PGA is a water
soluble, biodegradable, non-toxic biopolymer produced by microbial
fermentation. PGA is a sticky material first found in "natto", a
fermented soybean. PGA is an unusual anionic, naturally occurring homo
polyamide that is made of D & L glutamic acid units connected by amide
linkages between alpha amino & gamma carboxylic acid groups.
It is produced
through fermentation by Bacillus subtilis using glutamic acid. PGA is consists
of glutamic acid monomers crosslinked between α-amino and γ-carboxyl groups,
and the molecular weight of PGA is usually between 100~1000 kDa. It is
water-soluble, edible and non-toxictowards human, and is environment friendly.
It has broad applications in the fields of medicine, food, cosmetics, and water
treatment.
Specification
CAS No.:
25513-46-6
Other Names:
Grade Standard:
Food
Grade, Cosmetic Grade, Agricultural Grade
Usage:
Animal Pharmaceuticals
Purity:
99%min
Appearance:
White Powder
Product Name:
Polyglutamic Acid
CAS:
25513-46-6
Shelf life:
2 Years
Poly Y Glutamic Acid,Poly Gama Glutamic Acid,High Purity Polyglutamic Acid,Glutamic Acid Production Qufu Hi-Tech Trading Co., Ltd. , https://www.chinahyaluronic-acid.com
Management during warming 1. Pest control begins when insecticides begin to heat up, killing overwintering spider mites, aphids and other pests, and paying attention to uniform spraying. At the beginning of germination, 3 to 5 Baume degrees lime sulfur are sprayed to destroy all germs.
Second, fertilization and watering shall be conducted within 10 days after the soil, fertilizer, and water management are warmed up. If the base fertilizer is not applied or the base fertilizer is insufficient, the organic fertilizer may be topdressed once after warming up, and then a small amount of compound fertilizer may be used. After fertilization, a large amount of water is poured and the ground is thoroughly drenched. When the soil is slightly dry, a loose soil is used.
Third, the purpose of covering the plastic film covered with plastic film is to increase the temperature.
Germination temperature and humidity management during the shed period. Temperature cannot be raised too quickly when temperature management begins. If the temperature rises too fast and the temperature is too high, it will cause the peach tree to sprout quickly and bloom quickly. The reversed phenomenon of the first bud and subsequent flower often occurs, so that the buds compete for the storage of nutrients preferentially, resulting in a reduced fruit setting rate and severely affecting the development of the young fruit. And swelling, resulting in early shedding of young fruit. The temperature rise is divided into three steps: In the first step, only one third of the grasshoppers are pulled in the daytime and two are pulled one by one. The shelf temperature is maintained at 13°C-15°C during the day and 6°C-8°C during the night. 2 to 3 days. The second step is to pull up 1/2 of the grasshoppers during the day and pull them one at a time. The temperature of the canopy is maintained between 16°C and 18°C ​​during the day and 7°C to 10°C during the night for 2 to 3 days. The third step is to pull up all the grasshoppers during the day. When the temperature is too high, open the top air outlet to cool the air, keep the shelf temperature at 20°C～23°C during the day and 7°C～10°C at night.
Second, the relative humidity in the humidity management greenhouse is maintained at 70% to 80%, which is conducive to its budding. If the humidity is too high, it can be adjusted by ventilation, air control, or watering the membrane; if the humidity is too low, water can be sprayed, sprayed or watered on the ground and trees to increase the humidity.
The management of temperature and humidity in the budding stage. Temperature management The cultivation of peach trees in greenhouses is very important for temperature control. Temperature is too low peach tree root activity is blocked, the tree sprouts late; temperature is too high, buds germinate early, after the first leaves, affect fruit setting. During the budding period, the maximum temperature is 25°C during the day, and the minimum temperature is 0°C at night. During this period, the temperature is controlled by tightening the shed film and closing the vents. During the day, the drafting is completed and the temperature rises. The grass is kept warm at night. The temperature inside the plastic greenhouse mainly depends on sunlight to increase the temperature, and the temperature is controlled by opening and closing the vents and covering the grasshoppers. From the bud to the flowering stage, the daytime temperature is kept at 10°C-18°C and kept at 5°C or more at night.
Second, humidity management Greenhouse humidity includes soil moisture and air humidity. Since most of the time in the shed is in a confined state, the humidity of the air is liable to be too high. The soil moisture can be regulated by irrigation, and the air humidity can be adjusted by ventilation. When the humidity in the greenhouse exceeds 80%, ventilation and dehumidification can be used to adjust the temperature without affecting the temperature. It can also be controlled by irrigation to reduce humidity. If the soil is dry, it can be covered with plastic film after irrigation, or it can be controlled by sub-rotating hole irrigation. It is better to use sub-film irrigation.
Temperature and humidity management during the flowering period 1. Temperature management The temperature control during this period is very important. If the temperature is too high, it will affect the fruit setting; if the temperature is too low, the flowering will be irregular, the flowering period will be prolonged, and the flower will be frozen when it is severe. Appropriate flowering temperature: during the flowering period, the daytime temperature is controlled between 19°C and 21°C. It must not exceed 25°C. It should be controlled at 5°C-7°C during the night. The flowering temperature should be about 20°C during the daytime and 5°C during the nighttime. The greenhouse should be planted with peaches. Trees must be artificially pollinated. The highest temperature in the greenhouse is from 10 a.m. to 3 p.m. during the day. At this time, if the temperature exceeds 25°C, the tuyere must be opened for ventilation and cooling. If the temperature is lowered slowly, a small amount of grass shading can be temporarily used to control the temperature. The position must be changed frequently to prevent the trees from being unevenly heated and heated. Indoor air temperature and ground temperature affect each other and play an equally important role in the growth and development of peach trees. Only when the ground temperature and the temperature of the peach tree grows is the same, can the root system grow normally, absorb water and nutrients, and supply the flowering and fruit of the tree.
Second, the regulation of humidity Humidity, the flowering period should be controlled at 50% to 60%, and the flowering period should be controlled below 60%. The method of controlling the humidity is to release the air and remove moisture. Cover the membrane after watering before flowering and try not to water it during flowering.
Light management in the bud and flowering period The peach tree is highly luminous. Planting peach trees in greenhouses During this period of winter, the sunlight is weakest in the whole year. In addition, compared with the natural environment, plant growth is lush, with poor ventilation and light transmission, and the light intensity is weak. The need for growth and development makes it difficult to achieve high-quality, high-yield, and high-efficiency goals. Therefore, we must take effective measures to enhance light technology, improve the quality of light in the shed, and promote the photosynthesis of the leaves.
First, choose a good transparency of the film production experience has proved that polyethylene film is better than PVC film, non-drip film is better than ordinary film with drops, the drop-free film light transmittance is currently better, and application of More shed films.
Second, a reasonable planting of a reasonable density and good population structure, showing the branches in the growing season see light.
Third, cleaning the shed film often clean grass leaves and dust on the shed film to increase the transparency.
(fruit industry)
Gamma-poly-glutamic acid (gamma-PGA) is a natural occurring, multi-functional,
and biodegradable biopolymer.
Peach peach tree winter and spring management techniques
Peach trees in greenhouses must go through a certain period of low temperature to meet their demand for cooling before they can warm up to release dormancy. Peach trees grown in greenhouses must be artificially forced to sleep so that peaches can undergo normal physiological changes after a series of low-temperature exercises to germinate, grow, bloom, and produce results.