| Abstract: In order to solve the problems of continuous cropping obstacles in soil root zone caused by excessive fertilization of ginger, the differences of ginger plant growth, yield, nutrient element absorption, soil nutrient and soil enzyme activity in root zone of ginger under different topdressing amounts were compared using topdressing of N 17.4 kg, P2O5 10.2 kg and K2O 33.6 kg per 667 m2 as the conventional topdressing (control). The results showed that reducing the application of 20% could promote the growth of ginger plants and had a certain effect of increasing yield compared with the conventional topdressing, but reducing the application of 40% compared with the conventional topdressing could inhibit the growth of ginger plants and reduced the yield. Compared with the conventional topdressing, an increase of 20% could promote the growth of ginger plants, but it was not conducive to increase yield. The absorption of nutrient elements by ginger plants was K>N>P, in whichthe content of N and K elements in ginger plants was higher, and the content of P element in ginger
blocks was higher. Appropriate application of potassium fertilizer was conducive to the absorption and
transportation of potassium elements in ginger plants. Excessive application of nitrogen would not
accumulate in the soil, but excessive application of phosphorus and potassium fertilizers would enrich
in the soil. Excessive fertilization would lead to the decline of soil pH value and soil invertase activity,
and inhibited the decomposition of soil organic matter. Based on the production benefit of ginger, it
was suggested to reduce the application of chemical fertilizer by 20% compared with the conventional
topdressing. By appropriately reducing the application, the yield could increase, and the root zone
environment could be adjusted to achieve the effect of weight loss and efficiency increase. |