First, the roots of the radish radish roots in the early stage of the expansion of soil drought, resulting in external hardening of the cortex, the internal cell growth is slow, adequate rainfall during the prosperous period, the secondary xylem parenchyma cells rapidly enlarged, while the periumenus sclerosis, swelling can not keep up and bursting of the skin Causes cracking. Occurred in uneven dry and wet, first drought after the cultivation of land. Countermeasures: Pay attention to watering evenly during the growth of radish roots and avoid drying off. Second, the root of radish is radish lateral root enlargement into "bifurcation" phenomenon. Its formation is caused by many reasons: 1 poor soil physical and chemical properties, shallow soil, and many gravel, hindering the normal growth of the main root, increased transmission of nutrients and ipsilateral roots lead to bifurcation; 2 the application of organic fertilizer is not fully decomposed The heat produced by the fermentation of fertilizers in the soil burns out the growing point of the main root and causes the growth of lateral roots. 3 The seeding is too dense, the seedlings are not timely, the radish roots are crowded, the main roots are bent, and the lateral roots are prosperously formed; 4 In the grass, etc. In agricultural activities, the main root growth point was damaged and the root was partially forked. Countermeasures: Select the soil with deep, loose fertile loam to cultivate radish, and pay attention to intensive cultivation; select high-quality decomposed soil and miscellaneous fertilizer as base fertilizer; sow after seedling emergence and time seedling and seedling. Third, the cruciferous autumn radish, in the high temperature and drought, before the wet and dry environment conditions, or sowing early and late harvest plots are prone to crooked phenomenon. The main reason is that the water supply is sufficient in the early stage of radish growth, and the main root normally grows and expands; in the late period, the drought or the supply of fertilizer and water is insufficient, resulting in heart failure. Countermeasures: radish cultivation should choose the soil deep, loose fertile loam, and in the radish "break belly" after the balance of fertilizer and water, to avoid uneven wet and dry, the main root fully grow and timely harvest. Fourth, black heart, black skin black heart, black skin mainly caused by two reasons: 1 black rot. After the radish flesh root was damaged, the symptoms in the outer and middle parts were not obvious. After the incision, the catheter was darkened, the internal tissues were dry rot, and the pith was mostly black and hollow. 2 Soil compaction, the application of organic fertilizer is not fully decomposed, causing microbial activity is intense, consume a lot of oxygen, resulting in radish root hypoxia caused black heart, black skin. Countermeasures: 1 appropriate sowing, avoid continuous cropping, avoid planting in low-lying land. At the beginning of black rot, 72% of agricultural streptomycin was sprayed at 3000 times, 7 to 10 days, and even sprayed 3 to 4 times. 2 intensive cultivation, to avoid soil compaction, the application of high-quality organic fertilizer basal fertilizer. Five, spicy radish during the growth of the process encountered hot, drought, lack of fat and other factors, leading to slow growth of the main root, small head, high mustard oil content and a strong spicy taste. Countermeasures: Rational fertilization to avoid prolonged drought in the soil. 6, improper bitterness and fertilization, partial application of nitrogen fertilizer and phosphorus and potassium fertilizer deficiency, radish root compounds containing nitrogen increased alkaline compounds, resulting in high content of bitter gourd and have a bitter taste. Countermeasures: Adopt nitrogen, phosphorus and potassium fertilizers, and do not apply nitrogen fertilizer. (Pingyin County Bureau of Agriculture)
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