To ensure healthy seedling growth with strong stems, short internodes, and well-developed roots, the bed soil must be rich in nutrients. For an area of 11.3 square meters, apply 200 kg of organic fertilizer, along with 0.5 kg of superphosphate and 0.5 kg of potassium sulfate. Mix the fertilizers thoroughly into the soil. Alternatively, you can use 100–150 kg of manure-based compost combined with 1 kg of NPK fertilizer to enhance soil fertility.
Before planting eggplants, it's essential to prepare the soil properly. Apply 5,000–7,000 kg of organic fertilizer per acre, along with 15 kg of superphosphate and 10 kg of potassium sulfate. Then plow the field to mix the nutrients into the soil. Before transplanting, you may also apply 3,000–5,000 kg of organic fertilizer per acre, followed by hoeing or tilling. After transplanting, add 1,500 kg of organic fertilizer and 25–50 kg of a balanced NPK compound fertilizer. You can also include trace elements such as 1 kg of zinc sulfate and 2 kg of manganese sulfate for better plant development.
Throughout the growing season, eggplants require consistent nutrient supply. Nutrient uptake increases rapidly after full flowering, making the period from the first harvest to the fourth fruiting stage the most critical for top-dressing. During this time, apply fertilizer every 10 days. Each application can include 15–20 kg of ammonium sulfate, 7.5–10 kg of urea, or 10–15 kg of ammonium nitrate. Using well-rotted human manure is also highly beneficial—about 500–600 kg of liquid manure per acre. Fertilization can be done through furrow application, injection, or foliar spraying.
It’s important to avoid applying phosphorus-rich fertilizers during the later growth stages, as this may promote seed development inside the fruit, leading to harder seeds and reduced market value. Always follow the principle of using organic manure as the main source, with chemical fertilizers used as a supplement. Be cautious not to overapply chemical fertilizers, especially nitrogen, as excessive accumulation can lead to abnormal cell division in flower buds and even cause nitrate buildup in the fruit tissue, which can affect quality and safety.
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