In order to fully exert the effect of humic acid fertilizer after application, pay attention to the following humic acid fertilizer usage and taboos when using it:
① The pH value of potassium humate and sodium humate liquid fertilizer spraying is best controlled at 7.2-7.5. If it exceeds 8, add a small amount of acid to adjust it.
② Ammonium humate can only fully exert its fertilizer effect in an environment with sufficient soil moisture.
③ It is best not to apply ammonium humate in protected areas to avoid fumigation accidents due to excessive concentration of free ammonium ions.
④ Various types of humic acid fertilizers have different nutrient ratios and production processes, so the fertilizer properties vary greatly and the appropriate dosage is also different. All regions must apply according to the fertilizer instructions and cannot arbitrarily increase or decrease the dosage.
⑤ Humic acid fertilizers cannot completely replace chemical fertilizers and farmyard manures. They are mutually enhancing. Humic acid fertilizers are more effective when used in combination with chemical fertilizers and farmyard manures.
⑥ It is best to choose activated humic acid fertilizers. Unactivated humic acid fertilizers will only start to activate when they are in the soil, and the fertilizer effect is very slow.
⑦ Since pure humic acid is not conducive to the formation of water-stable granular structure in the soil, pure humic acid fertilizers should not be applied to the soil, and should be applied as foliar fertilizers. However, what is usually seen on the market is not pure humic acid fertilizers, so normal flushing and drip irrigation in the soil is OK.
⑧ Pay attention to the temperature during application. After application, the effect will be fast in hot weather and slow in cold weather. Generally, the temperature needs to be effective after at least 18 hours. If the temperature is higher than 38℃, it will accelerate the respiration of crops and reduce the accumulation of dry matter, resulting in reduced yield. Application should be stopped or the number and amount of application should be reduced.
The above is the content related to the use and taboos of humic acid fertilizers shared by this article.