What flowers can be on urea when

In addition to applying with soil and water, urea can also be applied at a ratio of 1 1000 leaves, but it is best to combine it with phosphorus and potassium fertilizer.

Grass flowers are relatively weak in seedling stage, suitable for pure chemical fertilizers--- nitrogen fertilizers such as urea, while woody flowers are stronger, although organic fertilizers are used well, and the soil is improved.

Generally speaking, after the flowers are potted, they can be fertilized after the potting period, but inorganic fertilizers should be applied diligently.

Urea can fertilize flowers.

We must know that the main function of urea is to promote the growth of new shoots of plants, which can improve the nitrogen content of plant leaves.

The use of urea can ensure that it grows quickly without missing other elements, so that our plants can grow vigorously, the new shoots are much longer, and the branches and leaves can be easily achieved.

The daily use of urea is described as follows:

1. Balanced fertilization.

Urea is a pure nitrogen fertilizer that does not contain a large number of elements necessary for crop growth.

Therefore, when doing top dressing, it should be based on soil testing and laboratory tests, and the formula fertilization technology should be used to apply nitrogen, phosphorus and potassium fertilizers in a balanced manner. First, all phosphorus, potassium fertilizer and part (about 30%) nitrogen fertilizer required for the whole growth period of the crop are combined with the bottom application of the ground.

Then apply the remaining 70% of nitrogen fertilizer (urea can be used) as top dressing, of which about 60% is applied in the critical period of fertilizer and maximum efficiency period of crops, and about 10% is applied in the later stage. Only the reasonable combination and scientific application of nitrogen, phosphorus and potassium fertilizers can improve the utilization rate of topdressing urea.

2. Appropriate follow-up.

Each crop has a specific critical period for the uptake of nitrogen, phosphorus, and potassium (i.e., the period when the crop is particularly sensitive to the uptake of a certain element). During this period, the lack of fertilizer (nitrogen, phosphorus, potassium) will reduce the yield and quality of crops, and the impact will be huge, even if sufficient fertilizer is applied later, the impact on crop yield and quality cannot be reversed.

In addition, there is also a period of maximum efficiency, that is, fertilizing crops during this period can obtain higher yields, and crops use fertilizers most efficiently. From the above analysis, it can be seen that only in the critical period of nutrition and the maximum efficiency period of crops, the utilization rate of fertilizer can be improved, so that crops can achieve high yield and high quality.

When urea is used as top dressing, it should be topdressed 1 week before the critical period of nitrogen demand and maximum efficiency period of the crop. Different crops need different fertilizer critical periods and maximum efficiency periods, so they should be treated differently and used reasonably. For example, wheat, corn and other grasses.

The critical period of nitrogen demand of crops is at tillering.

stage, panicle differentiation stage, cotton in bud stage, etc. Nitrogen maximum efficiency was in wheat at the jointing to booting stage, rice at the tillering to jointing stage, corn at the trumpet stage, tomato at the fruiting stage, cabbage at the rosette stage, and sunflower at the flower bud.

period, soybeans in the early flowering stage, etc.

3. Timely topdressing.

Urea is an amide fertilizer that needs to be converted to ammonium carbonate.

It is adsorbed by soil colloids, and then absorbed by crops, this process takes 6 7 days, during which urea is first dissolved by the water in the soil, and then slowly converted into ammonium carbonate, therefore, when urea is applied as top dressing, it should be applied about 1 week before the critical period of nitrogen demand and the maximum efficiency period of fertilizer, not too early or too late.

1. Urea is suitable for all crops and all soils, and can be used as base fertilizer and top dressing, and can be applied in dry paddy fields. Urea is suitable for base fertilizer and top dressing, and sometimes also used as seed fertilizer. Urea is molecular before conversion, which cannot be adsorbed by the soil, and should be prevented from being lost with water; The ammonia formed after conversion is also volatile, so urea should also be deeply covered with soil.

2. The flower organs of sparse flowers and sparse fruits are sensitive to urea, but slow to respond to gamian. Therefore, urea flower and fruit thinning tests were carried out on peaches and nectarines abroad. The results showed that peaches and nectarines required higher concentrations () to achieve better results.

The optimal concentration is 8%-12%. Within 1-2 weeks after spraying, the purpose of thinning flowers and fruits can be achieved. However, the responses of different varieties at different times and under different soil conditions still need to be further tested.

Extended Materials. Uses of urea.

1. It is widely used as a raw material for the production of melamine, urea-formaldehyde resin, hydrazine hydrate, tetracycline, phenobarbital, caffeine, reduced styrene-butadiene rubber, phthalocyanine blue B, phthalocyanine blue BX, monosodium glutamate and other products.

2. In order to overcome the size of the apple field, spray urea aqueous solution twice on the surface of the leaves twice in 5 to 6 weeks after flowering (the critical period of apple flower bud differentiation, the growth of new shoots is slow or stopped, and the nitrogen content of the leaves is decreasing). dtrend) can increase the nitrogen content of leaves, promote the growth of new shoots, inhibit the differentiation of flower buds, and make the flower amount suitable for large flowering years.

3. In the hybrid rice seed production technology, in order to improve the outcrossing rate of the parents, increase the yield of hybrid rice seeds or the breeding amount of sterile lines, the female parent is usually sprayed with red poison to reduce the neck of the female parent or make it completely pulled out. Or parents are sprayed to regulate their growth and synchronize their flowering period.

4. Due to the high level of gibberellin, the cost of seed production is high. Urea was used instead of gibberellin in the experiment. Urea is used at the peak booting period and at the heading stage (20% heading stage). Its breeding effect is similar to that of gibberellin, without increasing plant height.

Plants and flowers can be watered with urea dissolved in water during the growth period, which can promote the growth of leaves, making the leaves green and thick. Foliar sprays can also be used as foliar fertilizers. However, it is not easy to use urea during flowering and fruiting to prevent the symptoms of withered flowers, flowers, and fruit loss.

Do not adopt.

In use, you can dilute it with water, and you must pay attention to the amount when using, as excessive use will burn the flowers.

Hope it helps......

Yes, fast-growing plants may need nitrogen, but are your flowers deficient?

Some flowers may be missing other elements, such as potassium.

In addition, urea is also a salt, you have to think about the concentration, don't kill the flowers.

Yes, but be sure to pay attention to the dosage.

<> flowers can be applied urea, but not too much. When applying urea to flowers, you can generally use bamboo sticks to pierce some holes in the soil of the flower pot, with a depth of about 5-8 cm, and then put urea granules into it, about 20 grains each time; Alternatively, urea can be diluted in water and foliar sprays can be applied to the flowers 1-2 times a week.

OK. Watering liquid fertilizer mainly contains sugars, organic acids and a small amount of amino acids, vitamins and minerals, which can supplement the nutrition of flowers, but can not completely replace the necessary base fertilizer and top dressing. If 3%O urea solution and 1%O potassium dihydrogen phosphate solution are used in turn for top dressing, the effect is better.

As a neutral fertilizer, urea is suitable for a wide range of soils and plants. It is easy to preserve, easy to use, and has little damage to the soil, and is a chemical nitrogen fertilizer that is currently used in large quantities. Ammonia and carbon dioxide are used in industry to synthesize urea under certain conditions.

Urea is easily soluble in water, 105 grams can be dissolved in 100 ml of water at 20, and the aqueous solution is neutral. There are two types of urea products. Crystalline urea is white needle-like or prismatic crystal, strong hygroscopicity, agglomerates after moisture absorption, and the moisture absorption rate is 12 times faster than that of granular urea.

Granular urea is a translucent particle with a particle size of 1 2 mm, which has a smooth appearance and significantly improved hygroscopicity. At 20 o'clock, the critical moisture absorption point is 80% of the relative humidity, but at 30 o'clock, the critical moisture absorption point drops, so urea should be avoided in the humid climate of midsummer. When hydrophobic substances such as paraffin wax are added to urea production, its hygroscopicity is greatly reduced.

Not good, urea is the top dressing in the fertilizer, often the pot soil is yellow, are the lack of bottom fertilizer and cause the flower pole to be clamped or shortened flowering, most of the black fertilizer, the United States diamine potassium fertilizer, phosphate fertilizer is good, so that the pot soil becomes black, urea on the soil to make it easy to harden white, is not good for flowering?

It is best to use less, because urea is a fertilizer, and it is not good to use too much.

If you don't have to put this every day, you can put less of it. If there is too much urea, the flowers will be burned. will wither.

Be careful to burn the flowers, just once.

<> flowers can be applied urea, but not too much. When applying urea to flowers, you can generally use bamboo sticks to pierce some holes in the soil of the flower pot, with a depth of about 5-8 cm, and then put urea granules into it, about 20 grains each time; Alternatively, urea can be diluted in water and foliar sprays can be applied to the flowers 1-2 times a week.

<> flowers can be applied urea, but not too much. When applying urea to flowers, you can generally use bamboo sticks to pierce some holes in the soil of the flower pot, with a depth of about 5-8 cm, and then put urea granules into it, about 20 grains each time; For those who have a peel or a simple orange, you can dilute urea in water and then spray the flowers with foliar sprays, 1-2 times per week.