First, the symptoms of iron deficiency in vegetables. The vegetables are iron-deficient, the plants are short and chlorotic, and the symptoms of chlorosis are firstly manifested in the young part of the apex. The chlorosis occurs between the leaves of the leaves. On the leaves, the veins are dark green, the veins are yellow, and the yellow-green is obvious. In severe cases, necrotic spots appear on the leaves and gradually die. Stem and root growth are blocked, the diameter of the root tip is increased, a large amount of root hair is produced, or some organic acid is accumulated in the root.
1. Corn is iron-deficient. The chlorosis between the young leaves is striped, the middle and lower leaves are yellow-green stripes, the old leaves are brown, and the stems and leaves are purple-red. In severe cases, the entire new leaf is chlorotic and white.
2. Soy is deficient in iron. The upper leaves are yellowed, and the veins remain green and slightly curled. When severe, the new leaves are chlorotic and white, and gradually expand to brown spots until necrosis.
3, the potato is iron-deficient. The young leaves are chlorotic and regularly extend to the whole leaves. When severe, they turn yellow or white and curl upwards. The lower leaves are brownish yellow and green, and the leaves are curled.
4. Tomato is iron-deficient. The young leaves are yellow, and there are gray-yellow spots on the base of the leaves, which spread outward along the veins, sometimes with coke necrosis, and the symptoms develop from the top to the stems and leaves.
Second, the symptoms of excessive iron application in vegetables. Excessive iron is likely to cause plant poisoning. Iron poisoning is often accompanied by iron and zinc. There are brown spots on the old leaves, the roots are grayish black, and the roots are prone to decay.
3. Iron fertilizer types and application methods suitable for vegetables
1. Ferrous sulfate. Commonly known as iron or green scorpion, it is commonly used iron fertilizer, containing 19% iron, light green crystal, soluble in water. After absorbing moisture in humid air and being oxidized by air to yellow or rust color, it should not be applied as iron fertilizer, so it should be sealed and stored for moisture protection.
Can be used as base fertilizer, foliar spray and injection. The base should be applied in combination with organic fertilizer. Mainly for foliar application, the concentration is 0.2%-0.5%, generally need to be sprayed several times, the solution should be used now, adding a small amount of grinding agent to the spray to increase the adhesion on the leaf surface Improve the spraying effect.
2. Ammonium ferrous sulfate. Containing 14% iron, light green crystals, soluble in water. The application method is the same as above.
3. Organic complex iron. Commonly used is iron diamine tetraacetate, iron containing 9% - 12%; diethylene triamine iron pentaacetate, containing 10% iron; both are soluble in water.
The effect of applying soil or spraying is significantly higher than that of inorganic iron fertilizer. Iron EDTA is suitable and stable on acidic soil, but it is not suitable for soil with high pH. When the pH is greater than 7.5, the most Easily use diethylenetriamine pentaacetate. Generally used for spraying.
Fourth, pay attention to matters. Iron deficiency in soil is common, especially in calcareous soils. Excessive application of lime or excessively high levels of vegetable plants in acidic soils can lead to induced iron deficiency. The water and gas conditions of the cultivated soil are seriously dysfunctional, and the temperature is uncomfortable, which also affects the absorption of iron by the vegetable roots. Iron fertilizer is mostly applied by foliar application, with less application. Generally, when the effective iron in the soil is less than 10 mg/kg, the iron is applied to different degrees, and when it is more than 10 mg/kg, the iron is basically ineffective. The crops that are more sensitive to iron are broad beans, soybeans, corn, potatoes, etc. If iron fertilizer is applied to corn on iron-deficient soil, the yield increase can reach 5.8%-12.9%.
Brightness
The brightness of the in-line LED is different, and the price is different.
Lamp cup: general brightness is 60-70 lm; bulb lamp: general brightness is 80-90 lm.
1W red light, the brightness is generally 30-40 lm; 1W green light, the brightness is generally 60-80 lm; 1W yellow light, the brightness is generally 30-50 lm; 1W blue light, the brightness is generally 20-30 lm.
Note: 1W brightness is 60-110lm; 3W brightness is up to 240lm; 5W-300W is an integrated chip, which is packaged in series/parallel. It mainly depends on how much current, voltage, how many strings and how many parallels.
LED lens: PMMA, PC, optical glass, silica gel (soft silica gel, hard silica gel) and other materials are generally used for the primary lens. The larger the angle, the higher the efficiency of light output. With a small-angle LED lens, the light must be shot farther.
wavelength
In-line LEDs with the same wavelength have the same color. If the color is required to be the same, the price is high. It is difficult for manufacturers without LED spectrophotometers to produce products with pure colors.
White light is divided into warm colors (color temperature 2700-4000K), pure white (color temperature 5500-6000K), cool white (color temperature above 7000K) Europeans prefer warm white
Red light: band 600-680, of which 620 and 630 are mainly used for stage lights, and 690 is close to infrared
Blue light: Band 430-480, of which 460,465 stage lights are used more.
Green light: band 500-580, of which 525,530 stage lights are used more.
Beam angle
LEDs with different purposes have different light-emitting angles. Special lighting angle, higher price.
Antistatic ability
The in-line LED with strong antistatic ability has a long life and is therefore expensive. Generally, LEDs with anti-static voltage greater than 700V can be used for LED lighting.
Leakage current
LED is a unidirectional conductive light-emitting body. If there is a reverse current, it is called leakage. The in-line LED with large leakage current has short life and low price.
Light Emitting Diode In-Line,Led F5 In-Line,Tricolor Light Emitting Diode F5,Patch Light Emitting Diode F5
Dongguan XINYUDA Technology Co., Ltd. , https://www.gdxige.com