Seeing that other people’s crops are growing better, some people secretly observed and bought the same fertilizer, but as a result, the crops did not grow well, but there was a “burning seedlingâ€, the leaves were dehydrated and wilted, and dry coke appeared, and finally the crops Dehydration is serious and dead. Everyone needs to eat, crops have to eat, and fertilizer is the "food" of crops. Whether they grow well or not, the nutrition is uneven. To a large extent, it may be because fertilization is not in place, or fertilization is wrong. If you spend money to buy fertilizer, you won't say it, and the results will be slow, and some will suffer from fat.
However, if you think about it carefully, this is not awkward. You can avoid it. Fertilization, after so many years, have you determined that you are right?
How far is it to apply fertilization?
When determining the fertilization position, the fertilization effect should be ensured according to the growth of the shoots in the shoots and the root growth of the shoots.
If it is a fruit tree, it is generally just below the canopy projection. Field crops are generally controlled from 8 cm to 10 cm.
There are different types of fruits and vegetables, and the fertilization distance will vary. For example, the base of the grape is 40 to 60 cm, and the ditch is about 40 cm.
When some farmers are fertilizing, the closer they are to the plant, the easier it is to absorb the fertilizer. In fact, if the distance is not well mastered, there will be a "burning seedling" in the near future. Far away, the fertilizer has no effect. If the concentration of the soil solution is higher than 100 mg/kg, it will cause the roots of the crop to burn (Rotten Root), commonly known as burning seedlings.
There is a burning seedling, what should I do?
In general, direct foliar spray or spray foliar fertilizer, rooting agent, rooting agent can be combined with water spray to promote rooting of crops, cultivate strong seedlings, and alleviate damage caused by fertilizer.
It is necessary to pay attention to the flooding of large water. If the melons and fruits are in the fruiting period, they should be carefully watered to prevent cracking.
Ways to prevent burning of seedlings are:
(1) According to the crop's needs for various elements of NPK, adopt a reasonable formula to apply base fertilizer and top dressing.
(2) The saline-alkali plots are flooded with large water before sowing, so that salt and other substances can be discharged or infiltrated into the deep layers of the soil. When the soil solution concentration is less than 1000 mg / kg, various crops can grow normally.
(3) Once the signs of burning are caused by excessive fertilization, watering should be timely to reduce the concentration of the soil solution. For melon crops such as cucumbers, the topping of flowers caused by burning roots can be comprehensive measures such as proper watering and room temperature.
Fertilization depth and dosage, also pay attention
If the fertilization is shallow, the fertilizer is easy to volatilize and lose, or it may be difficult to reach the root of the crop, which is not conducive to the nutrient absorption of the crop, and the fertilizer utilization rate is low. In general, the fertilizer should be applied to the seed or the 16 to 26 cm below the side of the plant.
Improper application may cause fat damage, burning seedlings, plant wilting and so on. Excessive application of nitrogen fertilizer, there will be a large amount of ammonia or ammonium ions in the soil, especially in greenhouses. After ammonia volatilization, it will encounter droplets in the air to form alkaline small water droplets, which will burn crops and produce scorch spots on the leaves.
Fertilizer application, don't forget these meanings
(1) Be cautious when applying certain fertilizers, such as dichlorinated fertilizers.
The double-chlorine fertilizer is a compound fertilizer produced by ammonium chloride and potassium chloride. It contains about 30% chlorine and is easy to burn. It should be watered in time.
In addition, saline-alkali and chlorine-sensitive crops cannot be applied with chlorine-containing fertilizers. Excessive application of potassium chloride to leaves (stem) vegetables not only causes the vegetables to be less tender and more fibrous, but also makes the taste of the vegetables bitter, the taste is poor, and the benefits are low.
The urea-based compound fertilizer has high nitrogen content, and the biuret has a slightly high nitrogen content. It is easy to burn the seedlings, and attention should be paid to watering and fertilization depth.
(2) Excessive use of certain nutrients.
This will not only poison the crops, but also hinder the absorption of other nutrients by the crops and cause the lack of toxicity.
For example, excessive nitrogen application can cause calcium deficiency; excessive nitrate nitrogen can cause chlorosis in the absence of molybdenum; excessive potassium can reduce the effectiveness of calcium, magnesium, and boron; excessive phosphorus can reduce the effectiveness of calcium, zinc, and boron. (a), dehydration
Excessive application of chemical fertilizer, or insufficient soil moisture, the soil local nutrient concentration is too high after application, causing water to reverse osmosis from crop cells to the soil, causing the plants to appear wilting, like frost or boiling water, that is, dehydration. Those who are dehydrated are stunted, and those who are dehydrated cause death.
(two), burns
Nitrogen fertilizers such as ammonia water and ammonium bicarbonate are applied at high temperature. Ammonia gas is easy to be volatilized in a large amount. The leaves and young parts of the crop are easily burned. The tip of the leaf is light, the leaf edge is yellow and dry, and the whole plant is red and red, and it looks like a fire.
(three), burning roots
If the amount of fertilizer is too large or lime nitrogen is directly applied, a toxic substance is produced in the process of soil conversion and decomposition, which poisons the growth point of the root tip of the crop, thereby causing crop death. The free acid in the superphosphate exceeds 5%, or the diuretic content in the urea exceeds 2%, causing the roots of the crop to rot and die.
(4) Burning seeds
If the amount of fertilizer containing urea with high nitrogen content such as urea or ammonium nitrate is too large, the germ part of the seed becomes black, and the vitality is lost. Lighter seedlings are slow, and heavy ones lack seedlings and ridges.
(5) High concentration of leaf fertilizer
If the concentration of leaf fertilizer such as urea solution exceeds 2%, and the amount of rare earth acre exceeds 40 grams, the crop will suffer from fat damage.
This article URL: Why are there symptoms of fertilizer damage caused by different fertilizers?
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