How to Sprinkle Compound Fertilizer at Rice Jointing Stage

In the jointing stage of rice, we usually have to carry out one or two times of topdressing. In previous years, we used urea, but this year we switched to tower granulation fertilizer. This is a kind of compound fertilizer with high content of nitrogen and low content of phosphorus and potassium. The shape of the fertilizer particles is round, but there are holes in it and the specific gravity is light. Before fertilizing, we first discharged the flood, then sprinkled the compound fertilizer particles on the soil surface, and then released the water back to the field. After the water layer is full, we find that some fertilizer particles appear on the water surface, these floating granular fertilizers are blown to one side with the wind, and some stay in the corner of the wind. We are a little worried that we don't know if this will affect the effect of fertilizer application.

The reporter interviewed rice experts from the Provincial Academy of Agricultural Sciences on this issue. The experts pointed out that the floating of compound fertilizer in rice fields will have two effects on rice plants. One of them is that it is not conducive to root absorption. Rice roots are mainly distributed in the soil layer. While fertilizer floats on the water surface, the dislocation of this space will affect root absorption and fertilizer efficiency. The second is that the fertilizer particles floating on the water surface are dispersed and re-gathered by the wind, and then dissolved on the spot, which will cause uneven fertilization, make the population of rice plants irregular, and affect the fertilizer efficiency. In order to avoid floating fertilizer particles on the surface of the paddy field after fertilization, it is necessary to ensure that fertilization is in place, compound fertilizer and granular nitrogen fertilizer should be applied under the soil surface, so that the fertilizer and soil are mixed and covered with soil before irrigation.