In recent years, the phenomenon of death of carnations in Kunming in the summer has been serious. Many disputes between the producers of seedlings and farmers have not stopped. Why are carnations grown in summer more dead? I will talk about this topic on this topic for the reference of the majority of flower farmers.
The living environment is very different and the seedlings are exposed to adverse conditions
After inserting the carnation cuttings into the seedbed, it is necessary to artificially create good conditions to make it full of vitality, to produce a root primordial as soon as possible, and to initiate a robust root system. Seedlings planted in Daejeon, although their roots can absorb water and nutrients to a certain extent and keep their organisms alive, seedlings cannot adapt to the external environment in a short period of time, especially in the case of seedlings with poor quality .
In addition, the temperature rises rapidly after June. The plastic bamboo shed in the contiguous piece is like a hot summer day. The temperature exceeds 30°C, and the weather is often rainstorms and storms. This makes bamboo sheds, which are low in size, more like a steamer, hot and humid. Bad ventilation. This kind of weather forced the seedlings to increase in transpiration, enhance respiration, lose nutrients in the body, add too much water at the seedling stage, have high water content in the soil, low oxygen content, new roots are not long, old roots have weak adsorption capacity, and artificially caused poor seedling growth. The environment has caused the death of seedlings to increase.
Repeated work for many times, the surface salt is high and the disease is serious
The flower growers who have planted carnations know that the planting in the new planting area has low seedling mortality rate, strong growth potential, good cut flower quality, and low production costs. If several kinds of soil were planted and no carnations were continued, the carnations continued to grow continuously. The mortality of the seedlings was significantly increased, the growth was weaker, the frequency of fertilization and application was increased, the production cost was increased, and the quality of the product was reduced. This is the reaction of carnations against continuous cropping. .
Carnations need a lot of nutrients throughout the growth period, and the soil can easily cause effective nutrient deficiency in the short term. The supplement of nutrients is partly provided by fertilization, and the other part is released by the soil itself. If carnations are continuously planted, the soil will inevitably produce nutrients, inhibit the absorption of effective nutrients, cause poor plant growth, and create conditions for the spread of pathogens. In the case of the same pathogen in continuous cropping, the pathogenic base number is expanded, and a suitable adverse environment is encountered. The pathogen spreads and spreads, and plants are harmed on a large scale. If the prevention and metallurgy are not timely, it will inevitably cause large plant deaths.
Carnation, from its entire growth process, has a certain degree of salt resistance, especially in the middle and late stages of growth, when the soil surface salt content is about 0.2%, it generally does not cause salt damage. However, in the early growth stage, the stem base and root system are young, the degree of lignification is low, the salt resistance is relatively poor, and the salt content in the soil surface is 0.2%, which has been detrimental to plant growth. In recent years, there has been a history of paddy-upland rotations. The majority of carnations have been used for many years in plastic sheds, and the amount of salt in the soil surface has increased with the accumulation of multiple cropping indices and fertilizers. Therefore, some carnations are prone to physiological drought and ion poisoning at the seedling stage, destroying normal metabolism and causing various physiological diseases. Such as carnation seedlings stem base rot, it is the surface of the soil salted stem base, for the tip of the Fusarium bacillus to open a convenient door, resulting in physiological diseases turned into infectious diseases. Caused a large number of deaths of carnation seedlings.
Low seedling quality, poor resistance to reverse
After the carnation seedlings are planted, the survival rate is directly related to the quality of the seedlings. At present, there are indeed cases where the purchase of inferior seedlings leads to a high rate of dead seedlings. Therefore, the majority of flower farmers must have the ability to identify high-quality flower seedlings. Quality seedlings should have:
1. The roots are well-developed, and the cleanliness of the leaves is high. There are no spots, and the seedling age is moderate. The general seedling age of 25-30 days is appropriate, with 2 to 3 pairs of single leaves, the flower bud rate is less than 5%.
2. The flowering effect and stress resistance of the varieties are better. The stress resistance mainly refers to the ability to fight fungi, bacteria, and resistance to heat and frost.
Improper fertilization at seedling stage
The carnation seedlings used in production are basically cutting seedlings. Their roots are young, and their water content is high. The resistance is far less than that of seedlings. After planting, the root system grows slowly and is vulnerable to diseases and insect pests. The seedlings planted for about one month showed that all the roots were not mature. Most of the seedlings were in Changxin root. During this period, the seedlings had weak resistance to fertility and poor salt resistance, especially for poorly rotted farmhouses. However, some flower farmers do not speak about science and use uncontaminated manure water earlier. As a result, the tender shoots that require cleanliness in the rooting environment are more detrimental. It can rot the rooting cuttings soon. For this reason, fertilization should be done carefully during the seedling period of carnations to avoid causing a large number of deaths at seedling stage.
In short, the causes of the death of carnations in summer in Kunming are various, some are caused by single factors, and they are caused by a combination of multiple factors. Farmers in the actual production should carefully sum up, to identify the main reasons for the contradiction, the right medicine, summer cultivation of carnations dead seedlings phenomenon will be limited.
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