Most jujube varieties tend to develop fruit cracks during the ripening stage, with the most severe cracking occurring when the fruit's skin begins to turn red and continues through full red maturity. This cracking not only affects the fruit's appearance but also increases the risk of pulp rot, leading to significant economic losses for growers. Below are the main causes of fruit cracking and effective control measures:
First, the primary causes of cracking:
1. High temperatures and drought are major contributors. In northern jujube-growing regions, the fruit reaches the white-mature stage between mid-August and early September. During this period, if a drought occurs, high temperatures and excessive transpiration can cause the fruit to lose water faster than it can be replenished. This leads to daily burns on the fruit's surface. These tiny wounds, if exposed to rain or nighttime condensation, allow moisture to seep into the flesh, causing the cells to swell. As a result, the skin bulges around the burn site. Experience has shown that in dry years, when the rainy season ends early, fruit cracking becomes more common between mid-August and early September.
2. Farming practices also play a role. Many jujube farmers apply fertilizers uniformly across the orchard, often at shallow depths, which encourages shallow root growth. Most jujube roots are found in the top 0–20 cm of soil. During droughts, this shallow root system struggles to access sufficient water and nutrients, increasing the likelihood of fruit cracking. Studies have shown that orchards with deep-rooted systems and well-distributed soil moisture experience less cracking or none at all.
Second, prevention and control measures:
1. Choose crack-resistant jujube varieties. Selecting suitable cultivars is one of the most effective long-term strategies.
2. Ensure proper irrigation during the fruit ripening period. Maintain soil moisture levels in the 0–40 cm layer at 14% or higher. If the level drops, provide additional water promptly.
3. Apply mulch to the soil surface. This helps retain moisture and regulate temperature, reducing stress on the trees.
4. Improve fertilization methods. Instead of broadcasting fertilizer, use techniques like trenching or acupuncture to encourage deeper root development, improving the tree's ability to absorb water and nutrients.
5. Apply boron and calcium supplements. These nutrients help strengthen the fruit's peel, making it more resistant to cracking.
6. Treat cracked fruits promptly. After cracking occurs, spray a bactericide such as DuPont Fuxing (diluted 8000 times) once or twice to prevent pulp rot. Field trials have shown that this treatment significantly reduces the incidence of rotten fruit following cracks.
Fixative (dye-Fixing Agent)
Active Ingredient: Quaternary ammonium salt cationic surfactant
Chemical Name: Formaldehyde-free Fixing Agent
Chemical Family: PolyDADMAC
CAS No.: 26062-79-3
1.Formaldehyde-free Fixing Agent
2.Has no free formaldehyde,no peculiar smell,no irritation to skin, accord to eco request
[Description]:
Formaldehyde-free Fixative Color Fixing Agent is belongs to polymerization polyDADMAC, a cationic polymer. It can make up of macromolecular compound with dye, then achieve to improve soaping and rub fastness of fabrics. It can be used for color fixing for dyeing and printing of reactive dyed fabrics as cotton, linen, silk, and direct dyed fabrics.
[Specification]:
Appearance: Brownish yellow viscous liquid
Ionic character: Cationic
PH Value: 5-8 (1% aqueous solution)
Dissolution: Dissolve in cold water easily.
Composition: Special polymer compound
[Dilution Method]:
With 4-6 times the water and stir to dissolve dilution.
[Direction for Usage]:(To dilute finished product as an example)
A. Padding Process: 5-20g/L, temperature 40°C-60°C, PH Value:5-8, One-dip-one-nip or Double-dip-double-nip.
B. Dipping process: 1-4% (O.W.F), Room temperature 40°C-60°C, PH Value:5-8, bath ratio:1:8-12,Time: 20-30 min.
[Properties]:
1. Concentrated Formaldehyde-free Fixative Fixing Agent has good color fixing property, can obviously improve the dyeing or printing of fabric soaping, washing fastness and wet rubbing fastness.
2. Can be used for much of the association between dye fixation, anti fading property, does not affect the dyeing or printing of fabric vividness. No effect for the original feel, processing fabric has excellent hydrophilic.
3. Formaldehyde-free Fixative widely used for dyeing or printing of the direct, active dye fixing finishing, good fixation effect, especially for the red dye and Cuilan dyes, particularly prominent, fixation is better than the general Formaldehyde-free Fixative.
4. The dye PH value for a wide range, acid, alkali resistance, resistance to hard water, high temperature resistance, an environment-friendly products, does not contain formaldehyde.
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Specifications:
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Appearance:
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Colorless, Transparent Colloid
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Viscosity:
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100cps-80000cps
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Solid Content:
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40%min.
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PH (30% solution):
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3 - 7
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Ionic Nature:
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Cationic
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Specific Gravity:
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About 1.1
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Package and Storage:
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It is harmless, no-flammable and non-explosive, it can be stored at room temperature, it can not be placed in the sun.
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It is packaged in plastic drums with each containing 25kg, 210kg, 1100kg , or others according to the requirements of clients.
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Storage temperature: 5-30°C.
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The product would show slightly stratification or appear white at low temperature. There is no negative impact on the performance after mixing up.
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Fixative,Dye-Fixing Agent,Organic Dye-Fixing Agent,Reactive Dye-Fixing Agent
Shandong Tiancheng Chemical Co., Ltd. , https://www.tianchengchemical.com