What if there is fertilizer damage to rice seedlings?

Blindly increasing the amount of chemical fertilizer will cause a variety of physiological obstacles in rice seedlings and make the growth and development of rice abnormal after transplanting. Excessive application of unripe organic fertilizer will also cause poor growth of rice. This kind of physiological obstacle caused by excessive application of fertilizer is called "fertilizer damage".

First, there are many reasons for fertilizer damage of rice seedlings, which can be summarized as follows: first, improper fertilization methods. Such as the application of ammonia or ammonium bicarbonate in the case of high temperature at noon, the volatile ammonia will cause fumigation injury to rice plants; second, the amount of fertilizer application is too large. If the green manure is overpressed, acid damage is easy to occur. Excessive application of nitrogen fertilizer will also cause fertilizer damage; third, poor quality of chemical fertilizer will cause fertilizer damage. For example, urea contains a substance called biuret, which is toxic to crops, especially affecting seed germination.

The adverse effects of fertilizer are multifaceted. First of all, it directly harms the crops, resulting in the burning of the leaves and roots, and even the death of the whole plant; the second is to cause pollution to the agricultural environment, which makes the harm even greater.

Second, rescue measures when fertilizer damage occurs in rice, immediately irrigate the field with "horse race water" to reduce the fertilizer concentration; if the dead seedling rate reaches more than 30%, turn the plough and replant in time, turn the fertile topsoil layer deep to the bottom, rake flat and replant rice seedlings, or plant other crops. When the amount of nitrogen fertilizer application is large, the rice plant will grow too much, and the population will be too large. When the tillers reach the planned number, drain and roast the field in time. Roast until the seedlings are yellowed, the leaves are upright, and then irrigate deep-water booting, change the ventilation and light transmission conditions in the field, control invalid tillers, and prevent greedy green late ripening; in rice jointing, booting and filling stages, 0.2% potassium dihydrogen phosphate solution is used as foliar spraying to regulate carbon-nitrogen ratio, enhance photosynthesis and inhibit vegetative growth. If the nitrogen fertilizer is not applied properly, the disease of rice should be controlled by spraying in time.