizers — General requirements