Radishes often cause many kinds of mental diseases under bad natural and planting conditions, which seriously affect their yield and moral character. The rare psychological diseases of radish and its prevention and control methods are introduced below.
1. Malformation roots. In the early stages of radish development, the main root development point is damaged or hindered, causing side root fat, meat roots diverging or constituting other types of deformities. According to the discussion, the skeletons of the Tatars easily constitute deformed roots: excessive rainfall or excessive irrigation to form soil compaction; the application of uncontaminated inorganic fertilizer or uneven fertilization; soil layering is shallow or there are hard stones under the root; underground beneficial insects are more, The main root of the seedling was bitten.
2. Cracking. The soil is boring for a long time, and the development of the roots temporarily stops. Afterwards, the rain or irrigation suddenly drops, and the roots develop rapidly and are prone to cracking.
3. Black or black heart. In the case of squat columns, it is easy to form black skin: solid soil, compaction, poor ventilation; application of novel manure fertilizers, intense movement of microorganisms in the soil, so that the Department of organizations due to lack of oxygen and the emergence of black skin or black heart. In addition, radishes afflicted with black rot, will also give rise to black hearts.
4. Hearty. The heart is agile and expansive, and the central delivery organization lacks a disease caused by boron nutrients. The lack of potassium in the soil, the excessive application of nitrogen fertilizer in the early stage of development, and the excessive development of leaf clusters can also cause heartbreak.
5. Spicy. The radish contains mustard oil. When its content is moderate, the radish has a good flavor. If the content is excessive, the pungent flavor is heavy. When the weather is very hot, drought, or lack of inorganic fertilizer, it is easy to increase the mustard oil content in radish.
6. Bitter taste. Radish in the course of development, when the weather is too hot or the application of nitrogen fertilizer is excessive and phosphorus and potassium fertilizers are lacking, a nitrogen-containing alkaline compound, bitter element, is prone to occur in the roots of the meat, so that bitterness appears in the radish.
7. The lack of disease. Nitrogen deficiency, short plants, slow development, narrow and thin leaves, yellowish leaves, weak stems, irregular root development, fine and small, many lignifications, increased pungency; lack of phosphorus, purple backs, small leaves Stretching, the fleshy roots are not flourishing; in the absence of potassium, dark green leaves appear in the middle of the leaves, and the leaf margins are curled. They are pale yellow to brown, and the lower leaves and petioles show yellow to bronze. The leaves thicken and the roots do not expand normally.
Prevention of radish psychological diseases, planting should accept the following methods:
1. Use excellent types. The types that are usually shallow in soil are not prone to deformed roots; those that contain less water and those that are dense in the meat are not prone to cracking; the types of white or white skin are lighter in terms of bitterness and bitterness.
2. Choose a suitable plot. Before planting, choose a plot of deep soil and plow deeply to make the soil loose.
3. Superstitious increase fertilizer material. The inorganic fertilizer applied to the soil must be fully decomposed and thoroughly dispersed. At the same time, phosphorus and potassium fertilizers should be appropriately added to avoid the need for a single application of large amounts of nitrogenous fertilizers. In comparison with the year-old plots, boric acid or borax is used every 667 square meters for site preparation. 0.5 ~ 1kg, and in the straight root swelling with 0.2% ~ 0.5% borax or boric acid solution foliar spray, spray every 3 to 4 days, and even spray 3 to 4 times.
4. Fair watering. Avoid drying or dampness or excessive humidity.
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