lisälannoitusta

Lisälannoitus, often translated as supplementary fertilization or top dressing, refers to the application of nutrients to crops after their initial planting or establishment. This practice is distinct from the base fertilization that occurs before or during sowing, which aims to provide a foundational supply of essential elements. Lisälannoitus is typically employed to address specific nutrient deficiencies that may arise during critical growth stages of the plant, or to compensate for nutrient losses from the soil through leaching or plant uptake.

The primary purpose of lisälannoitus is to optimize crop yield and quality. As plants grow, their demand for nutrients increases. If the soil's inherent nutrient supply or the initial base fertilization is insufficient to meet these demands, a deficiency can occur, leading to stunted growth, reduced flowering or fruiting, and lower overall productivity. Lisälannoitus provides a targeted boost of nutrients, such as nitrogen, phosphorus, potassium, or micronutrients, precisely when and where they are most needed.

Commonly, lisälannoitus is applied to grain crops, forage crops, and horticultural plants. Nitrogen is frequently the focus of lisälannoitus, especially in cereals, as it is highly mobile in the soil and readily absorbed by plants for vegetative growth. However, other nutrients may also be supplemented depending on soil analysis, crop requirements, and observed deficiency symptoms. The method of application can vary, including broadcasting granular fertilizers, applying liquid fertilizers, or using foliar sprays, with the choice often depending on the nutrient, the crop, and the prevailing weather conditions. Effective lisälannoitus requires careful consideration of nutrient timing, dosage, and form to maximize benefits while minimizing environmental risks like nutrient runoff.