2results about How to "Difficult to grow" patented technology

The utility model relates to the technical field of seedling raising, and discloses a pot-shaped blanket seedling raising tray, the bottom of the seedling raising tray is provided with a plurality of pot bowls arranged longitudinally and transversely, the bottom of the pot bowl is provided with a through hole, the upside of the bottom of the pot bowl is fixed with a protrusion, and a connecting hole communicated with the through hole is formed in the protrusion. When the utility model is used for seedling raising, the root system grows in the pot bowl, and the root system is not easy to find the through hole to grow downward due to the arrangement of the protrusion. The root system basically does not grow downward to penetrate the seedling raising tray and then penetrate the soil. After seedling raising is completed, the seedlings are basically in the pot bowls, and the seedlings will not be broken when they are picked, thereby improving the seedling raising effect.

The invention provides a method for preparing ultrapure nano copper powder. The method adopts a metal copper salt as a precursor, polyvinyl pyrrolidone (PVP) as a morphology control reagent, ethylenediaminetetraacetic acid (EDTA) and hexamethylenetetramine as modifiers, and dialysis as a method for removing ions to prepare ultrapure nano copper powder. The nano copper powder obtained by the method has uniform size and high purity, and its highest purity can reach 99.998%. The method uses dialysis and modifiers together to improve the purity of nano copper powder; the method provided by the invention is green, efficient and low-cost.