Root is the vegetative organ of crops and the source of nutrition for crop growth. It plays a very important role in the process of crop growth and yield formation. The root system of crops can be compared to the human stomach.

Rooting agent is a kind of functional flush fertilizer product that has risen rapidly in recent years. Among them, the main role is to promote plant growth regulators, such as indoleacetic acid, indole butyric acid, naphthoic acid, sodium nitrophenolate, and prochloraz. In addition, the product also contains a lot of mixed elements, or organic nutrients such as chitin, alginic acid, amino acid, humic acid, or various complex microorganisms. Reasonable use can not only promote root growth, enhance root absorption capacity, regulate plant growth, but also supplement some soil nutrients and regulate soil.

The rooting agent has good rooting effect and takes effect quickly. However, as a product that plays a major role in plant growth regulator, it has relatively higher requirements on the use technology, and the requirements on dosage, applicable period and applicable type are relatively strict. Many vegetable farmers are very cognizant of the role of rooting agents. Whether it is dipping, watering or rooting, they will add rooting agents if they have nothing to do. The abuse situation is very prominent, which has seriously affected the normal growth of vegetables. In recent years, the high incidence of premature aging of vegetables is closely related to the abuse of rooting agents. The problem of "only growing roots, not fruit" is also inseparable from rooting agents.

Typical example 1: continuous single use of rooting agent causes premature aging of vegetables

Continuous use of rooting agents alone, especially in the low temperature season in winter, will lead to serious consequences. Although the effect of using rooting agent is obvious in the short term, the rooting agent does not contain or contains little inorganic nutrients. The continuous use of rooting agent makes the soil nutrient supply not replenished, and the nutrient available for root absorption is small. Even if the root system is temporarily increased, the nutrient supply is insufficient, and the problem of premature aging of vegetables will soon occur, especially in a large winter crop of eggplant, sweet pepper, cucumber, etc., which is characterized by yellowing leaves, thinning and shrinking, and slow fruit growth, The yield and quality decreased. Many vegetable farmers do not understand what is going on. They look at the poor growth and increase the amount of rooting agent. As a result, the growth of vegetables is getting weaker and weaker. Finally, they pull out the garden early and change the stubble, resulting in huge losses.

When the price of vegetables is low, the impact of premature aging on the benefits is not particularly large, but the high incidence of premature aging is in winter and spring, which is the time when the price of vegetables is good. So what is the focus of preventing premature aging?

First, timely cover, remove mulch, plough and hoe, and cultivate strong roots.

From planting to uprooting, the growth period of a large crop of vegetables is as long as eight or nine months, and that of extended crop in autumn is also four or five months. The growth period is long and requires a strong root support. However, covering film, watering and fertilizing for many times, and walking back and forth will make the surface layer of the greenhouse soil harden seriously, reduce the permeability, affect the root activity, and cause the root to weaken. It is suggested that vegetable farmers should start from vegetable planting, cover with plastic film at night, and combine with tillage and hoeing to cultivate strong roots; After the temperature rises in spring, the mulch should be removed as soon as possible, and the soil should be ploughed and hoed to break the soil surface hardening and improve the soil permeability. With better soil conditions, the root activity will naturally be strong, and no rooting agent is needed, and the plant will not prematurely decline.

Second, water reasonably and adjust the proportion of topdressing.

Watering is an important part of agricultural operation, and its role is irreplaceable. Vegetables should be watered in combination with water. Watering thoroughly can expand the range of root activity and improve root absorption capacity; Small water can meet the normal growth needs of vegetables, reduce the damage to soil, and ensure the stability of a large number of shallow root activity. In the middle and late stages of vegetable growth, the topdressing should be properly adjusted, the proportion of nitrogen fertilizer should be increased, the balance between vegetative growth and reproductive growth should be maintained, and premature senescence caused by excessive reproductive growth should be avoided. If vegetables grow normally, balanced fertilizer can be applied; If the growth of eggplant is weak, it can be fertilized with high nitrogen, such as 30-10-10, 5-8 kg per mu.

For those with premature aging such as yellow leaves, we should "manage both up and down". The upper leaves were sprayed with 600 times of cytokinin, 500 times of nucleotide foliar fertilizer and 300 times of total nutrient foliar fertilizer to alleviate leaf yellowing; In addition to nutrient type flush fertilization, the root is also combined with the application of rooting agent products containing chitin and alginate. For example, the sea spirit functional fertilizer is widely used. This functional fertilizer not only promotes rapid rooting, but also enhances the absorption capacity of the root system. If necessary, it should also reduce the combination of fruit retention, whole-branch leafing, reduce the burden of the plant, increase the nutrient supply of the root system, and promote the rapid and healthy growth of the plant.

Typical case 2: water soluble fertilizer mixed with rooting agent

Water-soluble fertilizer combined with rooting agent has become the standard configuration for many vegetable farmers when watering, which can not only supplement the nutrients needed for plant growth, but also promote rooting and enhance root absorption capacity.

It's a good match. Is this really the case?

No, under the condition of normal growth of vegetables, only using nutrient fertilizer can meet the needs of vegetable growth. In fact, rooting agent is not necessary. On the contrary, it will lead to excessive plant growth regulators in the soil, and the hormone balance in vegetables will be broken, which is more prone to various problems. Some time ago, the reporter came across a typical example of the reduction of production after continuous application of water-soluble fertilizer and rooting agent. A vegetable farmer in Xidanhe Village, Daotian Town, Shouguang City took tomato seeds with him, reflecting that the tomatoes he planted "only grow roots but not fruit". He pulled them out by hand to see that the root group can have a small pot size, but the fruit expansion of tomatoes is slow and the yield is not high. Although his neighbors are not so good, they don't have many roots, so they will have a small bowl after being pulled out. Tomatoes grow well, and the yield is higher than him. It's strange. It is obvious that only the roots grow without fruit, which is a sign of uncoordinated growth. The nutrition produced by leaves is more transferred to the roots, and the nutrition obtained by fruit is less, which leads to this abnormal phenomenon.

What's the matter? This should start with the current formula of washing and fertilizing. Full-water soluble fertilizer is famous for its fast dissolution and good effect, but its components are still urea, potassium nitrate, potassium dihydrogen phosphate, etc. Although the purity is high and the solubility is good, these components alone, if you want to see the effect from the stems and leaves above the ground, it is not much faster than the general compound fertilizer. It often takes 5-7 days to show on the plant. For vegetable farmers, the intuitive criterion for judging the quality of irrigation and fertilization is the performance of short-term plants after irrigation and fertilization. In order to take effect quickly, plant growth regulators (the main effective ingredients in the rooting agent) are added to the water-soluble fertilizer, such as sodium nitrophenolate, ammonium ester, etc., which can first promote rooting and improve root vitality. With the added inorganic nutrients, it can quickly appear on the plant and let the vegetable farmers see it.

In fact, plant growth regulators have been added to the water-soluble fertilizer, which will take effect quickly but not for a long time after use. If rooting agents are added, the situation of "only growing roots and not growing fruits" may occur when the nitrogen content of manure in the base fertilizer is high.

(Article source: pesticide assistant is only for learning and exchange)