1、Heavy metals concentrations in commercial organic fertilizers and the

China should formulate appropriate standards for the limits of Cu, Zn, and Ni in organic fertilizer as soon as possible and should pay great attention to heavy metal pollution of soils.

2、SUIP #25

Multiply the sum of the guaranteed percentages of all micro-nutrients (as defined by AAPFCO's Official Fertilizer Term, T-9) in the product by the value in the appropriate column in the Table to obtain the maximum allowable concentration (ppm) of each metal.

3、Cd content in phosphate fertilizer: Which potential risk for the

Meanwhile, the new EU Regulation on CAP Strategic Plans explicitly references soil health and fertility protection and the limitation of contaminants in fertilizers. Fertilizers with low Cd content, with thresholds no higher than 20 mg kg −1 P 2 O 5, would effectively limit bioaccumulation.

4、Maximum allowable concentrations of heavy metals in phosphate and

Download scientific diagram | Maximum allowable concentrations of heavy metals in phosphate and micronutrient fertilizers.

Heavy metals in fertilizers and effect of the fertilization on heavy

This paper systematically reviewed the status of heavy metal contents in chemical fertilizers and manures, and effects of the fertilizers application on heavy metal accumulation in soils and crops.

NUTRIENT TOLERANCES

In Europe, EU (European Union) has agreed to use same tolerances in all fertilisers which are sold as EU fertiliser. The nutrient content of the EC fertilisers must comply with the tolerance margins set forth below, in accordance with (EC) regulation No. 2003/2003, Article 13 (Annex II).

Heavy metals concentrations in commercial organic fertilizers and the

Inductively coupled plasma mass spectrometry (ICP-MS) was used to detect heavy metals in 74 typical and representative commercial organic fertilizers (COFs) collected in major COF production areas in China. The potential risk of fertilization into ...

Heavy metals concentrations in commercial organic fertilizers and the

Estimated by applying 3854 kg hectare− 1 (dry bass) of fertilizer per hectare per year, to guarantee the safe use of organic fertilizer, the risk monitoring of Cd in soil should be emphasized.

Maximum Safe Rates of Fertilizers – Field Crop News

Certain crops can tolerate higher rates of fertilizer without damage, and all crops are able to tolerate much higher rates of fertilizer with adequate soil moisture.

Maximum concentrations (mg/kg) of heavy metals allowed in organic

Maximum concentrations (mg/kg) of heavy metals allowed in organic fertilizers, soil and plants in Brazil, the EU and the USA. [...]

Fertilizers are indispensable in agricultural production, providing essential nutrients such as nitrogen (N), phosphorus (P₂O₅), and potassium (K₂O) to enhance crop yield and quality. With advancements in technology, fertilizer production processes have continuously improved, leading to higher maximum nutrient concentrations.

1. Nitrogen Fertilizers: As the most critical type of fertilizer, nitrogen fertilizers supply plants with nitrogen, which is vital for growth. Common nitrogen fertilizers include urea, ammonium nitrate, and ammonium sulfate. Urea, one of the most widely used, has a maximum nitrogen content of around 56% (N). Higher-concentration options, such as 58% (N) or 60% (N), are designed for rapid crop growth.

2. Phosphate Fertilizers: These fertilizers provide phosphorus to promote root development and fruit/flower formation. Examples include diammonium phosphate, triple superphosphate, and calcium-magnesium phosphate. Diammonium phosphate, a mainstream choice, reaches up to 46% (P₂O₅). Advanced formulations with 48% (P₂O₅) or 50% (P₂O₅) are used for accelerated growth.

3. Potassium Fertilizers: Potassium fertilizers strengthen disease resistance and improve crop quality. Common types include potassium chloride, potassium sulfate, and potassium nitrate. Potassium chloride, a widely adopted option, contains up to 50% (K₂O). Higher-concentration variants, such as 52% (K₂O) or 54% (K₂O), are employed for rapid nutrient delivery.

4. Compound Fertilizers: These contain two or more nutrients. Popular formulations include urea-diammonium phosphate, urea-ammonium nitrate, and urea-potassium chloride blends. The urea-diammonium phosphate compound, for example, may reach 56% (N) + 46% (P₂O₅) + 16% (K₂O), optimized for swift crop development.

5. Organic Fertilizers: Derived from animal, plant, or microbial wastes and treated safely, organic fertilizers offer balanced nutrition, improve soil structure, and boost fertility. their lower nutrient content often requires supplementation with chemical fertilizers. Common types include compost, green manure, and biogas fertilizers. Compost, a prevalent option, can achieve 45% (N) + 50% (P₂O₅) + 30% (K₂O), with high-concentration versions like 47% (N) + 52% (P₂O₅) + 33% (K₂O) available for rapid growth.

technological progress has driven higher nutrient concentrations in fertilizers. Advanced production techniques and equipment have enhanced efficiency and product quality. Additionally, strict government regulations ensure compliance with national standards, guaranteeing the safety and efficacy of fertilizers.