Do potatoes germinate and grow at MINUS three degrees? Potatoes do not germinate and grow at MINUS three degrees, and the optimum temperature for tuber growth is 16℃~ 18℃. When the local temperature is higher than 25℃, tuber growth stops. The optimum temperature for stem and leaf growth is 15℃~25℃, and it will stop growing when it exceeds 39℃.
1. Sleep period
After harvesting, potatoes can not germinate for a long time in an environment suitable for germination, which belongs to physiological natural dormancy and is an adaptability to adverse environment. When the top of stolon stops polar growth and tuber begins to swell, tuber dormancy begins. The length of dormancy period is related to the storage of tubers and whether they can emerge in time after sowing, so it is also related to the yield. The dormancy period of potato is greatly influenced by storage temperature. Under the condition of about 26 degrees Celsius, the dormancy period varies from 1 month to more than 3 months due to different varieties. Potatoes can stay dormant for a long time at the temperature of 0-4 degrees Celsius. The dormancy process of potato is determined by the direction of enzyme activity and closely related to environmental conditions.
2. Germination stage
The growth of potato begins with the germination of buds on tubers. Buds and seedlings can grow obviously only when tubers are released from dormancy. The germination period is from germination to emergence, and the first section of the main stem grows. The growth center of germination stage is bud elongation, rooting and stolon formation. Nutrition and water mainly depend on seed potato, which is supplied in the order of stem, leaf and root. The speed and quality of growth depend on potato seeds and the environmental conditions required for germination. The growth time varies from 1 month to several months due to different dormancy characteristics, cultivation seasons and technical measures.
3. Seedling stage
From emergence to the flattening of the sixth or eighth leaf, the growth of 1 leaf sequence is completed, which is called "clump tree", which is the second growth stage of the main stem and also the seedling stage of potato. The seedling stage is short, whether it is spring or autumn, it is only half a month.
4. Tree emergence stage
From the cluster to the twelfth or sixteenth leaf, the early-maturing varieties bloom in the first inflorescence; Late-maturing varieties bloom in the second inflorescence, which is the flowering period of potatoes and lasts about 1 month, which is the growth of the third segment of the main stem. The main stem began to rise sharply in the growth period, accounting for about 50% of the total height; The main stems and leaves have all been built, and there are expansion packages for branches and branches. The root system continues to swell, and the tuber expands to the size of pigeon eggs. There is a turning stage of growth center at the seedling stage of trees, and the end point of the turning stage is that the ratio of stem and leaf dry matter to tuber dry matter reaches balance.
5. Potato growth period
That is, the tuber formation period. After the completion of the tree growth period, it will enter the tuber-bearing period with tuber growth as the main factor. During this period, the growth of stems and leaves decreased day by day, the basal leaves began to turn yellow and wither, the organic nutrients in various parts of the plant were continuously transported to the tuber, and the tuber expanded rapidly, especially on 10 day after flowering. The duration of potato seed setting is controlled by climatic conditions, diseases and variety maturity, generally 30-50 days.
Growth condition
Potato planting area
Potato likes to be cold and cool, and it is a crop that likes low temperature. The formation and growth of underground potato requires a loose, breathable, cool and moist soil environment.
Temperature requirements for potatoes: the optimum temperature for tuber growth is 16℃~ 18℃, and when the local temperature is higher than 25℃, tuber growth stops; The optimum temperature for stem and leaf growth is 15℃~25℃, and it will stop growing when it exceeds 39℃.
The potato was introduced into China only 300 years ago. It is said that it was introduced from Southeast Asia by overseas Chinese, and the potato planting area in China ranked second in the world in 2 1 century. Potato has high yield, rich nutrition and strong adaptability to the environment, and now it has spread all over the world. Tropical and subtropical countries can plant and obtain high yield even in winter or cool season.
Why do mung beans germinate faster than soybean sprouts? Different varieties
Different DNA sequences
Lead to different growth habits ...
It cannot be said that beans germinate at the same time.
The relationship between the growth of terminal buds and the growth of lateral buds is (a). The roots of lateral buds grow as fast as those of terminal buds. B. the growth rate of terminal buds is the same as that of lateral buds. C. the phenomenon that the top growth is dominant is called the top advantage. Principle: The auxin formed by the terminal bud is transported downward, which increases the concentration of auxin near the lateral bud and is inhibited because the lateral bud is sensitive to auxin. At the same time, the top with high auxin content absorbs nutrition from the lateral buds, which leads to insufficient nutrition in the lateral buds. C is correct.
So choose: C.
If the growth rate of terminal buds is faster than that of lateral buds (but the growth of lateral buds is not inhibited, but the growth function is weakened), it is not called terminal advantage, of course not.
The apical advantage is that the terminal bud is long and the lateral bud is inhibited.
What method is used to make bamboo roots germinate and grow quickly? Bamboo is most suitable for growing in subtropical areas, where it is humid, mild, sunny and short in winter. Especially in this environment, bamboo growing in ravines, rivers and Qiu Ling is very robust and is the best paper-making material.
1. Water-controlling bamboos love moisture and are afraid of stagnant water. After pouring the basin, it should be watered for the first time, then keep the soil moist, and don't pour too much, otherwise it will easily rot the whip and root. From pot filling to survival stage, water is often sprayed on the leaves. If the basin is short of water, the bamboo leaves will curl. At this time, water them in time, and the bamboo leaves will unfold again. 65438+ water once every 0 to 2 days in summer, and water less in winter, but ensure that the basin soil is moist and prevent "dry freezing".
2. Fertilizer management Potted bamboo fertilizer is mainly organic fertilizer mixed with pot soil when potted. After bamboo survives, it should be properly topdressing, "thin fertilizer should be applied frequently", and 0.5% urea or 1.0% compound fertilizer should be applied to spring and summer water.
3. The main pests and diseases are aphids and scale insects, and 80% dichlorvos emulsion or 40% dimethoate emulsion can be sprayed 1000 times; The main diseases are sooty blotch, witches' broom and so on. Management should be strengthened and diseased plants should be pruned in time.
4. In other hot seasons, potted bamboos should be moved to the shade to avoid exposure in the hot sun. And spray water on the leaves to keep them green. In winter, potted bamboo should be moved to the leeward or indoors. The potted time of loose bamboo is better in February and March before bamboo shoots appear in spring, June and May and 10 in autumn, and February is the best for ground cover bamboo. Because bamboo shoots are produced in summer and autumn, it is best to produce bamboo shoots in spring from March to May.
How can mung beans germinate and grow better? Soak mung beans for one night until they swell (or soak them in water before going out in the morning and start sprouting after going home in the afternoon); Spread the soaked beans on the bottom of the teapot (not too much, it will be hairy);
Pour out the water, cover it and put it in a warm place. When the container is in a humid environment, mung beans germinate (let the beans have enough humidity, but don't let the beans soak in water);
Wash it with clean water every 4-6 hours. Remember: be sure to inject clean water from the teapot mouth, and then discharge the water from the teapot mouth, so as to ensure that there is no sunlight in the whole process (don't be too curious, be sure to open the lid);
Mung beans germinate quickly. Small spots appeared on mung beans on the first day, about 2-3cm the next day, and almost harvested on the fourth day.
Rinse the floating bean shells with clear water, blanch the bean sprouts in boiling water, and add minced onion and ginger, pepper, salt, sugar, vinegar and sesame oil according to your own taste.
What fruit seeds germinate fastest? In the process of plant germination and growth, fruit seeds germinate slowly. The fastest sprouting seed is mung bean, which can germinate after being treated and soaked in boiling water for about 10 hour.
The process of garlic germination and growth The planting season of garlic is at the beginning of 10, and the weather is getting cold, so water it in time after sowing. After an interval of two days, cover it with plastic film. It can moisturize, kill insects, increase the growth of garlic seedlings, and protect against cold in winter.
After a week, garlic will slowly show its small inner buds. At this time, it is necessary to help garlic seedlings break through the plastic film and dig a small hole in the plastic film.
Let the garlic germinate slowly. This work will last for several days until all the garlic germinates. Garlic seedlings will stop growing in winter and will not continue to grow until the following spring.
Why can't seeds germinate and grow deep in the soil? It's too deep!