Generally speaking, for every 500 kilograms of rice produced, 8 to 16 kilograms of pure nitrogen need to be absorbed from the soil, 4 to 7.5 kilograms of phosphorus (phosphorus pentoxide), and 9 to 19 kilograms of potassium (potassium oxide). These The absorption of elements is distributed in every growth period of rice.
The law of nitrogen absorption by rice is: transplanting to booting stage, accounting for about 10% of the total; tillering to booting stage, accounting for about 80% of the total; booting to maturing stage, accounting for about 20% of the total.
The law of phosphorus absorption by rice is: tillering to booting stage, which accounts for about 50% of the total; booting to maturity, accounting for about 50% of the total.
The absorption rules of potassium by rice are: turn green to tillering stage, accounting for about 5% of the total; tillering to young ear differentiation stage, accounting for about 35% of the total; young ear differentiation to the flowering stage, accounting for about 60% of the total %.
After the heading stage, the absorption of nitrogen, phosphorus, and potassium by rice gradually weakens, and most of the nutrients and nutrient elements required for the grain filling stage are stored in the early stage of heading. Therefore, we must master the normal fertilization time and control the amount of fertilizer.
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Disposable Laparoscopic Trocar
Disposable laparoscopic trocars are typically made of plastic or metal and are designed for single-use only. They are available in a range of sizes and shapes to accommodate different patient needs and surgical procedures. The trocar is typically inserted into the patient's abdomen using a technique called "blind insertion," which involves inserting the trocar through the skin without direct visualization of the underlying tissue.
The disposable nature of these trocars makes them a convenient and cost-effective option for many surgical procedures. They are also less likely to cause infections or other complications compared to reusable trocars, as they are sterile and do not require cleaning or sterilization between uses. However, it is important to follow proper disposal procedures to prevent contamination and ensure patient safety.
Disposable trocars are designed for single use, reducing the risk of infection and cross-contamination between patients. Trocars are usually made of plastic and come in a variety of sizes, depending on the size of the incision and the surgical instruments used.
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