Rice returning to field management

After transplanting rice seedlings, it's crucial to focus on field management during the first few days. About three days after transplanting, the seedlings begin to grow, and their leaves start to exude water. On sunny days, the leaves unfurl, and new roots develop, marking the stage of "greening." At this critical phase, the main tasks include checking the seedlings, filling in gaps, and ensuring proper plant density and number. This helps maintain a healthy stand and supports robust growth. Another key aspect is managing irrigation. The green-up period is highly sensitive to moisture levels. Since the root system is still recovering from transplanting, its ability to absorb water is reduced, making the plants prone to water stress. Insufficient water can delay the greening process or cause seedling death, while excessive water may hinder normal recovery. Therefore, maintaining a shallow water layer (around 3 cm) is recommended for optimal growth. Applying nitrogen-based fertilizer at the right time is also essential. Typically, within 2 to 3 days after transplanting, applying fertilizer promotes early leaf growth, tillering, and stronger seedlings. It’s important to apply the fertilizer evenly and ensure it’s well incorporated into the soil or mixed with irrigation water. In addition to these practices, weed control is vital. Weeds grow quickly and compete aggressively with rice for water, nutrients, and sunlight, which can negatively impact crop development. Common weeds in paddy fields include grasses, sedges, and broadleaf species such as dwarf arrowhead and bamboo vegetables. Effective weed management is crucial to prevent yield loss and ensure healthy rice growth. There are several chemical herbicides available that farmers can use. Based on field observations and user feedback, the following options are commonly recommended: 1. **Herbicides mixed with soil or fertilizer** - 125% refined Grass Star: 25–35 g/acre, applied 5–9 days after transplanting. - 220% Glutinous Rice: 30–45 g/acre, applied 5–12 days after transplanting. - 15.6% Kunming No. 2: 50 g/acre, applied 3–7 days after transplanting. - 20% Kunqi: 150 g/acre, applied 10–25 days after transplanting. - 50% Paraquat: 80–100 g/acre, applied 10 days after transplanting (after seedlings have turned green). - 50% Butachlor: 150–200 g/acre, applied 5–7 days after transplanting. - 10% DuPont New Effective: 10 g/acre, applied 7–10 days after transplanting. These herbicides should be mixed with 20–25 kg of soil or fertilizer and applied evenly either in the morning after dew has dried or in the late afternoon. 2. **Directly applicable herbicides** - 9% Lazy Han: 45–60 g/acre, applied 4–7 days after transplanting. - 30% Yunnan Tianmao: 40–60 g/acre, applied 3–5 days after transplanting. These should be sprayed in the morning after the leaves have dried or in the late afternoon. 3. **Herbicides for post-emergence weed control** - 50% Scorpion Herbicide: Apply 25 g per 2-leaf stage, adding 5 g of yam if needed for more severe infestations. Spray 30 kg of water evenly before application. Keep the field flooded at 3–5 cm for 5–6 days after treatment. - 10% DuPont New Effective: Apply 10 g/acre when weeds have 2–3 leaves, spraying 25 kg of water evenly. For specific weeds like dental grass, spray when the leaves turn from red to green. Drain the field, then re-flood with 3–4 cm of water for 5–7 days after application. By following these practices, farmers can effectively manage their rice fields, reduce weed competition, and promote healthy, vigorous plant growth. Proper timing and application methods are key to achieving the best results.

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