1. Choose varieties according to market demand
The varieties with more market demand should be the preferred varieties. This will not only satisfy the needs of the market, but also provide sufficient supply for the market and reduce the risk of planting, thereby increasing the economic efficiency of production. When introducing new varieties and exotic varieties, it is necessary to pay attention to doing a good job of market research, understanding and mastering the market's needs and development trends, and avoiding blindly introducing economic losses. Before the introduction of new varieties, small-scale tests should be conducted. After successful tests, demonstration and promotion will be conducted again.
2. Select varieties according to geographical environment
The geographical conditions formed by different geographical latitudes and altitudes are very different. The frost-free period at high latitudes and high altitudes is relatively shorter than that at low latitudes and low altitudes. At the same time, its thermal resources are not as good as those at low and high altitudes. Therefore, when selecting a variety, the geographic latitude and altitude of the source of the selected species should be ascertained. The varieties with similar geographical latitude should be selected as far as possible, and the growth period of the selected varieties should be close to or shorter than the local frost-free period, so as to avoid a serious reduction in production due to extension or shortening of the growth period due to the difference in latitude and altitude.
3. Select varieties according to ecological conditions
Ecological conditions are the environmental conditions for the growth of crops, including water conditions, thermal resources, soil texture, soil fertility, and geographical forms. The selected species should be adapted to the local ecological conditions. The ecological conditions are good, and the varieties with good fertilizer can be selected; if the ecological conditions are relatively poor, the varieties with tolerance to barrenness and strong drought resistance can be selected.
4. Select varieties based on the physiological characteristics of the crop
The physiological characteristics of different crops are different, mainly reflected in the sensitivity of the photoperiod, there are two types of long-day crops and short-day crops. When selecting foreign varieties, it is necessary to clarify the type of sunshine in the crop and avoid introducing failures. Long-day crops extend from the north to the south, and on the contrary, the growth period is shortened; short-day crops are introduced from north to south, and the growth period is shortened. On the contrary, the growth period is prolonged. For example, corn, rice, and soybean are short-day crops. The growth period from the north to the south is shortened, but the growth period is prolonged. Wheat is a long-day crop, and the growth period from north to south extends, but the growth period is shortened.
5. Select varieties according to the incidence of crops
The incidence of crops is affected by the local climatic conditions, the soil environment and the disease resistance of the crop varieties themselves. Production can be based on the occurrence of disease in the previous year or in recent years to select the appropriate species. In crops with severe disease occurrence in the previous year or in recent years, varieties with strong resistance to the same disease should be selected. If the incidence is lighter, you can choose the kind of disease resistance. In the selection of corn varieties, it is also important to note that the plots with severe head smut in the past must be selected for high resistance to head smut, in case the tr temperature of the head smut is high, it is very suitable Growth and reproduction. However, during the hot summer heat season, cooling measures should be taken to control the temperature of the trampoline within 30Â°C, which is the key to increasing production in summer. The following methods can be used:
(1) Shady shading: In practice, shading with curtains made of wheat stalks and rice straw is more effective than other methods (such as climbing plants, putting rapeseed pods, etc.). The shed is built to the south and low to the north, and the straw curtain is hung from the center of the shed, and the grass curtain is covered on the gong bed. It is best to cover the water hyacinth, water peanut and grass. After testing, when the temperature is 34Â°C, the temperature of the 6 cm below the surface of the boring machine is 30Â°C; the thickness of the peanut is 40 to 50 cm, and the temperature is 28Â°C; the old mat is covered only without a shed. The temperature is 35Â°C. Therefore, after the scaffolding, the trampoline is covered with straw curtains, and in particular, the water hyacinths and the water peanuts are cooled. Not only does the earthworm grow fast, but also the spawning capacity greatly increases.
2 Trampoline grass: When the temperature is getting higher, straw curtains must be covered on shady trampolines. It is best to use water hyacinths, water peanuts, and green grass.
3 watering cooling: the high temperature period must be watered once a day in the afternoon, in order to facilitate the night in a humid environment to climb to the trampoline surface foraging, conditional watering sooner or later twice better. Do not use very hot paddy field water or seriously polluted industrial wastewater. In the high-temperature period, the comprehensive cooling measures mentioned above, combined with the annual greening, can reduce the temperature of the trampoline to less than 30Â°C, so as to avoid the high temperature dormancy from affecting the yield.
In short, the conservation of earthworms should be based on the local climatic conditions, take appropriate measures to increase the temperature or cooling, making the trampoline annual temperature control in the most suitable range of growth and reproduction.
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