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

Sugarcane has varying fertilizer requirements throughout its growth cycle, with the mid-stage demanding the most nutrients. The absorption of nitrogen, phosphorus, and potassium differs across the five growth stages. Typically, the early and late stages require less fertilizer, while the middle stage needs a significant amount to support rapid development. During the sprouting phase, sugarcane relies on the nutrients stored in the seedlings themselves, so external fertilization is unnecessary at this point. In the seedling stage, the plant requires some nutrients, but in small quantities. Nitrogen demand is highest during this time, followed by potassium and phosphorus. At this stage, the total absorption of the three elements accounts for less than 1% of the total fertilizer used throughout the entire growing season. As the crop enters the tillering stage, growth becomes more vigorous, and the need for nutrients gradually increases. During this period, nitrogen absorption accounts for over 6% of the total, potassium for more than 5.5%, and phosphorus for less than 3%. This shows a rising trend in nutrient uptake as the plant develops. The elongation stage marks a critical period for sugarcane growth. As the shoot, leaves, and root system expand rapidly, and the cane stem grows quickly, the plant begins to accumulate more assimilation products. During this phase, the plant absorbs over 50% of the total nutrients required for the entire season. Specifically, nitrogen accounts for about 51%, phosphorus for over 73%, and potassium for approximately 79%. This makes the beginning of the elongation stage a key time for fertilization, often referred to as the "stem fertilizer application" period. In the maturation stage, temperatures drop, and the weather becomes drier, causing sugarcane growth to slow or stop. Although the need for nutrients decreases, the plant still requires a considerable amount to support the metabolic activities of its various parts. During this time, phosphorus and potassium make up about 20% of the total nutrient absorption, while nitrogen accounts for 30% to 40%. To prevent waste and promote better ripening, farmers are advised to stop fertilizing two months before harvest. (Author: He Shulin, Hunan Provincial Department of Agriculture)

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