1. Depending on local conditions: For soils with high sulfur content and rust fields, it is not advisable to apply biological fertilizers because sulfur can kill biological bacteria. For the paddy field, it is generally not necessary to apply it, and the effect of the spray method is more obvious.

2. Due to the temperature: the optimum temperature for applying the bacterial fertilizer is 25 ° C ~ 37 ° C, below 5 ° C, above 45 ° C, the application effect is poor. It is not suitable for the application of crop fields under high temperature, low temperature and drought conditions. At the same time, it should also be known that the optimum moisture content of nitrogen-fixing bacteria is 60% to 70%.

3. Due to mixing: It should be noted that the bacterial fertilizer should not be mixed with fungicides, insecticides, herbicides and sulfur-containing fertilizers (such as potassium sulfate) and straw ash, because these drugs and fertilizers are easy to kill. Dead bacteria. Or first apply the fertilizer, after 48 hours, then fight the herbicide. If seed dressing, avoid mixing with seeds that have been mixed with fungicide. It should also prevent mixing with unfertilized farmyard manure.

4. Depending on the quantity: For the field where fertilizer is applied for many years, the application of biological fertilizer should not reduce the application of chemical fertilizers and organic fertilizers. Because the crops are dependent on chemical fertilizers, the use of biological fertilizers instead of nitrogen fertilizers cannot be adapted at once. Therefore, the substitution amount should be 30%, 40% and 60% in the first, second and third years respectively. Phosphorus and potassium fertilizers can only be supplemented and cannot be reduced.

5. Time-adapted: Bio-fertilizer is not a quick-acting fertilizer, and it is best applied in the nutrient critical period of the crop and 7-10 days before the nutrient absorption period.

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