Long-lasting fertilizer effect, suitable for base application. Extensive trials show that both binary and ternary compound fertilizers are best applied as base fertilizers. This is because compound fertilizers contain various nutrients such as nitrogen, phosphorus, and potassium. Crops are particularly sensitive to phosphorus and potassium during the early stages, requiring early application of phosphorus and potassium fertilizers. Controlled-release compound fertilizers adopt processes like coating and granulation during production, providing a slow and steady effect, slower decomposition than single-nutrient fertilizers, less nutrient leaching, and higher utilization rates, making them ideal for base application. The general application rate is 30 to 40 kilograms per mu. Compound fertilizers are not suitable for seedling stage or mid-late stage fertilizers to prevent excessive growth.
Compost decomposes slowly, so for crops that are fertilized with compound fertilizer at sowing time, it is necessary to timely supplement quick-acting nitrogen fertilizer during topdressing, according to the specific nutrient requirements of different crops.
Compost fertilizers come in varying concentrations, and it's important to select the appropriate one. Most composite fertilizers are formulated based on the average nutrient content of soil types in a certain region and the nutrient requirements of major crops. The market offers high, medium, and low concentration series of composite fertilizers, with low concentrations typically containing 25% to 30% total nutrients, medium concentrations between 30% and 40%, and high concentrations above 40%. Choose a composite fertilizer that is both economical and efficient based on the region, soil type, and crop. Generally, high-concentration composite fertilizers are used for cash crops, as they offer superior quality, less residue, and high utilization rates.
High-concentration compound fertilizer should be kept away from seeds to prevent seed-to-fertilizer contact, which can affect seedling emergence and even cause seedling burns or root rot. When sowing, maintain a distance of about 5 to 10 centimeters between the seeds and the compound fertilizer applied in holes or strips. Avoid applying fertilizer directly in the same hole as the seeds to prevent fertilizer damage.
Different blended fertilizer ratios require attention to the range of nutrient components. The raw materials used in different brands and concentrations of blended fertilizers vary, and production should select the appropriate use based on soil type and crop species. Do not use ammonium ion-based blended fertilizers containing nitrate roots on leafy vegetables or paddy fields; they are not suitable for saline-alkali soils. Avoid using blended fertilizers containing potassium chloride or chloride ions on crops that are sensitive to chlorine or in saline-alkali soils. Blended fertilizers containing potassium sulfate are not suitable for use in paddy fields or acidic soils. Otherwise, it may reduce fertilizer effectiveness and even harm the crops.
Composted fertilizers contain two or more major elements. Ammonia is easily volatile, leading to loss due to application or rainfall, while phosphorus and potassium are easily fixed by the soil. Particularly, phosphorus has low mobility in the soil, making it difficult for plant roots to absorb and utilize when applied on the surface. This also hinders root penetration. In dry conditions, the fertilizer fails to dissolve, further reducing its effectiveness. Therefore, it is recommended to avoid surface application of compound fertilizers and instead, to apply them deeply and cover them with soil.
Properly utilizing compound fertilizers can yield substantial profits. Additionally, when selecting compound fertilizers, be mindful of their nutrient content, packaging, and manufacturer to avoid fraud.
Plants require more than just nitrogen, phosphorus, and potassium; they also need various other elements like calcium and magnesium. A compound fertilizer, in fact, refers to fertilizers containing two or more elements essential for plants, such as hydroxylapatite. When applying compound fertilizers to plants, one should consider the plant's growth stage and type, and use compound fertilizers rich in the required elements to promote growth. However, excessive use of compound fertilizers can lead to an accumulation of certain elements in the plant, hinder growth, and possibly cause soil salinity that burns the seedlings.
