One, Nitrogen Deficiency Disease. Symptoms typically appear when there is a lack of nitrogen, especially during the peak growth period. The leaves gradually shift from green to light green, and as the deficiency worsens, they turn yellow. The affected leaves are smaller than usual, and young leaves may remain greener. In older leaves, the petioles and calyces may turn reddish, with pale or jagged edges that appear bright red. This condition often occurs in poor soil, where fertilization is inadequate, or in fields with excessive weeds and poor management.
To manage nitrogen deficiency, it's important to apply sufficient base fertilizer that meets the short but intense growth needs of spring. If symptoms are observed, you can apply 11.5 kg of ammonium nitrate or 8.5 kg of urea per acre. Water should be applied immediately after. Alternatively, foliar sprays of a 0.3% to 0.5% urea solution (50 kg per acre) or a 0.2% potassium dihydrogen phosphate solution (2-3 times) can be used during flowering.
Second, Phosphorus Deficiency. Plants show weak growth, slow development, and dark green leaves with a bronze tint. As the deficiency progresses, purple spots may appear on upper leaves, and older leaves also display similar symptoms. Flowers and fruits become smaller compared to normal plants. Soils high in calcium, acidic soils, or sandy soils with low organic matter are more prone to phosphorus deficiency.
When symptoms appear, spray the plants with a 1% superphosphate solution or a 0.1%-0.2% potassium dihydrogen phosphate solution, 2-3 times, every 7-10 days. Apply about 50 kg of solution per acre.
Third, Potassium Deficiency. Early symptoms in strawberries usually appear on newly matured upper leaves, with brown or black scorched edges. The leaf tissue between veins may burn and develop necrotic areas. Older leaves suffer severe damage, and leaf burns may increase under sunlight, making it hard to distinguish from sunburn. The petioles of burned leaves often turn brown or dark brown, and the leaves may eventually wither. Potassium-deficient strawberries have a lighter color and poorer flavor.
To control this, apply adequate organic fertilizer, and use about 7.5 kg of potassium sulfate per acre. Alternatively, spray the leaves with a 0.1%-0.2% potassium dihydrogen phosphate solution 2-3 times, every 7-10 days, applying 50 kg of solution per acre.
Fourth, Magnesium Deficiency. Initially, the edges of upper leaves may yellow and become brown or scorched, with chlorosis between the veins and dark spots. As the deficiency increases, the stem leaves turn pale green and swell, with more severe scorching as the leaves age. Magnesium deficiency often occurs in sandy soils or when excess nitrogen and potassium fertilizers are used.
To treat magnesium deficiency, spray a 1%-2% magnesium sulfate solution 2-3 times, every 10 days, using 50 kg of solution per acre.
Fifth, Boron Deficiency. Early symptoms include shriveled, scorched young leaves with yellowed edges and damaged growth points. As boron deficiency worsens, the veins of old leaves may turn green or curl upward. Affected plants have small flowers, low pollination rates, deformed fruits, and poor fruit quality. Dry conditions and boron-deficient soils increase the risk of this issue.
To address this, ensure timely watering to increase soil soluble boron levels. Spray a 0.15% borax solution 2-3 times during the flowering period, adjusting the concentration if needed. Each application should cover 50 kg of solution per acre.
Sixth, Iron Deficiency. Young leaves may turn yellow or chlorotic, with the veins remaining green while the rest turns white. Severe cases result in completely white new leaves, which may become necrotic. Alkaline or acidic soils are more likely to cause iron deficiency.
To manage this, adjust the soil pH to between 6 and 6.5. Apply foliar sprays of a 0.2%-0.5% ferrous sulfate solution 2-3 times.
Seventh, Zinc Deficiency. As zinc deficiency worsens, older leaves narrow, especially at the base, with elongated narrow sections. However, no necrosis occurs. In severe cases, new leaves turn yellow, with reddish veins and serrated edges. Zinc-deficient plants grow fewer.
To prevent and control this, add organic fertilizer and improve soil conditions. 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 the early stages, leaves gradually lose color, turning from green to light green, regardless of whether they are young or mature. As the deficiency increases, the leaf edges curl and scorch.
To treat molybdenum deficiency, spray a 0.03%-0.05% ammonium molybdate solution 2 times, applying 50 kg of solution per acre each time.
This classification mainly includes the die casting Machinery Parts using in Valve area.
In the die casting process,higher specific pressure is required, so that higher filling speed can be gotten.which is helpful for alloy to overcome mold filling resistance.and effectively fill each part of the cavity.The Casting General Tolerance is Grade GB-CT4.
Process Technology: High pressure die casting,Shot Blasting,NC Machining,Spray Coating
Product Dimensions: Customized
Casting General Tolerance: Grade GB-CT4
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,Direct Reading Spectrometer
Application: Machinery Parts
Certificate: IATF16949:2016,ISO14001:2015,ISO45001:2018
Lead Time: 30-35 days
Trade Term: FOB Ningbo
Aluminum Die Casting Valve Part,Zinc Die Casting Valve Part,Al Die Casting Valve Part,Malaysia Die Casting Valve Part
NINGBO ZHENHAI BOLANG METAL PRODUCTS FACTORY , https://www.casting-part.com