The "double supplement" of bacterial fertilizer is not afraid of repeated cropping.

In recent years, with the increase of facility agricultural area and the extension of planting years, coupled with the inconvenience of greenhouse, greenhouse relocation and open field stubble, soil-borne diseases of facility crops such as strawberry and tomato are becoming more and more serious, which are closely related to crop continuous cropping. So, what are the reasons for the serious consequences of continuous cropping?

First, soil-borne diseases increase year by year to plant a crop year after year, resulting in an increase in the number of pathogens of one or more soil-borne diseases year by year, often leading to rotten roots and dead trees, which aggravates the difficulty of disease prevention and control; some immature organic matter contains nematodes, resulting in more and more nematodes in the soil.

Second, the lack or imbalance of nutrient elements due to crop preference for several nutrient elements, continuous cropping leads to the lack of preferred elements in the soil layer. Moreover, the re-application of phosphorus and potassium fertilizer causes the fixation of some medium and trace elements, resulting in a variety of element deficiency and the decrease of plant immunity, which is conducive to the infection of soil-borne diseases and aggravate the occurrence of diseases.

So, what measures should be taken to solve the problem of continuous cropping?

First of all, supplement the soil beneficial microorganisms. Beneficial microorganisms can kill soil-borne bacteria, repair soil microflora, and accelerate the release of phosphorus, potassium and trace elements fixed by soil. When applying base fertilizer, it is recommended that the base fertilizer should be 10kg / mu for Likang or 20kg / mu for Shilikangfudi, and Tukangyuan should be applied 3 times from seedling stage to flowering stage, each time 5 liters / mu, with an interval of 10: 15 days.

Secondly, improve the soil and increase the soil looseness. The acidified soil can be improved by applying 120 kg / mu of Holliyuan or Jigu'an bio-organic fertilizer or 80 kg / mu of Kangdi bio-organic fertilizer, 40 kg / mu of rich Taiwei calcium powder and 40 kg / mu of Jigu'an calcium powder to improve acidified soil and increase soil permeability. Reduce soil salinization.

Finally, the trace elements were supplemented by soil testing and balanced fertilization. The northern fruit tree areas are generally deficient in iron, zinc, boron, calcium and other elements. Hefeng Iron Ⅱ, Wefeng granule zinc, Hefeng granule boron, Futawei calcium powder and so on can be added when applying base fertilizer, and foliar spraying Hefeng iron Ⅱ, Hefeng zinc, Hefeng boron, fruit and vegetable calcium fertilizer and so on. Fruit trees in the south and protected vegetable areas in the north are easy to lack calcium, magnesium and molybdenum. Calcium and magnesium can be supplemented by bottom application of Futawei calcium powder and Futawei Wuhe magnesium, or foliar spraying Huide nutrient solution and Hefeng molybdenum to supplement magnesium, molybdenum and other elements. (agricultural guidance)