The cultivation of 1,000 kg of spinach typically requires approximately 1.6 kg of pure nitrogen, 0.83 kg of phosphorus pentoxide, and 1.8 kg of potassium oxide. Before planting, it's recommended to apply 5,000 kg of high-quality organic fertilizer along with 40 kg of phosphate fertilizer as a base fertilizer to enrich the soil and promote healthy growth from the start.
As the spinach seedlings grow to about 10 cm in height, it's important to apply an overwintering fertilizer based on their development. This top dressing should include around 10 to 15 kg of nitrogen fertilizer and 10 to 15 kg of phosphate fertilizer. To protect the plants from winter damage, make sure to water the field thoroughly with frozen water before the cold sets in, which helps prevent root damage and plant death during the freezing period.
Once spring arrives, timely fertilization is crucial. Apply 20 to 25 kg of nitrogen fertilizer and 15 to 20 kg of phosphorus and potassium fertilizers every 10 to 20 days, depending on the crop's needs. It’s important to avoid applying fertilizer directly into the center of the spinach plants, as this can burn the young leaves. Always combine each top dressing with proper watering to ensure even nutrient absorption.
In addition to soil fertilization, foliar feeding can also be beneficial. A 0.3% concentration of liquid fertilizer can be sprayed directly onto the leaves for quick nutrient uptake. This method is especially useful during periods of rapid growth or when the plants show signs of nutrient deficiency.
By following these guidelines, you can ensure that your spinach crops receive the right balance of nutrients throughout the growing season, leading to higher yields and better quality produce. Proper timing and application methods are key to maximizing the benefits of fertilization while minimizing the risk of plant damage.
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