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Cotton bud-yellow 396a: a single recessive photoperiod-temperature sensitive genic male sterile line
1 Current status and problems of heterosis breeding and hybrid seed production 1.1 Hybrid seed production by manual or chemical emasculation and pollination This method is technically simple; any two varieties can serve as parents for each other, and hybridisation is achieved simply by emasculating at flowering and pollinating by hand. Chemical emasculation can also be used for hybrid seed production. Advantages: existing variety resources are easily exploited fully, the matching of hybrids is highly flexible, combinations can be configured freely, and some combinations can use the F2. Disadvantages: high labour intensity, high labour demand, high cost, and the heterosis of the F2 is often reduced compared with the F1. 1.2 Cyto
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Overwintering edible fungi: raise the temperature and maintain humidity
December is the busiest period for edible fungus production. Most cultivated varieties are fruiting, some that fruit in spring are in the mycelial growth phase, and some spawn is being made or is in the mycelial growth phase. With the arrival of December, temperatures drop, which is a considerable challenge for edible fungus growth. Therefore, mushroom growers must plan reasonably, manage well, and ensure normal growth of the edible fungi. Oyster mushrooms are mostly at the fruiting stage, and some cultivated in autumn have entered the tail end of fruiting. The focus of management is heat preservation, resolving the contradiction between raising the temperature and maintaining humidity in the mushroom shed and ventilation.
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Practical methods for raising water temperature when growing rice with well water
The biggest drawback of growing rice with well water is the low water temperature, which affects the good growth and development of rice, leading to reduced yield and poor quality. Therefore, raising the water temperature when growing rice with well water is crucial. The specific technical measures are: 1. Set up a solar warming pond to raise the water temperature. Adding a solar warming pond is an effective measure to raise the water temperature when growing rice with well water. The area of the solar warming pond should be based on actual conditions and adapted to local circumstances. Generally, the area of the solar warming pond should be 1500-2000 sq m, preferably reaching about 1/20 of the irrigation area of the pump. According to experimental research, 2
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The Effects of Different Temperatures on Pigs and Countermeasures
I. Effects of ambient temperature on pigs. 1. Effects on pig health. In a continuously high-temperature environment, the resistance of pigs is significantly reduced, the body heat balance is disrupted, body temperature rises, coma occurs, heat stroke develops, and in severe cases death results. In a low-temperature environment, in order to conserve heat, pigs constrict their peripheral blood vessels, causing local frostbite. Low temperatures cause respiratory diseases and also often lead to rheumatism, arthritis and other diseases. Low temperatures have a greater impact on piglets; according to statistics, half of the dead piglets were frozen to death or died from cold-related diseases.
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What is the relationship between rose blooming and temperature? Explained clearly in one article
Many floriculture references describe open-ground roses as: fond of warmth, with a blooming period from May to October, but this is actually inaccurate. After years of observation, the author found that the blooming period of roses is longer than this: it can last from May all the way to November, or even longer. It does not fear frost, and only after snow do the flowers and leaves gradually wither; if pruning is done a little later, it is even possible to enjoy roses in the snow. Roses like sun and fertilizer, but they are also tolerant of poor soil and drought, and their adaptation to temperature fluctuates over the course of a year. Although roses like warmth, they cannot tolerate intense heat. In the blazing summer, although roses still
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Key Management Techniques for Greenhouse Peach Trees Before Temperature Increase
I. Pruning To ensure a relatively good yield from greenhouse peaches, long-branch pruning should be adopted, keeping as many branches as possible and removing as few as possible. According to the space inside the greenhouse and the requirements of tree shape growth, while retaining 3-4 basic scaffold branches per tree, remove large branches that disrupt the tree shape, weak branches, non-flowering branches, diseased and pest-infested branches, overly dense branches, and crossing or overlapping branches; thin out or flatten the upward-growing medium and long fruiting branches; leave the extension branches unpruned; leave medium and long branches unpruned; and cut back the downward-hanging fruiting branches. The pruning amount should be controlled at about 10% of the total, so that after pruning each peach tree retains 8
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Practical methods for raising water temperature when growing rice with well water
The biggest drawback of growing rice with well water is the low water temperature, which affects the good growth and development of rice, leading to reduced yield and poor quality. Therefore, raising the water temperature for rice grown with well water is crucial. Specific technical measures: 1. Set up a sunning pond to raise the water temperature. Adding a sunning pond is an effective measure for raising the water temperature of rice grown with well water. The area of the sunning pond should be based on actual conditions and adapted to local circumstances. Generally, the area of the sunning pond is 1500-2000 sq m, and it is appropriate for it to reach about 1/20 of the irrigation area of the pump. According to experimental research, a 2000 sq m sunning
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Detailed Explanation of Variable-Temperature Germination Treatment Methods for Korean Pine Seeds
The Korean pine (Pinus koraiensis) is an excellent timber and food forest tree species in Northeast China. Korean pine seeds have a thick, hard seed coat with a waxy layer that is not easily permeable to water and air. The seed coat contains tannins, and other parts contain inhibitors such as abscisic acid. These factors affect the rapid germination of Korean pine seeds, keeping them in a long-term dormant state. To break the long-term dormancy of Korean pine seeds, under natural conditions, after the seeds mature, they must undergo burial through winter--summer--winter, and can only be sown when taken out in the spring of the third year. In recent years, due to the shortage of Korean pine seeds and high market prices, seed
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What to do when large silkworms are forced to mature prematurely by high temperatures? Do a good job of heat prevention and cooling
(1) In hot weather, prevent mulberry leaves from wilting and overheating. When feeding the silkworms, wait until the mulberry leaves have cooled before feeding. When feeding at noon, provide appropriate supplementary water to help cool things down and delay mulberry leaf wilting. This can be combined with supplementary feeding of miecanying or xiaoteling for disinfection. The standard for supplementary feeding of miecanying is 1 milliliter of miecanying agent added to 0.5 kg of water, fed with 4-5 kg of mulberry leaves, mixed evenly and then fed to the silkworms, with supplementary feeding once every 48 hours. The standard for preparing the xiaoteling agent water solution for disease prevention is to add 25 kg of water to each packet of the main agent. First use a small amount of water to
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Detailed Explanation of the Variable Temperature Treatment Method for Propagating Yew (Taxus) from Seed
The method for variable temperature treatment in seed propagation of yew is as follows: yew seeds have a double dormancy habit involving the radicle and the hypocotyl. The radicle requires a high-temperature stage above 25°C for about 1 month to break dormancy, while the hypocotyl requires conditions between minus 3°C and minus 20°C for about 1 month to release dormancy. To accelerate seed germination earlier, simply mix yew seeds with cracked seed coats with moist sand, place them in an environment below minus 3°C and freeze them for 25 to 40 days to release the hypocotyl dormancy. After sowing in late winter or early spring,
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