Symptoms Broccoli growth and development in addition to the three elements of nitrogen, phosphorus, and potassium, the need for boron, magnesium, calcium and other trace elements. In the absence of boron, the stem becomes hollow or the interior of the flower ball is cracked, and brown spots appear on the flower. This causes bitterness, death of the top bud, hard texture, and loss of food value. The calcium deficiency exhibited small buds, dark color, and yellowing during flower bud development. The three nitrogen-deficient plants are dwarf, the leaves are light green and gradually yellow, and some of the broccoli stems and leaves turn orange to purple, with slow growth or premature aging. Four phosphorus leaves appear slightly red. Five deficient potassium leaves shrank, leaves rewinded, and cauliflower matured unevenly. Six deficient magnesium leaves were partially chlorotic with pale green spots.
Etiology Deficiency of boron in the soil, lack of calcium or high temperature and humidity affect the absorption of calcium, leading to calcium deficiency; lack of nitrogen before the application of a small amount of organic fertilizer or low nitrogen content in soil, rainfall, multi-nitrogen leaching; phosphorus deficiency soil pH value Low phosphorus content, soil compaction and low temperature affect the absorption of phosphorus; Potassium-deficient sand and other low potassium content, production of potassium fertilizer supply is insufficient, or excessive use of lime fertilizer, inhibit its absorption of potassium.
Prevention methods (1) When boron is deficient, apply borax 0.7-lkg per 667 square meters, timely watering, and increase the content of soluble boron in the soil to facilitate absorption and utilization by broccoli. In case of emergency, 0.1% to 0.25% borax aqueous solution can be sprayed. (2) When calcium deficiency occurs, slaked lime is applied to 80 to 100 kg per 667 square meters, and it is necessary to deepen it to distribute it in the root layer to facilitate its absorption. In case of emergency, 0.3% calcium chloride aqueous solution may be sprayed once every 5 days. (3) When there is a shortage of nitrogen, topdressing available nitrogen fertilizers, such as urea, ammonium bicarbonate, etc., or using 0.3% urea solution for foliar spray fertilizer, can quickly turn stems green. (4) Water shortage should be combined with water. Topdressing quick-acting phosphate superphosphate or diammonium phosphate. Can also be used 2% superphosphate calcium leachate foliar spray fertilizer. (5) When potassium deficiency is combined with watering, apply 5 to 10 kg of potassium sulfate or potassium chloride per 667 square meters or l00 kg of vegetation ash, and spray 200-250 g of potassium dihydrogen phosphate in emergency, 50 kg of water, and 0.4% ~0.5% aqueous solution. Promote the application of silicate bacterial biopotassium fertilizer or "Yiyi" microbial active organic fertilizer 300 times or Yunda 120 plant growth regulator 3000 times, 1.8% love more than 7000 times liquid agent. Can also be used Green Fertilizer 50 ~ 80kg/667 square meters hole.
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