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Humic acids are extremely important as a medium for transporting nutrients from the soil to the plant because they can hold onto ionized nutrients, preventing them from leaching away. Humic acids are also attracted to the depletion zone of the plant root. When they arrive at the roots, they bring along water and nutrients the plant needs.
The depletion zone is the area close to the root of a plant from which the root draws (depletes) nutrients. This zone can become particularly depleted if there is a lack of either humic acid or mycorrhizal fungus. When plants are mycorrhizal, the depletion zone is of less importance. Mycorrhizae have hyphae micro-tubes that can extend much further into the soil than the host plant can reach. They can gather mineral nutrition for the benefit of the host plant from outside the depletion zone. Humus is even more critical for plant nutrient availability and uptake if there aren’t healthy mycorrhizal relationships in the soil.
Positive ions are more easily absorbed by a plant’s root because the root has a negative charge. In other words, the positive (cation) is attracted to negative (the living root). Humic acids hold cations (positive ions) in a way they can be more easily absorbed by a plant’s root, improving micronutrient transfer to the plant’s circulation system. This works because humic acids (ulmic, humic, and fulvic) pick up positive ions and are then attracted to the root depletion zone and to the hyphae micro-tubes of mycorrhizae.
Since the root’s negative charge is greater than humic acid biomolecules’ negative charge, scientists theorize that the micronutrients are taken up by the plant’s root and are absorbed by the plant’s circulation system. Some of the micronutrients are released from the humic acid molecule as they enter the root membrane, but we are now realizing that the plant will also uptake some of the lighter molecular-weight humic acids as well. In essence, the humic substances are chelating such cations as magnesium (Mg2+), calcium (Ca2+), and iron (Fe2+). Through chelation, humic substances increase the availability of these cations to plants.
by ecofarm daily
Some of the most common substances we collectively refer to as “humus” include:
- Fulvic acid: a yellow to yellow-brown humic substance that is soluble in water under all pH conditions and is of low molecular weight.
- Humic acid: a dark-brown humic substance that is soluble in water only at higher soil pH values and is of greater molecular weight than fulvic acid. Humic acid may remain for centuries in undisturbed soil.
- Humin: a black humic substance that is not soluble in water at any pH, has a high molecular weight, and is never found in base-extracted liquid humic acid products.
By Ecofarming daily
γ-PGA has hydrophilic group -carboxyl which can maintain soil moisture content, improve soil flushing and gap, improve sandy soil, and promoting fertilizer and water preserving capacity of soil.
Some study results,
When γ-PGA made resin was used to deal with seeds, which can increase the germination rate of seeds in drought and water-deficient areas.
Use γ-PGA to directly mix or soak, which can promote the height of the wheat plant and increase the seedling rate.
Simulation of 5.0, 10.0, and 16.5mm rainfall, add 150, 300, and 500ml γ-PGA water immersion to the dry soil, which can increase seedlings and extend the depth of the root system.
From Evaluation of the controlling Pomacea canaliculata with calcium oxide，
ammonium bicarbonate， Camellia oleifera powder and tea saponin by Wang Zhigao1 Tan Jicai1* Liu Jun1， 2 Wang Weiguo
Water stress decreases seed-germination characteristics and also hinders subsequent seedling establishment. Seed priming with bioactive compounds has been proven as an effective way to improve seed germination under normal and stressful conditions.
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After three consecutive uses,
Spray 5% chitosan-oligosaccharide alone 600 times of the liquid treatment
The number of tube, number of tillers and plant height of chives were increased by 7.5%, 21.50% and 1.74% compared with the blank control. The yield per mu reached 4266.69kg, which was increased by 25.49% compared with the blank control. It can be recommended for production.
For more about chitosan-oligosaccharide
Integrated Pest Management (IPM) is an effective and environmentally sensitive approach to pest management that relies on a combination of common-sense practices. IPM programs use current, comprehensive information on the life cycles of pests and their interaction with the environment.