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Sulfur Coated Urea, abbreviated as SCU, is also known as sulfur-coated urea or coated sulfur urea. By definition, it is a slow-release fertilizer that uses sulfur as the main coating material to coat granular urea, thereby achieving the slow release of nitrogen. This type of fertilizer belongs to the category of inorganic coated slow-release fertilizers. Its products usually have an additional coating of a sealing agent (generally accounting for 2% - 3% of the total weight) and a conditioning agent (also generally accounting for 2% - 3% of the total weight) outside the sulfur layer. Under normal circumstances, the nitrogen content of Sulfur Coated Urea ranges from 30% to 40%, and the sulfur content is not less than 8%.​

The chemical name of urea is carbamide, with the chemical formula CO(NH₂)₂. It has a nitrogen content as high as 46%, making it the solid nitrogen fertilizer with the highest nitrogen content. It is easily soluble in water. It is widely used in the cultivation of food crops, cash crops, and horticultural crops. Urea can not only quickly supplement the nitrogen required for plant growth, promote dark green leaves and robust plants, but also improve the photosynthesis efficiency of crops and enhance their stress resistance.

Potassium (K) is known as the "quality element" for plants, playing a crucial role in osmotic regulation, photosynthesis, sugar transportation, and protein synthesis. When soil K supply is insufficient or plant absorption is hindered, specific symptoms of K deficiency emerge in different crops, severely affecting yield and quality. This article systematically analyzes the typical manifestations, mechanisms, and integrated management strategies for K deficiency in crops, providing a scientific basis for precision fertilization in modern agriculture.

In the chemical industry, caprolactam - grade ammonium sulfate is a product of great application value. With its unique properties and wide range of uses, it plays a key role in many fields such as agriculture and industry, and has become an indispensable important raw material in the production process of many industries.

Phosphorus, known as the "bridge of energy transfer" in crop growth, plays a decisive role in cell division and yield formation. When plants show stunted growth or purple-tinged leaves, accurate diagnosis of phosphorus deficiency is crucial for scientific fertilization.

Nitrogen is often called the "energy source of plant life," playing a pivotal role in crop growth and development. When plants show signs of yellowing or stunted growth, accurately diagnosing nitrogen deficiency is the first step toward scientific fertilization. This article constructs a comprehensive diagnostic system from four dimensions: the physiological functions of nitrogen, the temporal-spatial patterns of deficiency symptoms, diagnostic techniques, and fertilization strategies, empowering agricultural producers with precise identification skills.​

Fertilizers are the material basis of agriculture, providing essential nutrients for crop growth. They are categorized into chemical fertilizers (inorganic) and organic fertilizers based on origin and production methods. Chemical fertilizers, synthesized through chemical processes or mineral processing, include nitrogen (N), phosphorus (P), potassium (K) fertilizers, and compound fertilizers. Their core advantages lie in high nutrient concentration and rapid effectiveness . Organic fertilizers, derived from decomposed animal manures, plant residues, and organic industrial byproducts (e.g., compost, green manure, biogas slurry), excel in holistic nutrition and soil improvement .