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The cotton field timely boron
Recent surveys have found that there are different degrees of boron deficiency symptoms in cotton fields, and it is necessary to apply boron fertilizer according to local conditions. The deficiency of boron in cotton strains usually shows the following symptoms: ring infiltration zone appears on the petioles, the upper leaves are zonally obvious; the bud leaves are easy to open, like insect pests, easy to fall off; fruit branches are shortened, sometimes fruit branches and leaf branches on the main stem Staggered; small and small flowers, flower opening degree is poor, prone to buds without flowers, flowers without bells; Cheng Ling few bells light, sharp hook-like. In the cotton field with severe boron deficiency, the zonal band on the petiole of the old leaves is dark in color, the veins are prominent, the leaves become brittle, the new leaves become smaller, the leaves are shrinking, and the leaves curl. For boron-deficient cotton fields, boron fertilizer should be applied and sprayed with boron-containing foliar fertilizer in the growing season. In general, the holding force of boron is about 250 grams per mu, and the amount of the field with severe boron deficiency is appropriately increased. In the basal fertilization field, no boron fertilizer is applied, and the bud fertilizer or flower bell fertilizer should be used in combination with 200 to 250 grams of boron per acre. Bud stage, flowering stage, and boll stage can spray 0.1% to 0.2% sudra boron solution once.