2018年7月11日星期三

Why bacillus subtilis is the most popular biofertilizer?

Bacillus subtilis grows fast.It can produce heat-resistant and stress-resistant spores. It can be made into various dosage forms. It can be mixed with chemical pesticides without inactivation, and the mass production process is simple, the cost is low, and the application is convenient and storage.

bacillus subtilis
The effects of Bacillus subtilis on plants are mainly reflected in the following aspects:


1.Nutrition and space competition

The competitive effects of Bacillus subtilis mainly include nutritional competition and spatial locus competition. It can rapidly and massively multiply and colonize in the rhizosphere, body surface or in the soil and in the soil, effectively reject, prevent and interfere with the colonization and infection of plant pathogenic microorganisms on plants, thereby achieving antibacterial and disease-preventing effects.


2.Produce antibacterial substances

Bacillus subtilis can produce a variety of substances with antibacterial and bacteriostatic activities during the growth process, such as subtilin, organic acids, antibacterial proteins, etc. These substances can inhibit the growth and reproduction of pathogenic bacteria, and even destroy the bacterial structure and kill Pathogens. Therefore, Bacillus subtilis has a good effect on the prevention and treatment of diseases such as double rot, root rot and gray mold.


3.Increase crop’s immune system and growth

Bacillus subtilis can secrete active substances, activate plant defense systems, enhance crop immunity and disease resistance, and reduce or eliminate the harm of pathogenic bacteria to plants.
It can also promote the growth and development of a variety of plant seeds, seedlings and roots, and enhance the disease resistance of plants, thereby indirectly reducing the occurrence of diseases. Such as the increase in the formation of auxin such as indoleacetic acid, stimulate crop root development and enhance photosynthesis. At the same time, the materials that are difficult to absorb in the soil are converted into substances that are easy to be absorbed by the crops, and the absorption and utilization of nutrients by the crops are promoted, and the utilization rate of the fertilizers is improved.


4.Induce plant resistances to dieases

Bacillus subtilis not only directly inhibits plant pathogenic bacteria, but also enhances plant disease resistance by inducing the plant’s own disease resistance potential. For example, B. subtilis, a biocontrol agent against rice sheath blight, can induce the activity of enzymes (POD, PPO and SOD) related to disease resistance of rice leaf sheath cells, and achieve disease resistance.


Why do microbial fertilizers use Bacillus subtilis?

2018年7月10日星期二

Welcome to Dora Agri at 2018 Agroexpo Bogota


2018 Agroexpo Bogota

In 2018,many countries begin to attach importance to environmental protection,then many traditional pesticides are forbidden to sale.

From 2017,Dora Agri foucs on biocontrol solution to reduce the use of traditional pesticides and fungicides.Now great progress has been made in research on biocontrol solution.

If you have interest,Please kindly check the our biocontrol and biofertilizer series.Hope our information will be useful for you,and we are willing to hearing from your reviews.

2018年7月5日星期四

What’s difference between early blight and late blight?

Early blight and late blight are important diseases on solanaceous vegetables.Although the names of the two diseases are only one word difference,some vegetable farmers do not know exactly about early blight and late blight.Some people even think that the two diseases are only happening time different.
There are many problems in the prevention and treatment of diseases.Especially in the selection and use of chemical fungicide,blind drug use not only does not play a role in disease prevention,but delays the best prevention and control time,leading to serious diseases.

early blight and late blight

What’s difference between early blight and late blight?


Early blight mainly affects the stems,leaves,and fruits of vegetables,and is most susceptible to disease at the branches of leaves and stems.At the seedling stage,the base of the stem of the seedlings is dark brown lesions,slightly sunken,and has a ring pattern.The onset of adulthood generally develops from the lower leaves to the upper part.The leaves are infected,the primary brown necrotic small points,and then expanded into a round to nearly round,dark brown,with concentric wheel pattern,the wheel surface has a thorny hair,and some varieties have a yellow-green halo around the lesion.
The disease of the fruit begins in the vicinity of the flower buds.It is mostly elliptical to amorphous brown to black lesions,sag,hard,and dense black mold layer in the later stage.The center of the lesion has a concentric pattern.When it is wet,the black mold layer is the main recognition symptom of the disease.

When the late blight occurs,the plants often die in the short term.The disease can occur in the seedling stage and the adult stage.In the seedling stage,the leaves are dark green water-stained lesions,and the lesions spread from the leaves to the main stem,causing the stems to become thin and dark brown,causing the seedlings to wilting or folding.
When infected in adulthood,it is often the simultaneous onset of stems,leaves and fruits.The stems becomes dark brown and rot-like.There are water-soaked irregular lesions on the leaves.White mold is found in the disease-health junction on the back of the leaves.The fruit,especially the green fruit,has oil-stained lesions.

What’s symptom of grape magnesium deficiency?

grape magnesium deficiency

What’s symptom of grape magnesium deficiency?The leaves are chlorotic.Because magnesium can be transferred to young parts in plants,the top leaves are asymptomatic.
Initially starting from the base blade,the leaf edge turns yellow first,the leaves are water-stained,and the yellow veins are severe.

General reasons

1.The soil is mostly acidic,the pH value is too low,the magnesium leaching is serious,the release of magnesium is obviously inhibited,and the average content of exchangeable magnesium in the soil is lower than the critical level,and the magnesium deficiency is serious.
2.Grapes are potassium-producing crops,but excessive potassium inhibits the absorption of magnesium by the roots of the grapes and transports magnesium ions to the above-ground parts,causing magnesium deficiency.
3.Magnesium and calcium,ammonium ions also have antagonistic effects,therefore,the soil calcium content is too high or the application of calcium and nitrogen fertilizers will reduce the absorption of magnesium by plants.
4.Years of high yields took away a lot of magnesium,but did not replenish in time,resulting in magnesium deficiency.

Other reasons

Many fruit farmers believe that magnesium is a medium-sized element,the demand for grapes is not large,and it only occurs on the old leaves,and the impact on the fruits is small…These misunderstandings are also important reasons for the lack of magnesium in grapes.


2018年7月1日星期日

6 kinds most damaging dieases in watermelon growing

 There are some disease during watermelon plantation,especially in the old melon area where continuous cropping.Recently,many farmers have consulted about the problems related to watermelon disease.Here we sort out watermelon diseases identification and hope it is useful to everyone.

Occurrence period: mainly harm unseeded and freshly emerged seedlings.
Identification points: stem base rot, seedlings tripped, white hyphae when high humidity.




Occurance period: whole growth period
Identification point:1.leaf, brown spotted,slightly depressed,yellow external halo,unaffected by veins, perforated when dry. 2.Fruit,The lesion starts dark green and becomes dark brown,and cracks can occur.

 Occurence period: late growth period
Identification point: lesion becomes from light green to yellow, and then brown, restricted by veins, mildew when wet.

 Occurence period:whole growth period
Identification point: 1.Leaf, from the edge of the leaf, it starts as hot water boil, and the handle is fragile at the later stage.2.Fruit, shrinkage and rot, with stench, white mold.


Occurence period:Extension period, fruit period
Identification point:The diseased part produces white flo.,black rat fecal nucleus.

Occurence period:whole growth period
Identification:The early stage of the lesion is light yellow with yellowish haloes.The middle part of the dark brown middle stage is perforated, and when the humidity is high, the white fungus is thick.
 How to control watermelon dieases caused by fungus or bacteria ?

2018年6月27日星期三

3 ways to build soil crumb structure by yourself?

The main measures to build soil crumb structure


build soil crumb structure





1,Intensive cultivation,increase use of Microbes fertilizer

Intensive cultivation makes the topsoil loose.Although the formed granules are not water-stable,they also play a role in regulating soil porosity.The continuous application of organic fertilizer can promote the formation of water-stable aggregates,and the degree of agglomeration of aggregates is high,various pores are distributed reasonably,and soil and fertilizer can be maintained and improved.

2,Rational rotation

Annual or perennial grasses or leguminous crops,which grow robustly and have developed strong root systems,can promote the formation of soil aggregates.Returning straw,planting green manure,crops and green manure rotation,and paddy crop rotation are all beneficial to the formation of soil crumb structure.

3,Reasonable irrigation,timely cultivation

Flood irrigation can easily damage the soil structure,so that the soil is compacted,and timely cultivating tillage after irrigation to prevent compaction.Timely cultivating,and fully play the role of alternating wet and dry and freeze-thaw cycles,is conducive to the formation of a large number of water instability aggregates,regulate soil structure.