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46-0-0 fertilizer is urea, which is a high-nitrogen fertilizer (46% nitrogen, 0% phosphorus, 0% potassium). Nitrogen is crucial for vegetative growth, meaning it promotes the development of leaves and stems.
For durians, 46-0-0 fertilizer can be good, but its application needs to be strategic and balanced with other nutrients. Here's why and how:
When 46-0-0 is good for durians:
* Leaf flushing and vegetative growth: Durian trees need a good flush of new leaves to photosynthesize efficiently and support fruit development. High-nitrogen fertilizers like 46-0-0 are excellent for stimulating this leafy growth, especially during the vegetative stage (when the tree is establishing itself and growing new branches and leaves).
* Young durian trees: Younger trees primarily focus on developing a strong root system and canopy, so a higher nitrogen content can be beneficial in the early stages.
When 46-0-0 might not be ideal or needs to be used with caution:
* Before flowering and during fruiting: As durians approach flowering and fruit development, the nutrient requirements shift significantly. At these stages, phosphorus (P) and potassium (K) become more critical for flower initiation, fruit set, fruit quality, and overall tree health. Applying too much nitrogen during these stages can lead to excessive vegetative growth at the expense of flowering and fruiting, or even cause fruit drop.
* Unbalanced nutrition: Durian trees, like most fruit trees, need a balanced diet of macro and micronutrients throughout their lifecycle. Relying solely on 46-0-0 would lead to deficiencies in phosphorus, potassium, and other essential elements, which would negatively impact yield and fruit quality.
* Excessive application: Too much nitrogen can cause "soft" or "lush" growth, making the tree more susceptible to pests and diseases. It can also lead to nutrient imbalances in the soil.
* Rainy season: Some sources suggest avoiding heavy application of 46-0-0 during the rainy season for young durian trees, as it can lead to elongated, watery shoots that are more vulnerable to diseases and pests.
Recommendations for durian fertilization:
* Understand the growth stage: The specific NPK ratio (Nitrogen-Phosphorus-Potassium) of fertilizer needed for durians varies depending on the tree's growth stage:
* Vegetative growth (leaf flushing): Higher nitrogen (e.g., 46-0-0 or 15-0-0, or balanced NPK like 1:1:1 ratios).
* Before flowering and during flowering: Higher phosphorus and potassium (e.g., 9-24-24, 8-24-24, or 12-12-17:2).
* Fruit development: Higher potassium is crucial for fruit size, weight, and quality (e.g., 13-13-24).
* Soil testing: The best approach is always to conduct a soil test to determine the specific nutrient deficiencies in your orchard. This will allow you to tailor your fertilization program precisely.
* Foliar application: In addition to soil fertilization, foliar sprays with appropriate nutrient formulas can provide a quick boost, especially during critical growth periods.
* Consider organic matter: Incorporating organic fertilizers and soil amendments can improve soil health and nutrient availability over the long term.
* Sulfate of Potash (SOP): Durian trees are sensitive to chloride, so using potassium sources like Sulfate of Potash (SOP) (0-0-50) is generally preferred over Muriate of Potash (MOP) (0-0-60), which contains chloride.
In summary, 46-0-0 can be a valuable tool for promoting vigorous vegetative growth in durian trees, especially in their early stages or during periods of leaf flushing. However, it should be part of a comprehensive and balanced fertilization program that adjusts to the tree's different growth phases to ensure optimal flowering, fruiting, and overall health.

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