Fertilizers need to be supplied for a long period of time, and it is best to apply them according to the physiological characteristics of the crops in various periods, and there is no need to blindly pursue quick-acting.

Generally speaking, the fertilizer validity period of fertilizer products is as follows (for reference only):

Ammonium bicarbonate: It takes effect on the same day, and the fertilizer effect period is 15 days;

Ammonium chloride: effective in three days, fertilizer effect period is 25 days, defertilization in later period;

Urea: effective in seven days, fertilizer effect period is 45 days;

Compound fertilizer: effective in ten days, fertilizer effect period is 90 days;

Biological fertilizer: generally effective in about one month, the effect is not very obvious on crops with long growth cycle, but the fertilizer effect can last for 6 to 8 months;

Hormones: It takes effect quickly, but it doesn't have much nutrition by itself, so it doesn't help much to increase production.