From the beginning of the radish fleshy roots, after 20-30 days, the radish has entered the root swelling period. One of the most important management measures in this period is pest and disease control. After the radish's fleshy root enters the swell phase, the early-growth leaves have entered the ageing period. These leaves will cling to the soil and will yellow and even rot. Once the radish plants are found to produce yellow leaves, they must be removed promptly. If we find that the leaves of radish appear yellow-brown lesions, it means the radish is infected with downy mildew. For the prevention of downy mildew, metalaxyl 500 times solution can be used to spray the affected plants once a week. If the radish is found to be harmed by cabbage caterpillars, it should be sprayed with Bacillus thuringiensis 500-800 times, usually once a week, after 2-3 times to achieve control effect.
Radish root cracking sometimes occurs in the radish root swelling period. The main reason for this phenomenon is uneven water supply. If the high temperature and drought in the early growth period of radish and insufficient water supply will lead to aging of cortical tissue in the root of the fleshy root. In the middle and late stages of fleshy root growth, the temperature is appropriate and the water is sufficient. At this time, the flesh xylem parenchyma cells re-expand, but The skin cells have not been able to grow accordingly, and as a result, the phenomenon of cracking occurs. Some of the roots of the fleshy roots are cracked longitudinally along the roots of the fleshy roots, while others are transverse to the petiole, and some are radially cracked at the roots. The emergence of roots not only reduces the yield and quality of radish, but also makes the radish rot easily and is not resistant to storage. The main method for preventing the disruption of fleshy roots is to provide a balanced supply of water so that the soil maintains a certain degree of humidity, and the soil must not be excessively dry or too wet.
In the late growth stage of radish, there is also a malformation of the fleshy root, which is also known as the root of the root. The root of the dislocation arises from the fact that the growth root of the main root is damaged or the growth is hindered and the lateral root expands. In the disorganized roots, due to the different degree of lateral root hypertrophy, they can be divided into two types: one is that the main root is in the elongation period, replaced by 2-3 hypertrophied lateral roots, or the main root and several lateral roots are hypertrophied at the same time; The main root is reserved while the lateral root is slightly enlarged. The root cause of dislocation is: the soil is too hard or there are stones in the soil, the roots of the flesh cannot be gradually squashed, and the roots of the lateral roots give rise to protuberances. After this protuberance expands and develops, the dislocation roots are formed; the unfamiliar farm manure is applied. The root of the fleshy root is tied to the fertilizer. Burning root damage occurs, and it cannot continue to grow. It is also a cause of the formation of radish roots. Therefore, we mentioned in the preparation of the planting area that the soil should be deep-rooted, deepen the living soil layer, and be flattened and fine-grained. There should be no need to leave scum, remove stones, and it is necessary to apply the farm manure to fully decompose these measures.
Heartburn is another reason that affects the quality and taste of radish. The main reason for the emergence of radish is water imbalance. In the root enlargement period of radish, the absorption and transpiration of the radish plant is the most vigorous, and the water consumption is large. If the temperature is too high at this time, some of the thin-walled cells in the root of the flesh will lack nutrients and moisture and cause heart failure. . Therefore, in the radish root swelling period if no rain to water once in three days, this can effectively prevent the occurrence of carrot heart. The radish has a large amount of growth during the root enlargement period. Therefore, in addition to sufficient water supply, it is also necessary to apply fertilizer once a week. Diammonium phosphate and urea can be used for fertilization. The application ratio is 1:1. The application rate is 20 kg per 667 square meters. Fertilization can be carried out in conjunction with watering.
In October, when the radish roots are sufficiently fat, they can be harvested. In order to increase the moisture content of the radish, the radish should be watered 3-5 days before the harvest. The amount of watering should be larger, it is best to make the soil wetting layer reach 30 cm, so that the water content of radish roots reaches 80%.
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