Crop science fertilization is one of the important factors related to the high and low yield. Different crop varieties and growth period should choose the fertilizer to be adapted. Here are some of the restrictions on fertilization, you have to pay attention to it~
1. Ammonium carbonate should be mixed with urea
The amide nitrogen in urea can not be absorbed by crops. Only under the action of gland enzymes in the soil, it can be converted into ammonium nitrogen before it can be applied to the soil by ammonium bicarbonate. The loss of volatilization of medium nitrogen cannot be mixed. The ammonium bicarbonate can not be mixed with the bacterial fertilizer, because the former will emit a certain concentration of ammonia gas, which has a toxic effect on the latter active bacteria, and the bacterial fertilizer loses the fertilizer effect.
2. After the urea is applied, avoid watering immediately.
Urea is applied to the soil and converted into amide, which is easy to be lost with water. It cannot be watered immediately after application, nor can it be applied before heavy rain. After application, soil cover can improve fertilizer efficiency.
3. Nitrate nitrogen fertilizer should not be applied in rice fields
Ammonium nitrate, sodium nitrate, etc. will dissociate nitrate ions, which are easily leached to the deep layers of the soil, causing denitrification and loss of nitrogen. The application of nitrate nitrogen fertilizer in dry land should not be used before or after watering.
4. Ammonium sulfate avoids long-term application
Ammonium sulphate is a physiological acid fertilizer. When applied to the same soil for a long time, it will increase its acidity and destroy the granule structure. In the alkaline soil, the ammonium ion of ammonium sulphate is absorbed, while the acid ion remains in the soil and reacts with calcium to make the soil compact. Harden.
5. Ammonium carbonate
It should be applied deep below 6 cm and covered immediately after application. It is also not suitable to be applied in the greenhouse. Because the ammonium carbonate is commonly called the gas fertilizer in the greenhouse, it is easily decomposed into ammonia gas and volatilized, causing waste; and when the ammonia concentration is too large, the crop leaves are burned.
6. Nitrogen-containing compound fertilizer should not be applied to legumes
Soybean, mung bean, peanut and other legume crops have nitrogen-fixing rhizobium. Excessive application of nitrogen-containing compound fertilizer not only causes waste, but also inhibits the activity of rhizobium, reduces its nitrogen fixation capacity, and makes the crops more mature and affects yield. .
7. Acidified fertilizer should be mixed with alkaline fertilizer
Ammonium bicarbonate, ammonium sulfate, ammonium nitrate and ammonium phosphate cannot be mixed with alkaline fertilizers such as grass ash, lime, kiln ash and potassium fertilizer, and neutralization reaction will occur, resulting in loss of nitrogen and reducing fertilizer efficiency.
8. Avoid applying phosphate fertilizer
Phosphate fertilizer is not suitable for dispersal use. It should be concentrated and can not be applied to prevent fixation. It is best to apply it to the root system. At the same time, fertilizers with higher phosphorus content are not suitable for use in vegetables.
9. Potassium fertilizer should be applied in the late stage of crops
Potassium can be transferred from the lower stems and leaves of the crop to the top part of the crop. The symptoms of potassium deficiency are later than those of nitrogen deficiency and phosphorus deficiency. Potassium fertilizer is best applied as a base fertilizer at one time, or applied at the seedling stage.
10. Containing chlorinated fertilizer should not be applied to saline soil and chlorine crops
Chloride ions in chlorinated fertilizers will accumulate in the soil, leading to acidification of the soil. Application in saline-alkali soils will aggravate salt damage. Application on chlorine-repellent crops will affect yield and quality. Forbidden chlorine crops include tobacco, fruits, beets and potatoes. Class, watermelon, etc.
11. Unfertilized farmyard manure and cake fertilizer should not be used directly
Unfertilized farmyard manure and cake fertilizer should not be used directly. The farmer's fertilizer and cake fertilizer should be fully piled up and cooked. After high temperature disinfection or chemical treatment, it can be used.
12. Rare earth micro-fertilizer should be directly applied to the soil
Rare earth micro-fertilizer should not be applied directly to the soil, but should be used as a seed fertilizer or foliar fertilizer.
12 taboos, do you know these? At present, the compact corn varieties used in production mostly have the phenomenon of “false ripeningâ€, that is, the corn stalk leaves turn white early and the grain has not stopped stagnating. These varieties are often harvested early. In production, the grain milk line in the lower part of the corn ear is dissipated, the grain water content is about 30%, the grain weight is the highest when the ear leaves turn white and loose, and the corn yield is also the highest, which can be used as the main indicator of the suitable harvest. At the same time, the formation of the black layer at the base of corn kernels is also an important reference indicator for timely harvest.
Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
Triangle Half Lead Apron,450*450 Triangle Lead Gonad Shield,0.35Mmpb Half Lead Apron,Triangle Anti-Radiation Medical Shield Cover
Longkou Kangxie Medical Instrument Co., Ltd , https://www.lkmradiology.com