- Potassium humate plays a significant role in alleviating agricultural drought hazards.
- Potassium humate: reduce the opening of the pores and reduce the transpiration of water. After two days of spraying, the pore width can be reduced by 72.7%.
On the 9th day, the total transpiration was reduced by 13.7% compared with the control, and the soil moisture content was increased by 1.5%. The effect of narrowing the stomatal opening after application of the drug lasted for more than 12 days, and basically disappeared on the 13th day. After that, the mechanism of anti-transpiration of potassium humate. They sprayed different concentrations of potassium humate at the booting stage of wheat, and found that with the increase of dosage and concentration, the stomatal closure degree increased correspondingly, and the duration of drug effect was also extended, up to 22 days. The effects of potassium humate on transpiration of wheat, corn, peanut, tobacco, sweet potato, soybean and other crops were found to be different between different crops. The stomatal opening degree of wheat, corn and oats decreased by 51.2%–60.4% compared with the control, and soybean and alfalfa decreased by 48.3%–67.1%. There are also differences between different varieties of the same crop. Generally, the inhibition of stomatal opening is stronger with the increase of the concentration of the drug, but the opening of the pore is too small to hinder the absorption of carbon dioxide, which affects the photosynthesis of plants, so it is necessary to determine the appropriate concentration.
- Promote root development and increase root activity. Seed dressing with potassium humate was carried out with wheat, and the number and length of secondary roots increased significantly. This effect can be continued from the seedling stage to the wintering and returning stages. The seed dressing plants grew robustly, the root-shoot ratio increased, the lower leaves senescence delayed, the number of green leaves remained, the photosynthetic area increased, and dry matter accumulation increased. Potassium humate also has obvious effects on the growth and vigor of roots such as corn, rice, peanut and sweet potato. Maize was planted with 0.5% potassium humate, the average root length increased by 3.6 cm, the number of roots increased by 1.3, and the dry matter weight increased by 1.45 g, thereby increasing the absorption of nitrogen, phosphorus and potassium in the soil. Whether it is seed dressing, soaking or spraying.
- Impact on soil water holding capacity. Spraying humic acid potassium inhibits crop transpiration, slows down soil water consumption, and increases soil water content. In addition, potassium humate has the effect of improving soil structure, which is beneficial to maintain soil water balance and play a role in water conservation. Make the crops through the dry period. The change of soil water content in different periods after spraying humic acid potassium in wheat decreased by 4.3%–5.1% within 10-20 days after spraying. After the application of potassium humate to corn, the water content in the deep layers of different soils increased by 7.0%–35.7%.
Second, improve the cold resistance of crops
The use of potassium humate on rice, winter wheat, rapeseed, apple, pear, peach, grape, and greenhouse vegetables can increase the cold resistance of crops and prevent and mitigate low temperature and cold damage. The main mechanism is that potassium humate can stimulate the activity of some enzymes in plants, affecting some osmotic adjustment substances, thus protecting the cell membrane.
Third, improve the disease resistance of crops
Potassium humate has certain preventive effects on various plant diseases.
- For the control of wheat gibberellin, in the case of the same amount of carbendazim, the treatment of potassium fulvic acid treatment reduced the disease rate by 30% compared with carbendazim alone, and improved the control effect.
- Prevention and treatment of sweet potato diseases. The rooting of “potassium fulvic acid sodium” was better than that of sodium humate sulphate alone; black spot disease had better control effect.
- Prevention and treatment of peanut leaf spot. The test results of using potassium humate and carbendazim to control peanut leaf spot disease fully demonstrate that potassium humate has synergistic effect on carbendazim, saves pesticides and reduces cost, and is an ideal pesticide synergist. .
- Prevention and treatment of cotton blight and verticillium wilt. The control effect and synergistic effect of potassium humate on cotton blight and verticillium wilt. The three application methods of seed dressing, root filling and spraying have obvious control effects on cotton blight and verticillium wilt, and the control of the disease is also improved with the increase of the dosage or the application frequency. Spray 1500 times solution, once every 10-15 days, need to spray 3 times; root irrigation with 2000 times liquid fulvic acid potassium, 10-15 days once, twice is appropriate; seed dressing 150 grams / acre is the most it is good. The control effect of root irrigation and seed dressing is better than spraying, but root irrigation is not easy to apply, and seed dressing is the most labor-saving and time-saving method.