Preparation for preventing and controlling tobacco black shank and continuous-cropping tobacco planting method capable of preventing tobacco black shank

[0021] Embodiment 1: a kind of continuous cropping tobacco planting method with preventing tobacco black shank, comprises the steps:

[0022] (1) Soil improvement: 30 days before transplanting tobacco seedlings, apply 50kg / mu of tobacco black shank prevention and control agent on the surface of the soil layer, and then deep plow the soil;

[0023] (2) Chemical treatment: Tobacco seedlings of Yunyan 85 are sprayed with 8 mg / mL chitosan 5 days before transplanting, and hymexazol is used to dip the roots when transplanting. The transplanting depth is 6-8 cm, and the row spacing should be about 120 cm. , with a spacing of about 50 cm; then on the 15th day after transplanting, dilute the preparation for preventing and treating tobacco black shank by 500 times, and then irrigate the roots.

[0024] (3) In the middle and later stages, spray a carbon-based chelated organic fertilizer foliar fertilizer and a fungicide once. Described bactericide is 72% cream eye navel manganese zinc,

[0029] Embodiment 2: the difference with embodiment 1 is:

[0030] A preparation for preventing and treating tobacco black shank, which consists of the following components: 87 parts of slow-release compound fertilizer, 30 parts of biochar, 12 parts of compound bacterial agent, and 15 parts of vermiculite.

[0031] Embodiment 3: the difference with embodiment 1 is:

[0032] A preparation for preventing and treating tobacco black shank, which consists of the following components: 87 parts of slow-release compound fertilizer, 40 parts of biochar, 8 parts of compound bacterial agent, and 15 parts of vermiculite.