Soil cultivation plays a crucial role in determining the yield and quality of ginger. Proper soil management helps the plant grow vigorously and produce high yields. Ginger roots thrive in dark, moist conditions and stop growing when exposed to light. Therefore, it's essential to cultivate the soil as the ginger grows. If the soil isn't cultivated on time, the rhizome may be exposed to air, which can significantly reduce both quality and yield.
For Jiang Peituo, it’s important to adapt practices based on local conditions. The first earthing should be done when the rhizome has 3–5 tillers, and the surface is not yet exposed. At this stage, the soil layer should be about 2 cm thick. Using tools like a small rake or hook, you can create a 4–5 cm wide ridge along the edges of the planting ditch, then water it. This not only suppresses weed growth but also allows the rhizome to expand properly. The first layer shouldn’t be too thick, as it could reduce soil permeability, block sprout growth, and slow down root development, ultimately affecting yield and quality.
The second earthing should take place 20 days after the first one, with a soil layer of 2–3 cm. Using a small rake or hook, push the soil from both sides into the planting ditch. Again, avoid making the layer too thick, as this can hinder rhizome growth and reduce yield.
The third earthing, often called “large culture,†occurs 15 days after the second one, with a recommended soil thickness of 7–8 cm. At this point, all the soil from the original ridge should be moved into the planting ditch, turning the ditch into a ridge and the ridge into a ditch. This step is critical for the overall growth of the ginger. If the soil is too shallow, the rhizome will be short and thick; if too deep, it will be long and thin. Always monitor for new buds and cultivate the soil promptly to ensure healthy root development.
Each time you perform earthing, combine it with fertilization and watering. Apply fertilizer first, then cultivate the soil. Before the first and second earthing, apply 5 kg of compound fertilizer and 40 kg of bio-organic fertilizer per acre, keeping it at least 15 cm away from the base of the plant to avoid damaging the seedlings. After earthing, water the plants. For the final fertilization, increase the amount—use 50 kg of compound fertilizer and 75 kg of bio-organic fertilizer per acre. This is the peak growth period for the rhizomes, so adequate nutrients are essential for optimal yield.
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