Urea is the most widely used nitrogen fertilizer for our farmers. It is easy to store and use. It is used as a neutral fertilizer for various soils and plants. Urea has a high nitrogen content, and its effect after application has no side effects and is deeply loved by farmers. However, due to the incorrect application method of urea on various crops, the application period is not suitable, and the formation of crops such as greed, lodging, and occurrence of fertilizers frequently occur. So, should urea be used in the end? Cherry girl will give you a piece!
A: Urea use precautions
First, urea can not be mixed with ammonium bicarbonate : the combination of urea and ammonium bicarbonate will slow down the conversion to ammonia and easily cause the loss and volatilization of urea.
The second is to change the habit of spreading on the surface: urea can be used for 4 to 5 days to be used, resulting in serious volatilization, low utilization and serious waste.
The third is that urea is used as a seed fertilizer : a small amount of biuret will be produced during the production of urea, and when the concentration exceeds 2%, it will poison the seeds and seedlings.
Do not immediately irrigate after the fourth urea application : Urea is an amide nitrogen, which must be converted by the crop after 2 to 10 days of conversion. If it is applied immediately, the urea will be dissolved in the water.
Fifth, do not mix with alkaline fertilizer: the application of urea to ammonia nitrogen is absorbed by the crop during the absorption process of the lime, grass ash, calcium magnesium phosphate fertilizer and other alkaline fertilizers will cause most of the nitrogen to become ammonia volatilization.
The sixth application amount should not be too large: although the nitrogen content of urea is high, it needs to be converted and absorbed. If the dosage is too large, it will not only waste serious but also cause "fertilization". Infiltration into the ground can also cause pollution of the groundwater body and the formation of nitrite deposits, thus affecting the safety of humans and animals.
The concentration of the seventh foliar spray should be suitable : Urea is an ideal foliar fertilizer, easy to transform and easy to absorb, but if the concentration is too large, it will burn out the leaves and poison the plants.
The eighth is not to be applied in the near-harvest period of the crop: the application of urea is too late, which is not conducive to the effect of fertilizer effect, which is easy to cause crops to be late and ripe.
The ninth urea cannot be applied alone : various crops require multiple nutrients, and urea nutrients should be applied in combination with organic fertilizers and phosphorus and potassium fertilizers to meet the needs of crops for various nutrients.
Many farmers' friends' idioms on urea are not equal to scientific use. Unreasonable use of urea is common. It is common: for example, after the spring is turned back to spring, the farmers will pour back the green water to apply urea or rush into the wheat field; the corn seedling farmers The urea is sprinkled into the field before the rain; the cabbage seedlings are washed with urea, and the urea is applied to the tomato during the seedling stage.
Two: Scientific use of urea
In this way, although urea is used, the waste is serious (ammonia volatilization, urea granules are lost with water), and it will lead to excessive nutrient growth, wheat, corn late lodging, tomato "blowing", cabbage delay, etc. Bad phenomena occur. In the end, how to apply scientifically, Cherry Xiaomei said to our farmers friends.
1. Balanced fertilization : scientifically apply nitrogen, phosphorus and potassium fertilizers in a balanced manner. Firstly, the phosphorus and potassium fertilizers needed for the whole growth period of the crops and some (about 30%) of the nitrogen fertilizers should be combined with the ground preparation; then the remaining 70% of the nitrogen fertilizer (which can be used as urea) is applied as a top dressing, and the critical period of the crops is required. The application is about 60%, and the late application is about 10%. Only the three kinds of fertilizers such as nitrogen, phosphorus and potassium can be rationally combined and scientifically applied to increase the utilization rate of urea.
2. Appropriate application : Each crop has a specific critical period for the absorption of nitrogen, phosphorus and potassium (ie, the period during which the crop is particularly sensitive to the absorption of certain elements). Different crops require different critical periods, such as wheat. The critical period of nitrogen requirement for grass crops such as corn is in tillering stage, ear differentiation stage, cotton in bud and boll stage, tomato in fruiting stage, cabbage in rosette stage, sunflower in flower bud stage, soybean in early flowering stage, etc. Apply one week before the critical phase of nitrogen demand.
3, deep application of soil : the application method is not correct, it is easy to cause urea loss. The correct application method is to dig a hole of 15-20 cm deep from the crop 20 cm away from the crop and apply the fertilizer to the soil.
4, foliar spray : the use of high-quality urea containing less biuret for foliar application, but the concentration should not be too high to prevent damage to the leaves. The spraying time should be after 4 pm, when the transpiration amount is small, and the leaf surface pores are gradually opened to facilitate the full absorption of the urea aqueous solution by the crop.
The above is the precautions for the use of urea and the scientific use of urea. I hope to be helpful to our farmers and friends. I would like to know more about the agricultural technology. Welcome to the Hui Nong School!
Barrier Mesh,Plastic Fence Mesh,Insect Barrier Netting,Agfabric Insect Netting
Changzhou Satidi Import and Export Co., Ltd. , https://www.guanjiejts.com