Hello, everyone. I'm chief springs. As the northerners eat pasta, the southerners eat rice, and the rice we eat is the food we eat most often, so rice cultivation is also essential. In addition to the southern rice, today's mini-editor tells you about some of the knowledge about the drought, the technical nature of dryland breeding and the management of the seed season。
I. Basic key points in dryland breeding techniques
There are several basic key points for dryland breeding techniques:
First, it increases the temporal relativity of the seedlings to the point of growth at extreme temperatures that divide each leaf. In this way, the opportunities for the creation of fractions of the sub-bases in each leaf armpit have been raised, laying the foundation for the multi-partization of early fractions after the plug. As a result of temperature manipulation, the vertical growth and development of seedlings is reduced, so that they are small and strong。
Second, give the roots enough co2. The growth and development of roots must be co2 and inter-co2 with good hair and many roots, with more roots, and roots capable of working under and above the roots of the leaf, thus contributing to the resilience of small seedlings。
Finally, it is important to grasp the important aspect of preventing deadness. Stereosis is a key pest of early breeding and a problem of success and failure. There are many test sites that promote the failure of drought breeding and, in addition to the failure to create a technical management system suitable for drought breeding standards, the key reason is inadequate disease prevention techniques. Thus, for early childbearing to succeed, it is essential to adopt a proactive and reasonable response to remove or minimize the damage caused by detached diseases。
Ii. Methodology of methodology
1 temperature management method. The 6-8 days of non-natural ventilation, without irrigation and suitable for a temperature of 40-31°c, which is a closed period, are crucially designed to raise the temperature in the bed and contribute to the gerontization. Early natural ventilation should take place during a closed period when the temperature is high and the seedlings come out early. In the event of extremely low temperatures, low temperatures in the bed and delays in the release of earth objects from seedlings, the sealing period can be extended until the seedlings have a full base and natural ventilation occurs when all the gardens are greened。
Natural ventilation occurs by decomposing the plastic sheeting on both sides of the bed and lowering the temperature to 20°c and at noon. Natural ventilation of seedlings is necessary during this period. The first leaf is covered by drought, with a length of less than 3 centimetres, and a larger leaf means a steep seedling. Natural ventilation during the greening of the garden is a critical time in which to manipulate the distance and is a sensitive time in which to make decisions about the size of the seedlings. The seedlings are maintained at 30 °c after 1. 6, up to a maximum of 20 °c. If the temperature is high to increase natural ventilation, the membrane can be removed from both sides of the bed until all is released and covered at low noon temperatures. When the seedlings are 2. 3 leaves, care is taken to keep the seedlings below 30°c. When the night is above 13°c, the day and night are naturally ventilated, but when the frost falls, it is covered. The plastic film can be removed 3-4 days before planting. Small, sturdy and drought-resistant seedlings that undergo hyper-temperature exercise do not easily cause significant harm even when they encounter extreme temperatures or frost。
2 water management methods. The soil layer is more hydraulic, the bottom water is abundant and does not require piped water for 16 to 20 days after planting. However, due to the lack of bottom water and the low capacity of the soil layer to lock water, if there is less water disease, it must be poured. The symptoms of water scarcity are: drying of the bed surface in the morning and evening, curling of leaves at noon, no drops at the tip of the leaves in the morning and evening or small drops. One of the most frequently said problems is that it means that less water must be poured immediately. It is desirable that the irrigation be carried out in the morning, after which the temperature of the bed can be increased by long periods of daylight, to prevent ultra-low temperature injuries at night. In the latter part of the pregnancy, 2. 3 leaves are born because of the size of the leaves, the volatilization of the leaves and the lack of water. Irrigation must be filled with water, otherwise the seedlings will only be laid on the more abundant surfaces, which, after which they will have to be watered on a regular basis, will not only take time, but will also result in the precipitous growth of the seedlings and the creation of “fake droughts”. The manipulation of seedling water, which is a key response to early growth, is a fundamental difference between dry and water breeding, which can only be tightly controlled and which can make the secret seedling jars strong, solid and heavy, thus raising the weight of the dry material, thereby raising the well-being of the young。
The norm of drought in the cold is that the height of three centimeters is not more than 12 centimetres, the length of the first leaf is not more than 3 centimeters, the stairwell is flat, the band is split, the leaves stand up, the seedlings are proliferating, they are inserted back to green, their hair is strong and they are resilient. For every 150 seedlings, a portion of the earth is dry about 3g。
3. Prevention of pests and diseases
Stand dead. Paraquat is usually divided into two types, which are pathogen and rational. The key to the emergence of morbid atrophy is that the natural environment standard is the growth and development of seedlings, which adversely affects the growth and development of the fungi by intrusion into the roots, shrinking roots and death of the whole seedling. The time of the onset was the guillotine. The leaves were fiber-shaped at the time of the outbreak, slowly turning yellow and then starting to rot from near the earth. When the leaves are removed gently, they can be removed from the soil layer, and the soil layer seeds produce fresh red or dark purple yogurt-like strains, which have a palatable taste, beginning with a partial sticker and spreading slowly to the surrounding area. This can occur when average temperatures change significantly, at very low temperatures and growth and development are stagnant. Physiological atrophy: the leaf closes fast at the onset of the seed, the light green turns to brown, a part of the earth close to the ground is not broken, and it keeps green, five-tooth-stealing energy, pulls it out together with the root, produces small pieces, and the disease is left in ruins。
For this reason, the cultivation of dry rice seedlings and the prevention of degenerative diseases require the strict application of the basic operational requirements for the prevention of drugs throughout the pre-planting process. The best drug today for the prevention of adhesion is the encordant, which is administered in the form of 13 days after planting, when the seedling grows to the point of a leaf, 75 per cent of the ecstasone 1 g per square metre, water 1kg, water solution, sprayed on the surface of the bed in a dizziness symmetrical form, and a small amount of water to keep it wet, so that the water can seep into the roots of the seed. It is also possible to mix the enzymes into 150 times more clean soil or sand and spill them over the bed. If there is no necrosis at this time, it can be applied at the onset of the disease, and it can be filled with several permeable treatments. Keep an eye out for good medicine at noon on big weather. Shrimp. It was found that yellow seedlings were sprayed with 150 times more iron sulphate solution and 4 grams of iron sulphate per square metre。
The above is an example of how dry seedlings are grown and how to treat the disease. If there are any other suggestions, they can be discussed on the message board。
