Early preparation before planting, raise the temperature in advance
After the watermelon is planted, the first step is to expand the root system and absorb enough nutrients to promote rapid growth of stems and leaves. It is very important for the hair tree to be rooted and to create a good growth environment for the root system before planting. After planting watermelon in early spring, the primary factor affecting watermelon root growth is low ground temperature, especially some vegetable farmers still adopt the old habits, did not warm up before planting, pouring water after planting, ground temperature can not bring up for a long time, greatly affecting the slow seedling speed As a result, watermelons are not planted early, and even early aging seedlings appear.
Suggestion: In the 10-15 days before planting, the arch shed should be promptly on the new membrane to increase the temperature. After the new membrane is applied, the soil in the greenhouse is generally dry. Therefore, the water must be irrigated first, which can not only supplement the moisture in the soil, improve the soil moisture content, but also promote the melting of the frozen soil layer and avoid the deep soil temperature being too low. In general, it is better to keep the temperature of 10cm above 20°C when the watermelon is planted. If water is not poured in advance and water is poured after planting, it will have a great influence on the ground temperature. The root growth of watermelon is slow, which is not conducive to the slow seedling of watermelon, and it is easy to cause root damage.
Careful operation when planting to ensure that the seedlings are less injured
First of all, when it comes to planting, take root and prevent disease. In the course of transportation and planting, seedlings inevitably cause some mechanical damage to roots, stems and leaves, leaving wounds on the plants. This creates favorable conditions for the infection of pathogenic bacteria. If it is not controlled in time, it is easy to cause diseases after planting.
Suggestion: When planting, use azoxystrobin (Amisida) 1500 times or Hymexazin 2000 times, Zhongshengmycin 800 times with rooting agent (such as root Jia, swift rooting agent, shellfish Jia Ke Su, etc. ), root treatment of seedlings, can play a preventive role for the vast majority of fungi, bacterial diseases, but also to supplement the root nutrition, promote root development, slow seedlings have a good role in promoting.
When taking seedlings, you can use your fingers to pinch the top of the bottom of the nutrition bowl or pinch the bottom of the plug, and then remove the seedlings. In this way, the plug or nursery can be separated from the substrate and the root of the nursery in advance, and no effort is required to take the seedlings, which greatly reduces the risk of root and stem injury.
The method of colonization should be reasonable to promote the slow growth
First of all, colonization should be shallow. Most of the melon farmers in the colonization of watermelon seedlings, because of fear of water after exposure, rushing or rushing out of seedlings, generally planted seedlings deeper, which is not desirable. Because the ground temperature has a great influence on the seedlings in the early stage of the seedlings, and the ground temperature in winter has always been low, the deep ground temperature is even lower. Moreover, the soil with deep colonization is poor in the permeability of the soil and is prone to water accumulation, and it also has adverse effects on the growth of roots of watermelon seedlings. Miao is slow. Teacher Han suggested that, when planting seedlings, the nutrition should be slightly higher than that of sorghum, and that the nursery substrate can be seen after watering.
Second, colonization water should be small. At present, there are still many vegetable farmers who maintain the habit of pouring large amounts of water to plant seedlings after planting. This can be done at high temperatures in summer and autumn, but it is unreasonable to adopt this method when the temperature is low in winter. As mentioned earlier, pouring large water after planting will not raise the ground temperature in a short period of time, which will seriously affect the easing of watermelon seedlings, and it is very easy to cause water to cool.
Suggestion: After applying a new membrane, pour a little water about 10 days before planting so that we can ensure that the soil is moist when planting. After the planting, only water buckets, water pipes or micro-irrigation facilities are required to pour a small amount of water on each seedling to ensure that the soil around the planting hole is moist.
After planting, heat insulation to promote tree
In order to promote the early easing of the seedlings of watermelon, after planting all around the insulation, promote early vegetative growth, cultivating strong seedlings. Within one week after planting, as long as the temperature in the shed does not exceed 32°C, no ventilation is required. Only a small opening can be opened in the small shed to increase the temperature inside the shed, especially the soil temperature, and ensure that the minimum temperature at night is not lower than 12°C. Conducive to rapid seedlings of watermelon.
In order to increase the temperature of the greenhouse, multiple membrane coverage is an effective means. The general approach is, first of all, the bottom layer is the mulch, this film should not be covered after planting, generally about 10 days is appropriate. Next, a small shed is propped over each planting pod and covered with film-grass-membrane at night. The coverings are removed during the day. In addition, two layers of film are suspended from the lower part of the arch shed film by wire, and these two layers of film should be brought together to the edge of the shed during the day. Although this operation is troublesome, it can ensure nighttime temperatures in the booth and daylight. In addition, there are some other measures for insulation. Here we introduce the following: First, transform the shed structure; some vegetable farmers will dig the sheds slightly, and raise half a meter high earth walls on both sides of the shed to enhance the insulation capacity of the sheds. The second is that in addition to the fixed two membranes and three membranes, a layer of old straw curtains can be erected on both sides of the east and west sides or 1-2 layers of old greenhouse films can be suspended. Because the heat dissipation area is large and the temperature is lowered, special protection must be strengthened. Avoid excessive heat dissipation here. The third is to set up a cubicle at the entrance to avoid the direct entrance of cold air into and out of the doorway to enhance the tightness of the booth.
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