According to information, cotton roots are the first to break out of the skin and are called “germinating†or “germinationâ€. Farmers are commonly known as “whitening†or “rootingâ€. Afterwards, the breakage of the cotton seedlings to the spreading of the two cotyledons is called "emergence." It takes about 10 days from seed germination to emergence, during which the cotton roots grow an average of 1 cm per day. When we see the cotton seedlings in the ground, its root length is more than 10 cm, which is 2 to 3 times the seedling height. After the cotton seedlings have been unearthed, photosynthetic products can be produced, and the cotton roots grow faster. The average daily elongation is 2 cm in more than 30 days from the bud emergence, and the growth rate is much faster than the daily elongation rate of the plants. During this period, a primary lateral root was also produced on the main root, and secondary lateral roots were then generated on the primary lateral root. By the budding stage, a well-developed root system can reach depths of up to 1 meter and lateral root growth up to 0.5 meters.
It can be seen that the two laws: First, the seedling root depth is much greater than the seedling height; Second, the seedling root growth rate is much faster than the plant.
The above is the general law of cotton root growth, but whether the root can grow robustly depends on the soil environment. In addition to having good nutritional conditions, it must also have certain calories, moisture and ventilation conditions. Cultivated cultivation is the main measure to promote the development of cotton roots, but in recent years farmers' tube cotton has become more and more of a plan and it is rare to see cultivators before the seedlings. In fact, the first cultivator can be started after the sowing is completed, and it is not necessary to wait until the seedlings are flushed. The earlier the cultivator, the better the conservation effect and the greater the possibility of raising the ground temperature. At the same time, the farm work is not busy, and the time is more calm. After the rain, timely cultivating and loosening of the soil should be carried out to remove the compaction. Once the surface becomes dry and hard, it is difficult to carry out cultivating. The cultivator must be deepened successively, the cultivator method should be the first to push the machine, and the province should be man-made with high efficiency and good quality.
Seedling tillage can also prevent and control the emergence and development of cotton blight. After suffering from blight, cotton seedlings often cause dead seedlings and severe dead seedlings. It is mainly caused by Rhizoctonia solani infection. When the soil temperature is low, humidity is high, and three ventilations are not prepared, it can easily cause the spread and outbreak of the disease. Therefore, after the emergence of blight seedlings, the removal of membranes and the spraying of fungicides were not effective. The only feasible solution was to immediately conduct inter-row cultivating to increase the temperature of the soil, aeration, and dehumidification, and at the same time preserve the underlying soil moisture and promote root system Zha, lateral roots with early hair, roots and necks are lignified as soon as possible, and the condition of naturally occurring dampness is naturally reduced.
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