{"id":20146,"date":"2026-06-29T11:40:44","date_gmt":"2026-06-29T11:40:44","guid":{"rendered":"https:\/\/alqawafel.com\/?p=20146"},"modified":"2026-06-29T11:45:45","modified_gmt":"2026-06-29T11:45:45","slug":"types-of-chemical-fertilizers","status":"publish","type":"post","link":"https:\/\/alqawafel.com\/zh\/types-of-chemical-fertilizers\/","title":{"rendered":"Types of Chemical Fertilizers: What Every Farmer Needs to Know"},"content":{"rendered":"

You might assume that chemical fertilizers are all essentially the same\u00a0 bags of numbers you don’t fully understand, mixed into the soil while you wait for results. But the truth is that every crop has its own nutritional language, and every growth stage has its own unique dietary formula. What benefits wheat at germination may damage tomatoes at flowering. What works for fruit trees may burn leafy vegetables.<\/span><\/p>\n

This confusion is exactly what drives many farmers to use chemical fertilizers randomly\u00a0 buying urea because a neighbor used it, or adding DAP because a supplier recommended it, without asking: is this fertilizer right for my soil? Is this the nutrient my crop actually needs right now? The result is almost always the same: a lower yield than expected, and soil that deteriorates with each passing season.<\/span><\/p>\n

At Al-Qawafel, we believe that a good fertilizer is not enough\u00a0 you need the right type, at the right time, in the right dose. This guide gives you a clear map of the types of chemical fertilizers, with decisive comparisons and practical selection criteria, built on 30 years of experience across 40 countries. By the end, you’ll know exactly which fertilizer delivers maximum yield without damaging your soil.<\/span><\/p>\n

What Are the Types of Chemical Fertilizers for Plants?<\/b><\/h3>\n

Chemical fertilizers are classified by the primary nutrient they supply to the plant. Each type plays a specific role in supporting growth and productivity.<\/span><\/p>\n

Nitrogen Fertilizers (Nitrate Fertilizers)<\/b><\/h4>\n

Nitrogen is the element of vegetative growth\u00a0 it is present in proteins and chlorophyll, giving the plant its deep green color and driving strong, vigorous growth.<\/span><\/p>\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/b><\/td>\nFormula<\/b><\/td>\nN Content<\/b><\/td>\nKey Characteristics<\/b><\/td>\n<\/tr>\n
Urea<\/span><\/td>\nCO(NH\u2082)\u2082<\/span><\/td>\n46%<\/span><\/td>\nMost economical per N unit; requires soil conversion; risk of volatilization in heat<\/span><\/td>\n<\/tr>\n
Ammonium nitrate<\/span><\/td>\nNH\u2084NO\u2083<\/span><\/td>\n33.5%<\/span><\/td>\nFast absorption; unstable and requires careful storage<\/span><\/td>\n<\/tr>\n
Ammonium sulfate<\/span><\/td>\n(NH\u2084)\u2082SO\u2084<\/span><\/td>\n21%<\/span><\/td>\nContains sulfur; suited to alkaline soils; acidifies soil over time<\/span><\/td>\n<\/tr>\n
Calcium nitrate<\/span><\/td>\nCa(NO\u2083)\u2082<\/span><\/td>\n15.5%<\/span><\/td>\nSupplies calcium alongside nitrogen; beneficial for tomatoes and fruit crops<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

For a complete breakdown of urea specifically\u00a0 including formulation types, application rates, foliar spray guidelines, and risks of misuse\u00a0 see our dedicated guide:<\/span> What Is Urea Fertilizer and How to Use It<\/span><\/a><\/p>\n

Phosphorus Fertilizers<\/b><\/h4>\n

Phosphorus is the element of roots and flowers. It stimulates strong root formation, promotes flowering and fruit set, and plays a central role in energy transfer within the plant.<\/span><\/p>\n

Single superphosphate (SSP):<\/b> 16\u201320% P\u2082O\u2085. Traditional formulation, slow-dissolving, well-suited to clay soils.<\/span><\/p>\n

Triple superphosphate (TSP):<\/b> 46% P\u2082O\u2085. Concentrated, fast-dissolving, ideal for soil application where high phosphorus is needed.<\/span><\/p>\n

DAP (Di-Ammonium Phosphate):<\/b> 46% P + 18% N. One of the most widely used phosphorus fertilizers\u00a0 feeds the plant with both primary nutrients simultaneously.<\/span><\/p>\n

Phosphoric acid:<\/b> 52\u201354% P\u2082O\u2085. Liquid form, added through the irrigation system; simultaneously lowers soil pH\u00a0 particularly useful in alkaline soils.<\/span><\/p>\n

Potassium Fertilizers<\/b><\/h4>\n

Potassium is the element of quality and resilience. It improves fruit size and quality, increases the plant’s resistance to drought and disease, and supports photosynthesis efficiency.<\/span><\/p>\n

Potassium sulfate (SOP):<\/b> The preferred choice for vegetables and fruits\u00a0 no chloride risk.<\/span><\/p>\n

Potassium chloride (MOP):<\/b> Highest concentration, most economical, but adds chloride which can harm chloride-sensitive crops.<\/span><\/p>\n

Potassium nitrate:<\/b> Supplies both potassium and nitrogen simultaneously\u00a0 excellent for flowering and fruiting stages in crops that need both nutrients at once.<\/span><\/p>\n

Compound Fertilizers<\/b><\/h4>\n

Compound fertilizers contain two or more macronutrients in defined ratios, delivering complete nutrition in a single application.<\/span><\/p>\n\n\n\n\n\n\n\n
\u914d\u65b9<\/b><\/td>\n\u7c7b\u578b<\/b><\/td>\nBest Use<\/b><\/td>\n<\/tr>\n
20-20-20<\/span><\/td>\nBalanced<\/span><\/td>\nGeneral nutrition across all growth stages<\/span><\/td>\n<\/tr>\n
13-40-13<\/span><\/td>\n\u9ad8\u78f7<\/span><\/td>\nEstablishment stage, root development, flowering stimulation<\/span><\/td>\n<\/tr>\n
12-12-36<\/span><\/td>\n\u9ad8\u94be<\/span><\/td>\nFruiting and fruit-sizing stage<\/span><\/td>\n<\/tr>\n
30-10-10<\/span><\/td>\n\u9ad8\u6c2e<\/span><\/td>\nVegetative growth in leafy crops<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

For guidance on selecting the right NPK formulation for each growth stage and crop type, see our full guide:<\/span>Best Fertilizer for Increasing Crop Yield<\/span><\/a><\/p>\n

Decisive Comparisons: Which Fertilizer Is Right for Your Soil and Crop?<\/b><\/h3>\n

NPK vs. DAP: Which Should You Choose?<\/b><\/h4>\n

When choosing between a compound NPK fertilizer and DAP, the answer depends on your crop’s growth stage and actual nutritional needs\u00a0 not on habit or supplier recommendation.<\/span><\/p>\n

Nutritional content:<\/b>
\n<\/b> DAP carries a fixed composition of 18% nitrogen and 46% phosphorus, making it a concentrated phosphorus source. Compound NPK fertilizers offer a range of ratios\u00a0 20-20-20 (balanced), 13-40-13 (high phosphorus), 12-12-36 (high potassium)\u00a0 giving you the flexibility to match the fertilizer precisely to your crop’s current stage.<\/span><\/p>\n

Use case:<\/b>
\n<\/b> DAP is primarily used at establishment, when the plant needs phosphorus to build a strong root system before vegetative growth begins. NPK is used throughout the entire season\u00a0 switching formulations as the crop moves from vegetative growth (high N) to flowering (high P) to fruiting (high K).<\/span><\/p>\n

Cost:<\/b>
\n<\/b> DAP is highly economical per unit of phosphorus, making it the preferred choice when high phosphorus is needed at low cost. Compound NPK fertilizers carry a higher price point due to their multiple-nutrient composition, but they eliminate the need to purchase and blend three separate fertilizers.<\/span><\/p>\n

Al-Qawafel tip:<\/b> Use DAP at establishment to support root development, then transition to specialized NPK formulations as the crop develops\u00a0 high nitrogen for vegetative growth, high phosphorus for flowering, high potassium for fruit sizing.<\/span><\/p>\n

Organic vs. Chemical Fertilizers: Key Differences<\/b><\/h4>\n\n\n\n\n\n\n\n\n
Feature<\/b><\/td>\nOrganic Fertilizer<\/b><\/td>\nChemical Fertilizer<\/b><\/td>\n<\/tr>\n
Source<\/span><\/td>\nNatural (plant or animal origin)<\/span><\/td>\nSynthetic (industrial production)<\/span><\/td>\n<\/tr>\n
Speed of effect<\/span><\/td>\nSlow\u00a0 requires decomposition<\/span><\/td>\nFast\u00a0 immediately or rapidly available<\/span><\/td>\n<\/tr>\n
Duration of effect<\/span><\/td>\nLong-term\u00a0 feeds the soil<\/span><\/td>\nShort-term\u00a0 feeds the plant directly<\/span><\/td>\n<\/tr>\n
Effect on soil<\/span><\/td>\nImproves structure long-term<\/span><\/td>\nCan increase salinity and reduce microbial activity<\/span><\/td>\n<\/tr>\n
Cost<\/span><\/td>\nRelatively higher<\/span><\/td>\n\u8f83\u4f4e<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Al-Qawafel tip:<\/b> Combining both types is the optimal approach. Use chemical fertilizers for fast nutrition during critical growth stages; use organic fertilizers for long-term soil improvement and sustained biological activity.<\/span><\/p>\n

Urea vs. Ammonium Nitrate: The Key Differences<\/b><\/h4>\n

Nitrogen concentration:<\/b>
\n<\/b> Urea contains 46% nitrogen\u00a0 the highest of any solid nitrogen fertilizer\u00a0 compared to 33.5% for ammonium nitrate. This makes urea more concentrated and more economical per nitrogen unit.<\/span><\/p>\n

Soil pH effect:<\/b>
\n<\/b> Urea is initially slightly alkaline, then gradually acidifies the soil over time. Ammonium nitrate is acidic from the start, making it better suited to alkaline soils that need pH reduction.<\/span><\/p>\n

Absorption speed:<\/b>
\n<\/b> Ammonium nitrate is immediately available for root absorption. Urea requires soil conversion via the enzyme urease\u00a0 a process that takes 1\u20133 days\u00a0 making ammonium nitrate the faster option in acute deficiency situations.<\/span><\/p>\n

Stage suitability:<\/b>
\n<\/b> Urea is ideal at the onset of vegetative growth when the plant needs nitrogen to build leaves and stems. Ammonium nitrate is preferred at flowering and fruiting stages, and in alkaline soils with elevated pH.<\/span><\/p>\n

Volatilization loss:<\/b>
\n<\/b> Urea loses a significant proportion of its nitrogen through volatilization in high heat or when left on the soil surface without incorporation. Ammonium nitrate has a lower volatilization risk, making it more efficient in hot conditions.<\/span><\/p>\n

Selection Guide: Best Chemical Fertilizer for Your Goal<\/b><\/h3>\n

Best Fertilizer for Root Development<\/b><\/h4>\n

High-phosphorus fertilizer\u00a0 NPK 10-52-10 or DAP. Phosphorus is the essential element for root formation and development. Apply at the establishment stage and before planting; incorporate into the root zone for best absorption.<\/span><\/p>\n

Best Fertilizer for Fruit Sizing<\/b><\/h4>\n

High-potassium fertilizer\u00a0 NPK 10-10-40 or potassium sulfate. Potassium has the greatest direct impact on fruit size, taste, color, and shelf quality. Apply during the fruiting and fruit-fill stages.<\/span><\/p>\n

Best Fertilizer for Leafy Crop Production<\/b><\/h4>\n

High-nitrogen fertilizer\u00a0 urea 46%, ammonium sulfate, or NPK 30-10-10. Nitrogen drives vegetative growth and increases leaf density and size. Apply at the onset of growth and during the active vegetative phase\u00a0 avoid excess, which delays flowering.<\/span><\/p>\n

How to Use Chemical Fertilizers Correctly and Avoid Their Risks<\/b><\/h3>\n

Fertilization Timing by Growth Stage<\/b><\/h4>\n\n\n\n\n\n\n\n
Stage<\/b><\/td>\nRecommended Fertilizer<\/b><\/td>\n<\/tr>\n
Pre-planting<\/span><\/td>\nPhosphorus and potassium\u00a0 incorporated with tillage<\/span><\/td>\n<\/tr>\n
\u65e0\u6027\u751f\u957f<\/span><\/td>\nNitrogen applied in split doses<\/span><\/td>\n<\/tr>\n
Pre-flowering<\/span><\/td>\nPhosphorus and potassium<\/span><\/td>\n<\/tr>\n
Fruiting<\/span><\/td>\nPotassium\u00a0 applied throughout fruit development<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Al-Qawafel tip:<\/b> Never fertilize during winter dormancy or in extreme heat. Nutrient absorption is minimal under both conditions, and accumulated fertilizer salts can damage soil structure.<\/span><\/p>\n

 <\/p>\n

Calculating Dose and Preventing Salinity<\/b><\/h4>\n

Before applying any fertilizer, you must know your crop’s actual nutritional requirements\u00a0 soil analysis is the essential first step for determining the correct dose. Every crop has specific dose requirements that vary by age, type, and growing conditions.<\/span><\/p>\n

To prevent salt accumulation:<\/b><\/p>\n