Sugar cane sucking fertilizer before and after the law requires less fertilizer in the mid-term needs more fertilizer

Sugarcane has specific fertilizer requirements during different growth stages, with the middle phase requiring the most nutrients. The demand for nitrogen, phosphorus, and potassium varies throughout the five key growth periods. Generally, the early and late stages require less fertilizer, while the mid-stage demands a significant amount. During the sprouting stage, sugarcane relies on the nutrients stored in the seedlings themselves, so external fertilization is unnecessary at this point. In the seedling stage, although some nutrients are needed, the quantity is small. Nitrogen is the most critical element here, followed by potassium and phosphorus. At this stage, the total absorption of these three elements accounts for less than 1% of the overall fertilizer requirement. As the plant enters the tillering stage, its growth accelerates, and the need for nutrients gradually increases. During this period, nitrogen absorption accounts for over 6%, potassium for more than 5.5%, and phosphorus for less than 3% of the total fertilizer used throughout the growing season. The elongation stage marks a critical period when sugarcane grows rapidly, with increased development of shoots, leaves, and roots, as well as stem elongation. During this time, the uptake of all three nutrients rises sharply, accounting for more than 50% of the total nutrient absorption. Specifically, nitrogen makes up about 51%, phosphorus over 73%, and potassium around 79% of the entire period’s intake. This stage is considered the most efficient for nutrient use, and it's crucial to apply fertilizer at this time—often referred to as the "stem fertilizer" application. In the maturation stage, temperatures drop, and the weather becomes drier, causing the sugarcane to grow more slowly or even stop. Although the overall growth slows, the plant still requires substantial nutrients to support the metabolic processes of its various parts. At this stage, phosphorus and potassium account for approximately 20% of the total nutrient uptake, while nitrogen accounts for 30% to 40%. To avoid waste and promote better ripening, farmers are advised to stop applying fertilizer two months before harvest. (Author: He Shulin, Hunan Provincial Department of Agriculture)

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