To use drip irrigation system to fertilize, it is necessary to carefully study the solubility of fertilizer. Fertilizers that are insoluble, have low solubility, or are prone to react to form precipitation under certain conditions should be avoided.
Most solid fertilizers have a coating on the outside. In order to avoid clogging of the drip irrigation system by the coating, it is best to select a small amount of sample into the dissolution tank and stir, and then observe the dissolution of the coating. If the coating material settles to the bottom of the tank after dissolution, allow the fertilizer injector to absorb the upper layer of solution when fertilizing, and do not disturb the entire fertilizer solution.
When urea, nitric acid, calcium nitrate, and potassium nitrate are dissolved, they absorb the heat in the water, and the temperature of the water is greatly reduced. At this time, the dissolved amount may not reach the required amount. In order to fully dissolve, it is best to leave the solution for several hours. As the temperature rises, the remaining undissolved part will gradually dissolve, and then it can be injected into the drip irrigation system.
Before injecting, the drip irrigation equipment should be observed and tested in order to evaluate the possibility of clogging the dripper. Some fertilizers need to be blended into the water for 1 to 2 hours to see if there is any precipitation and how much precipitation is.
If it is mixed into the water for several hours, the solution is still chaotic, which may clog the drip irrigation system. If several fertilizers are applied at the same time, take samples before injecting them into the system and put them into the observation tank at the same time in actual proportions to observe the dissolution after mixing, and then decide whether to inject them at the same time.