Effects Of Different Soil Control Methods On The Number Of Continuous Casting Population Of Ginger

Ginger(Zingiber officinale Roscoe)is a kind of spiced vegetable that is popular among Chinese people.However,due to the multiple factors such as insufficient per capita arable land and high technical requirements for planting,there is a continuous cropping phenomenon in ginger cultivation.Continuous cropping is the key factor leading to the occurrence and spread of soil-borne diseases and insect pests,which seriously affects the sustainable development of the ginger industry.Root-knot nematodes are one of the most commonly encountered diseases in ginger cultivation.Based on the ecological theory,this study takes the continuous soil nematodes of ginger as the research object.In 2015-2017,in the important production area of ginger in China-the Jinshan Dajiang Cooperative Plantation Base of Houshi Village,Dongxia Town,Weifang City,Shandong Province,Using the combination of outdoor potting,field experiment and indoor analysis,the relationship between the number of nematodes in rhizosphere soil and soil pH and nutrient conditions was explored,and different techniques such as chemical methods and biological methods were compared to continuous soil nematodes in ginger rhizosphere.Regulating role,in order to theoretically and technically regulate nematodes,to provide a scientific basis for the sustainable development of the ginger industry.The main results are as follows:(1)The results of pot experiment showed that when the soil was 6.44<pH?7.5,the difference in the total number of nematodes was not obvious;but when the pH>7.5,the total number of nematodes decreased.When 6.44<pH?7.5,the plant height and yield of ginger were not affected,while the plant height and yield of ginger were affected when pH?8.0 It is concluded that the change of soil pH can affect the number of soil nematodes in the rhizosphere of ginger,and induce the changes of ginger plant height and yield.(2)Different fertilization conditions have a regular effect on the number of soil nematodes.Among them,T1(NP treatment)had the highest number of parasitic nematodes,and T3(NK treatment),T4(NPK treatment),and T5(NMPK treatment)were lower than CK(control).It can be seen that potassium application can inhibit the growth of parasitic nematodes.The number of parasitic nematodes treated with Zn and T2(PK treatment)without nitrogen fertilizer was lower than that of other applied nitrogen fertilizers.It can be seen that the application of nitrogen fertilizer may lead to an increase in the number of parasitic nematodes in rhizosphere soil.The number of saprophytic nematodes in T5(NMPK treatment)The highest,and significantly higher than CK and T4(NPK treatment),it can be seen that the application of organic fertilizer may lead to an increase in the number of saprophytic nematodes in the rhizosphere soil.(3)During the two-year test period,the total number of nematodes,the number of parasitic nematodes and the number of saprophytic nematodes after soil chloropicrin fumigation treatment decreased significantly.Therefore,chloropicrin fumigation treatment is an effective way to control the number of soil nematodes.Control methods.On the other hand,the biological preparation alone was more effective in suppressing the occurrence of parasitic nematodes in the first year,but the effect was worsein the second year.Compared with the chloropicrin treatment alone,the chloropicrin fumigation treatment combined with the biological treatment method has a better effect on controlling the total number of nematodes,the number of parasitic nematodes and the number of saprophytic nematodes.Therefore,in the production process,the biological preparation should be applied after the soil is fumigated.(4)The application research on soil pH,fertilization conditions and control techniques showed that the number of parasitic nematodes in the rhizosphere soil increased with the passage of time,and peaked in September,and then parasitized.The number of nematodes is declining,so the prevention and control of ginger parasitic nematodes caused by continuous cropping should be focused on before September each year.