Many cotton growers have the habit of breaking the membrane during the cotton bud period, and use more machinery. Promote the soil surface of Xiaoxing to disperse the soil, which is beneficial to the root system, and at the same time combine the cultivation between the large rows. Some farmers worry that the cotton plant will grow taller and the small row can no longer operate. They want to take advantage of this opportunity to apply chemical fertilizer between the small rows and complete multiple operations at once. This is not feasible.
1. Restricted by the width of the plastic film, the actual width of most small rows of cotton fields is only about 45 cm. Except for the dry and thin land, the upper part of the side of the small row of cotton plants and the root system are weakly developed, especially under the cover of the plastic film, the root system is shallow. Topdressing fertilizer in a small row can easily damage the root system and cause fertilizer waste.
2. It is difficult to ensure that the mechanical operation between 45 cm is exactly in the center, offset by a little or so, or the amount of fertilizer is uneven, especially the rain after fertilization, it is easy to cause fertilizer damage to seedlings. There are many lessons in the past.
3. The cotton bud stage is a period of strong root growth, which requires the aerial part to grow stably. At this time, the top dressing is early.
4. Some farmers believe that top dressing is as close as possible to cotton plants, which is a misunderstanding. The functional zone for cotton roots to absorb water and nutrients is the apex of the main root and lateral roots, which is less than 10 cm from the root apex, which is the position far away from the cotton plant. In the current flourishing period, the main soil root depth of cotton has reached more than 100 cm, and the lateral root lateral expansion has reached more than 50 cm. Even if the large row spacing is 90 to 100 cm wide, the roots of the two rows of cotton plants are connected.
5. When soil top dressing is needed, the best time and method should be at the flowering stage in the cotton field, or applied to the middle of the large row at the beginning of flowering, with a depth of about 10 cm. You can refer to the specific conditions of the cotton field during the operation.
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