Carrot non-polluting fertilization technical specification
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July 07 07:27:08, 2025
(1) Selection of High-Quality Varieties: The seeds used must comply with the standards set by GB8079-1987, and genetically modified carrot varieties are strictly prohibited. Recommended high-quality varieties include Beijing Whip Stalk Red, Candle Holder, Yantai 5-Inch, Xi'an Red, Nanjing Red, Five-Inch Ginseng, and Kuroda 5-Inch. Before sowing, the seeds are treated to remove their bristles for better germination. After disinfection, the seeding rate is increased to ensure sufficient seedlings and healthy growth.
(2) Soil Preparation and Timely Sowing: Prior to planting, it is recommended to apply 3500–75000 kg of well-decomposed organic manure per hectare, along with 1500 kg of wood ash and 225–300 kg of compound fertilizer. The soil should be deeply plowed and thoroughly mixed with the fertilizer to prevent root damage and uneven growth. Proper leveling of the field is essential before sowing. Typically, 525,000 to 750,000 plants are planted per hectare. In soils deficient in calcium, magnesium, or boron, additional compound fertilizers containing these nutrients are applied to enhance plant health and yield.
(3) Top-Dressing and Field Management: Once the seedlings emerge, timely thinning, weeding, and removal of diseased plants are crucial. Watering should be done regularly to support growth. Carrots primarily depend on base fertilization, and top-dressing is generally not required, which helps reduce the risk of chemical contamination. However, if the base fertilizer is insufficient, a suitable amount of additional fertilizer may be applied based on the condition of the seedlings. For instance, 15,000 kg of decomposed human fecal urine per hectare can be applied before ridge formation and during the straightening stage. About 25–30 days before harvest, an extra-root dressing with 45 kg of potassium dihydrogen phosphate and 1875 kg of water per hectare is recommended. In boron-deficient soils, spraying 0.1% to 0.25% borax or boric acid at the seedling, rosette, and root enlargement stages improves nutrient uptake. For fields with high nitrogen content, applying 150 kg of sodium chloride per hectare can help lower nitrate levels in the carrots. When carrots are sown in the autumn, they should be harvested promptly to avoid frost damage. All tools used during harvesting must be clean, hygienic, and non-polluting. The entire process of packaging, transportation, and storage must follow the guidelines outlined in DB1304/049 to ensure product quality and safety.