Since last year, the farmer has expanded cotton planting area and contracted 60 acres of cotton fields in the village. As the area of ​​cotton fields has been expanded, the soil fertility basis of different plots is different, and the specificity and finesse of cotton field management have also been greatly affected. The change in fertilization, first of all, there is not so much organic fertilizer, and for this reason, he increased the amount of fertilizer. In the past two years, a large number of high-nitrogen compound fertilizers have been sold on the market. As a result, he had the following changes in fertilization in large-scale cotton fields. One did not apply organic fertilizer and the other applied chemical nitrogen fertilizer. The amount of nitrogen fertilizer has more than doubled in the past. However, last year his cotton seed production per mu was only about 230 kg. This year, a new situation has emerged in his cotton field. A light-colored annulus has appeared on the petiole of the newly formed leaves of the flowering boll period, which is a very regular annulus. The peasant did not understand why there was a zoning phenomenon on large-scale cotton plants. In the past, cotton plantlets on small-scale cotton fields did not have petiole hoops, and the cotton yield was higher.
Experts comment: Cotton plants appear light-colored bands on the leaves of flowers and bolls, which are typical symptoms of boron deficiency. Boron is a micronutrient that is essential for plant growth. Cotton is a boron-tolerant crop that is sensitive to boron. When cotton is deficient in boron, the tip of the shoot is withered, the old leaves become thicker and brittle, and the roots are short-brown, especially with abnormal development of flower organs. The petiole of the new leaves shows an annulus, and when it is severe, the cotton “bud without flower†is harvested. In this case, it can be discerned that small areas of cotton do not lack boron, while large areas of cotton show a lack of boron, mainly due to unbalanced fertilization. This must be analyzed from two aspects: First, large-scale cotton management applies only chemical fertilizers without organic fertilizers, while organic fertilizers are nutrient-rich fertilizers that can supplement trace elements. Second, there is an imbalance between nitrogenous fertilizers, high nitrogen and other elements such as potassium and boron. These two unbalanced fertilization results in cotton deficiency conditions, which also affect cotton yield and quality.
The solution, the first to make up boron, boron is a trace element fertilizer, fertilization method is different from a large number of elements, you can use foliar spray, you can also mix the amount of solid boron and organic fertilizer application. Second, the fundamental solution is still to balance the fertilization. It is necessary to balance the organic and inorganic, but also a large amount and a small amount of balance. In terms of large-scale element fertilization, the first is the balance of nitrogen and phosphorus and potassium. Excessive nitrogen will lead to nitrogen-potassium, Nitrogen-boron is not balanced.
Case Tip: The basic principle of fertilization in high-yielding cotton fields is to balance large amounts of elements with trace elements, and second, to balance organic-inorganic.
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