First, timely planting. In the middle region of our province, the suitable planting period for spring lettuce is generally in late March. Mushi decomposed chicken manure 4 side, potassium sulfate compound fertilizer 50 kilograms, boron fertilizer 1 kilogram, zinc fertilizer 1 kilogram, mix evenly, spread on the surface, deep leveling, made flat. Colonization should be carried out in the morning on a sunny day. The planting depth can be set flush with the soil. After the planting, the planting water was planted in a timely manner. The density was 40 cm and the spacing was 30 cm.
Second, water and fertilizer management. The second day after planting, the mulching film was used to increase the ground temperature and quickly reduce seedlings. Since the temperature in early spring is low, it is not appropriate to water more. After 15 days of planting, the second water is poured, and then the seedling stage is reached. The seedlings are about 10 days old. When the tender stems of lettuce start to expand, they should be top-dressed with water, Mushi ammonium bicarbonate 50 kg or urea 15 kg. Enter the tender stem after the expansion period is more sensitive to moisture, should always keep the soil moist, watering about 7 days 1 time.
Third, disease prevention and pest control. Downy mildew is a common disease in lettuce production. It mainly infects the leaves. After the onset, the seedlings turn yellow and die. The adult plants start from the old leaves of the lower part and produce irregular pale green to yellow irregular spots on the leaves. Corresponds to the white mold, sometimes mold layer can spread to the front of the blade. Later lesions on the leaves turned brown, connected to pieces, yellow and dry. Sometimes bacteria can spread to the stem, causing the stem to darken. 68.75% silver facia spray can be used to control 2-3 times. Small ground tigers and other underground pests mainly harm the roots of lettuce, and can be used to administer phoxim in late March. Aphids and whitefly can be sprayed with 10% of imidacloprid 800-1000 times.
Fourth, timely harvest. The harvest period of lettuce is at the time when the heart leaves and the outer leaves are level, and is commonly called "flat mouth", that is, when the top of the lettuce is at the level of the tip of the tallest blade, it is the best harvesting period. The harvest is premature, the yield is low, and the yield and benefits are affected. When the harvest is too late, convulsions are likely to occur and the quality is reduced.
I. Introduction
Cationic fixing agent is polyelectrolyte, consists of a series of organic synthesis with low molecular weight and strong cationic, which is generally 100% cationic. Product character is aqueous solution.
II. Performance Indicators:
1. Appearance: colorless to pale yellow viscous liquid
2. Solid content: ≥ 50%
3. PH: 2 ~ 6
4. Viscosity: 50 ~ 200 mpa.s
III. Application Field
Used in paper pulp as a cationic fixing agent. Usually the slurry contains colloidal particles consisted of fiber materials, additives and water, which are with anionic charge and interfere the papermaking process, so it is also known as anionic trash; the interference is mainly in the following aspects:
1. Influence wet chemical additives` normal function, especially for cationic retention and drainage aids, sizing agent; or cause to increase the amount of wet chemical additives;
2. Deposits in the paper machine system; interfere the efficient papermaking process.
3. COD discharge of sewage systems, increasing the load on the sewage treatment plant. Recommended for use in mechanical pulp, chemi-mechanical pulp, and secondary fiber pulp slurry and coating waste stuff. Anionic trash neutralized by fixing agent can be bonded to the fibers so as to be taken away by paper sheets.
IV. Methods of Application
Adding methods: excellent water-solubility; can spread out in water instantly. Dosing pump is generally used to drive it into a static mixer or a mixing pump , mixed with water, diluted to about 0.2% of the dissolved solution, and then into the slurry system.
Adding point: the general adding point is in the front of flow system, that is, before the machine chest or fan pump; or add in the pulp plant. Which is taken into consideration for the reaction time of the cationic fixing agent polymer molecules and garbage, also need to time and space for other wet end additives. According to the slurry source, sometimes you need to select two or more points to add. When the slurry contains a source of coated broke, generally requires additional anionic trash fixative in the transport of the paper sheet.
Adding dosage: anionic trash content in the slurry is usually gauged by the cationic charge contents measured by PCD (particle charge analyzer) in the slurry. The measure will directly show the dosage tips, but the real dosage depends on the practical application. For general slurry, the recommend amount is in the range of 0.3kg ~1.8kg/t dry pulp.
V. Safe Operation
1. Cationic fixing agent is a water-soluble polymer, dissolved in water in a highly slippery state and avoid to spill on the floor. If spill, shall timely absorb with sand, sawdust.
2. Wear gloves, wear overalls to operate.
VI. Storage
The product should be kept sealed, stored in cool, dry, ventilated places, and appropriate temperature should be 10-30 ℃.
VII. Package
200 kg plastic drums or 1000 kg PE IBC drum.
Fixing Agent,Fixer,Anionic Trash Catcher,Charge Neutralizer
Shandong Tiancheng Chemical Co., Ltd. , https://www.tianchengchemical.com