At present, rice or mid-season rice is successively undergoing jointing and booting stage, which is an important period for rice growth. Do you have any understanding of rice jointing and booting stage? Today, Xiaobian will help you to raise knowledge, detailing the physiological changes in rice jointing and booting stage and the eight stages of differentiation, to help you better understand the growth of rice grown by yourself.
Rice gestational booting stage is a period of vegetative growth and reproductive growth. In terms of physiological activities, on the one hand: vegetative growth centered on tiller and stem elongation, on the other hand: reproductive growth centered on the differentiation and development of young spikes. The growth of plants increased rapidly, the growth of roots also reached the maximum, and the longest leaves appeared one after another. After entering the booting stage, the leaf area of ​​the field reached a peak. At the same time, the young panicles rapidly differentiated and developed until the beginning of the earing stage, and the process runs through the entire booting stage. The process of rice panicle differentiation is briefly described as follows:
Rice panicle differentiation is divided into eight consecutive periods. The first four periods are called the young ear formation stage, and the last four periods are called the booting stage. The time required is relatively stable. The early maturing varieties are generally 25-28 days, the mid-maturing varieties are about 30 days, and the late-maturing varieties are about 33 days, with little change.
The first phase: the first stage of differentiation
The occurrence time is 3.5-3, and the field inspection can be determined by stripping. The development time is generally 2-3 days.
The initial stage of panicle differentiation (the first primordium differentiation stage) is a period of significant physiological changes. During this period, the growth center began to turn to the growth of young ears from the growth of axillary buds. The key points of nutrient distribution were transferred to the tillers and then transferred to the young ears. The characteristics of carbon and nitrogen metabolism were dominated by nitrogen metabolism and carbon and nitrogen metabolism.
In the field management that is cultivated to enter the ear differentiation stage, the above physiological transformation should be promoted through the management of fertilizer and water to reach the large stalk. During this period, the application of leaf color to promote flower fertilizer can increase the number of branches and spikelets. Judging this period during hybrid rice seed production plays an important role in early flowering prediction and regulation.
The second phase: the first period of differentiation
A branch is developing in the leafhopper, and the protrusion of the primordial branch can be clearly seen under the microscope. Occurred in the inverted three leaves of the tip, lasted 4-5 days. The mane can be seen with the naked eye.
The third phase: the second branch of the primordia and the differentiation of the primordium
In the lower part of the first branch of the primordial primordial, the second branch of the primordial primordia appeared successively, and the primordial primordium gradually appeared in the upper part. After the second branch was grown, the stalks were differentiated on the secondary branch. base. It lasted 6-7 days. The same fluff can be seen by the naked eye. This period is an important period for determining the size of the panicle.
The fourth stage: the stamen and stamen formation period
Occurred in the inverted two leaves, lasted 4-5 days. After the ear is peeled, the grain spikelets can be seen by the naked eye. Young ears are 0.5-1 cm long.
Phase 5: Pollen mother cell formation
It took place at the tip of the sword leaf and lasted 2-3 days. Young ears are 1.5-4 cm long. The granules of the granules can be seen with the naked eye.
Phase 6: Pollen mother cell meiosis
The flag leaf was completely extracted, and the leaf pillow and the inverted two leaf leaf pillow were flat and lasted for 2 days. The length of the glume is half of normal and the ear length is 4-10 cm. This period is a crucial period for determining whether Yinghua is fully developed and can be solid.
Seventh issue: the fullness of pollen content
At this time, from the external form of the plant, it has already "swelled", the ear length has been shaped, and the young ears have turned green, which lasted 6-8 days.
Eighth: Pollen completion period
The plant "bright belly" to the mouth of the mouth, lasted 2 days. In order to facilitate the memory of farmers' friends, according to the shape of young ears development, you can use jingles to express the visual results: one phase is invisible; the second phase is hairy; the third phase is fluffy; the fourth phase is grain; the fifth stage is The six-stage granules are half-length; the seven-stage stalks turn green; the eight-stage stalks will come out.
Eight stages of rice panicle differentiation
During the differentiation of rice panicles, it is affected by various factors, which are concentrated in the influence on the number of spikelets and the development of spikelets. The most influential factors are temperature, light, nutrients and water. Taking appropriate measures to avoid disadvantages in production, maximizing the production potential of the varieties and obtaining high yields is the central task of rice management.
The management of this period mainly includes:
(1) skillfully applying long-term ear fertilizer. Usually 4-6 kg of urea per acre, 15 kg of potassium fertilizer or 20 kg of compound fertilizer. Do not allow too much fertilizer to cause gluttony and late maturity.
(2) Fill in the "fostering water" and dry it in time. The panicle differentiation stage of rice is the period of rapid growth and water demand in rice during the whole life, and it is the weakest period of drought tolerance and cold tolerance. If the water is deficient, the young ears are affected, the pollen grains can not develop normally, and the nutrients are also transported to the panicles. It is easy to cause short ears, few grains, and more empty shells.
(3) Control pests and diseases. After rice jointing, pests and diseases are popular, sheath blight, bacterial blight, leaf blast, rice stem borer, rice leaf roller, rice borer, etc. are often harmful during this period, pay attention to timely treatment.
The above is the specific content of the eight stages of rice panicle differentiation. Although these contents seem a bit complicated, this is also to enrich farmers' understanding of rice. I hope that the contents of the introduction can help the farmers who grow rice!
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