First, nitrogen deficiency. Symptoms usually appear when there is a lack of nitrogen, especially during the peak growth period. The leaves gradually lose their green color and turn light green. As the deficiency worsens, they become yellow, with smaller leaf size compared to normal. Young leaves may appear greener, while the petioles and calyces of older leaves turn reddish. Leaves may also be pale, jagged, or have bright red edges. This condition often occurs in poor soils, where fertilization is inadequate, or in fields with excessive weeds.
To manage nitrogen deficiency, apply base fertilizer that suits the short and concentrated growth phase of spring. If symptoms are observed, apply 11.5 kg of ammonium nitrate or 8.5 kg of urea per acre, and water immediately after application. Alternatively, you can spray a 0.3% to 0.5% urea solution or a 0.2% potassium dihydrogen phosphate solution 1-2 times, using about 50 kg of solution per acre.
Second, phosphorus deficiency. Plants show weak growth and slow development, with dark green leaves that may take on a bronze tint. As the deficiency progresses, purple spots appear on the upper leaves, and older leaves also display similar symptoms. Flowers and fruits tend to be smaller than usual. Soils high in calcium, acidic soils, sandy soils, or those with low organic matter are more prone to this issue.
Once symptoms appear, spray a 1% superphosphate solution or a 0.1%-0.2% potassium dihydrogen phosphate solution 2-3 times, every 7-10 days, applying about 50 kg of solution per acre.
Third, potassium deficiency. Early signs appear in newly matured upper leaves, with brown, dry, or burned edges. The damage spreads between the veins, and older leaves suffer more severe damage. Leaf burns may increase under sunlight, making it easy to confuse with sunburn. The petiole turns brown, and as the deficiency continues, the leaf wilts. Potassium-deficient strawberries have a lighter color and poor flavor.
To control potassium deficiency, apply 7.5 kg of potassium sulfate per acre. Alternatively, spray a 0.1%-0.2% potassium dihydrogen phosphate solution 2-3 times, once every 7-10 days, using 50 kg of solution per acre.
Fourth, magnesium deficiency. Initially, the edges of upper leaves turn yellow and brown, with chlorotic areas between the veins. In severe cases, necrotic spots appear. As the deficiency increases, older leaves turn pale and swell, with more pronounced scorching. Magnesium deficiency often occurs in sandy soils or when too much nitrogen or potassium fertilizer is used.
Apply foliar sprays of a 1%-2% magnesium sulfate solution 2-3 times, every 10 days, with 50 kg of solution per acre.
Fifth, boron deficiency. Early symptoms include shriveled young leaves, yellowing edges, and damaged growth points. As the deficiency progresses, the veins of older leaves may turn green or curl upward. Boron-deficient plants produce small flowers, reduced pollination, deformed fruit, and poor quality. Dry conditions and boron-deficient soils can worsen the problem.
To manage boron deficiency, ensure timely watering to increase soil soluble boron content. Spray a 0.15% borax solution 2-3 times, reducing concentration during flowering. Apply 50 kg of solution per acre each time.
Sixth, iron deficiency. Young leaves show yellowing or chlorosis, with veins remaining green in mild cases. Severe deficiency leads to white, necrotic, or yellow leaves. Alkaline or acidic soils are more likely to cause this condition.
To address iron deficiency, adjust soil pH to 6-6.5 and spray a 0.2%-0.5% ferrous sulfate solution 2-3 times.
Seventh, zinc deficiency. As the deficiency worsens, old leaves narrow, with the base becoming thinner and the upper part elongated. Zinc deficiency does not cause necrosis, but severe cases result in yellow new leaves, reddish veins, and serrated edges. Plants become fewer and weaker.
To prevent zinc deficiency, add organic fertilizer and improve soil. Spray a 0.05%-0.1% zinc sulfate solution 2-3 times, ensuring the concentration is not too high to avoid phytotoxicity.
Eighth, molybdenum deficiency. In early stages, leaves turn uniformly light green, regardless of age. As the deficiency increases, leaf edges curl and scorch.
To treat molybdenum deficiency, spray a 0.03%-0.05% ammonium molybdate solution 2 times, using 50 kg of solution per acre.
This classification mainly includes the aluminum low-pressure casting Machinery Parts using in Chassis area.
Normal raw material: A356.ZL101A.ZL101.AlSi7Mg
The pressure on the surface of the molten metal is 0.06~0.12Mpa.This processing has good shrinkage, casting tissue is dense, easy to produce the large thin-walled complex parts, the casting head is not needed , metal yield can be up to 95%.
Process Technology: Low-pressure casting,T6 Treatment,Shot Blasting,NC Machining,Spray Coating
Product Dimensions: Customized
Casting General Tolerance: Grade GBT6414-CT8
Flow Processes: Die casting, Degating to remove the residual of the gate, Polishing and Deburring to remove the burrs, Polishing to remove the parting line, flash,CNC Turning, Cleaning, Packaging, Storaging, Shipping
Control Measure: Incoming Material Test, First Article inspection, Routing inspection, Final item inspection, and Outgoing quality control
Inspection Equipment: CMM, Caliper, Plug Gage, Screw Gauge
Application: Machinery Parts
Certificate: IATF16949:2016,ISO14001:2015,ISO45001:2018
Lead Time: 30-35 days
Trade Term: FOB Ningbo
Aluminum Low-Pressure Chassis Parts,Al Low-Pressure Casting Chassis Parts,Low-Pressure Casting Chassis Parts
NINGBO ZHENHAI BOLANG METAL PRODUCTS FACTORY , https://www.casting-part.com