Dongying City, Shandong Province, Mr. Qi (135****9270) May 11 Q: What happened in Lintian?
Wang Dixuan, vegetable division of Heshan District, Yiyang City, Hunan Province, answered: The stagnation of karyotypes is a new morbidity manifested in the main producing areas in Yilin in recent years. The incidence rate has continuously increased and the degree of occurrence has become increasingly severe. This has led to a significant reduction in production in some areas and even to loss. Continuous cropping for more than 4-6 years, the incidence is serious, continue to increase the trend of continuous cropping. The field that had not been planted with lotus roots was very light.
Control methods: Implement rotations or shorten the duration of continuous cropping. Normally, the rotation will be carried out for 2-3 years. The occurrence of deadlocks is light or absent. In areas where it is difficult to implement rotation, the duration of continuous cropping should not exceed 3-4 years. The establishment of improved breeding plots and the selection of improved varieties do not use sturdy pods as a breeding ground. It is also advisable not to use the non-rigid tadpoles for the cultivation of morbidity. Pay attention to the application of organic fertilizers so that both organic and inorganic fertilizers are given equal weight. Putian cultivated in winter and cultivated the fields. Before harvesting the plots that had been harvested in the past, plowing and stumbling in winter or planting green manure in order to reduce the reducing substances in the soil increased the nutrients that could be given, which would help prevent fossilization. Before planting, use lime and other drugs to disinfect the soil. If Tiantian is found dead, it must be completely removed in time. Remove dead stems, leaves, etc. Weapons such as attenuated vaccine N14 and satellite nucleic acid biocontrol agent S52 are used to prevent and treat morbidity.
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