Developing autumn carrot planting techniques

Field management carrots can be planted about 10 days after sowing. After the seedlings are out, choose sunny and windless days. It is best to remove the cover wheat straw or mulch film in the morning. In the cold, windy days, the cover is easy to "flash seedlings". Since the film cover time is short and there is little damage, it can be stored and reused.


When the seedlings grow 2 true leaves, choose the first seedling at noon on a clear and windless day, the seedling distance is 2 cm to 3 cm, and the seedlings are 3 to 4 pieces of true leaves. The distance is about 10 cm. After the seedlings are planted, shallow cultivating is started once, combined with cultivating, and soil is loosened, weeded, and soiled. Carrots in the germination period, seedling period positive temperature, ground temperature is low, unless it is particularly dry, it is generally not suitable to water, until the carrot fleshy roots expand at the beginning, the temperature gradually rises when the water begins to water. Carrot fleshy roots need to have the most fertilizer and water in the middle and late growth stages, and should supply sufficient water and fertilizer in time to keep the soil moist. If the watering is insufficient, the fleshy roots are small and rough. Uneven water supply can easily cause cracking of fleshy roots. Generally, the top dressing is 2 times to 3 times, and each hectare (15 mu ) is topdressed with roots with 32.5 kg of potassium dihydrogen phosphate and 45 kg of water plus 1500 kg to 1875 kg. If it is found that the aboveground growth is too strong, it is sprayed with 5% paclobutrazol WP 1500 times to promote the expansion of fleshy roots. Carrots have fewer pests and diseases, but they are susceptible to aphids in the later stages of growth. They can be sprayed with 40% omethoate 1000 times to 1500 times or 2.5% deltamethrin ( enemy kill ) emulsifiable concentrate 2500 times.


Source: China Agricultural Promotion Network


Total 1 | <First <Prev 1 Next> Last> |
share to:

PPO plastics (MPPO)

(polyphenyl ether)

English name: poly(phenylene oxide)

Weight: 1.07 g/cm3 molding shrinkage rate: 0.3 0.8% molding temperature: 260-290 ℃ drying conditions: 130 ℃ for 4 hours

Material performance 1, for white particles.The comprehensive performance is good, PPO plastics can be used in 120 degree steam, electric insulation is good, absorb water is small, but have stress crack tendency.Modified polyphenyl ether can eliminate stress cracking. 

2. Excellent electrical insulation and water resistance, good dimensional stability.Its dielectric properties are the first in plastic. 

3. PPO plastics has mixed the modified materials for PPO plastics and HIPS, and the materials on the market are now made of this material. 

4. High heat resistance, 211 degrees of vitrification temperature, 268 degrees of melting point, and the decomposition tendency of heating to 330 degrees. The higher the PPO plastics's content, the better the heat resistance, and the heat deformation temperature can reach 190 degrees. 

5. Good flame retardancy, self-interest, and with HIPS mixed with moderate flammability.Light and non-toxic can be used in food and medicine industry.The resistance to rotation is poor, and the use of long time in the sun will change color. 

6. PPO plastics can be combined with ABS plastics ,HDPE plastics,PPS plastics ,PA plastics, HIPS plastics, Glass Fiber, etc.1. Suitable for heat resistant parts, insulation parts, wear resistant parts, transmission parts, medical and electronic parts. 

2. The parts can be used in high temperature, such as gears, blades and valves, which can be used for stainless steel.

3. Make screws, fasteners and fittings.

4. Electrical components of motor, rotor, casing and transformer.

1. Non-crystalline material, small moisture absorption.

2. The fluidity difference is similar to Newton's fluid, the viscosity is sensitive to the temperature, the product thickness is generally more than 0.8mm.It is very easy to break down and decompose into corrosive gases.The molding temperature should be strictly controlled, the mould should be heated and the flow resistance should be small.

3, Polyphenylene oxide, bibulous rate is about 0.06% less, but traces of water will lead to product surface not smooth phenomenon such as silver, it is best for dry processing, temperature is not higher than 150 degrees, otherwise the color will change.

4. The forming temperature of polyphenyl ether was 280-330 degrees, and the forming temperature of modified polyphenylene ether was 260-285 degrees.

Sheet specification: thickness from 2mm- 120mm, specification 600* 1200mm, other color and specification can be customized

Bar specification: diameter from 10mm- 200mm, length 1000mm, other color and specification can be customized.

PPO Plastic rod

PPO Plastic Sheet

PPO Plastic Sheet,PPO Plastic Products,PPO Material Plastic Sheet,Engineering PPO Sheet

Dongguan Noegem Plastic Products Co.,Ltd ,