1、Influence of boron fertiIization on productivity of grape plants

Fertilizing with boron is an effective agricultural technique for up-frost plants and productivity of grapes. This technique allows to increase the sugar content of the berries up to 0.8– 1.4g/cm3, while substantially reducing the acidity of the juice.

2、Freeze Injure and Antioxidant Enzyme Activity of Grapevine (Vitis Vinifera) Under Bio

Bio-B fertilizer has been applied in different ways as soil + foliar, soil and foliar application methods to grapevine plants. Data through 2 years trials results showed that the use of Bio-B significantly decreased freeze injury and increased antioxidant enzyme activity of grapevine leaf.

3、Drip irrigation can effectively apply boron to San Joaquin Valley vineyards

Boron deficiency of grapevines occurs occasionally on the east side of the San Joaquin Valley. Its symptoms include shot berries, shoot-tip dieback and leaves with yellowish mottling between veins.

4、Guidelines for fertilizer use in vineyards based on nutrient content of grapevine parts

Plant analysis plays a major role in fertilizer recommendations for perennial tree crops and vines. Plant analysis, however, does not quantify the rate of nutrients to apply.

5、Fall foliar sprays prevent boron

Foliar spraying was found to be an effective method to rapidly increase boron levels in most vegetative and reproductive tissues in grapevines. The reduction of fruit-set deficiency symptoms with a pre-bloom or bloom spray was immediate but not complete.

Vine growth, yield, berry quality attributes and leaf nutrient content of grapevines as influenced by seaweed extract

Overall investigations revealed that nano-fertilizer had particular contribution to improvement of vine growth, yield, berry quality attributes and leaf nutrient content of grapevines (cv. ‘Narince’) grown under alkaline soil condition.

IMPACT OF BORON DEFICIENCY ON PLANT GROWTH

Boron may be applied to the soil as a straight boron material such as borax, or it may be purchased mixed with a fertilizer. Alternatively it can be dissolved in water and sprayed on to the crop or the soil.

The occurrence and correction of boron deficiency

Boron deficiency can be readily prevented and corrected by both soil and foliar applications. Most reliance is placed on refined sodium borates, but crushed ores are used both in the manufacture of boronated fertilisers and on their own.

MODIFIED DRIS

In a long term field fertilizer experiment Sufficiency Range (SR), DRIS norms (Beaufils), and the DRIS CND approach were compared. The CND norms reflected well the responses of different vineyards receiving quite different fertilizer treatments.

Potential use of winter green manure species for nitrogen recycling by ‘Niagara Rosada’ grapevines

In this context, the study aimed to determine whether the use of cover crops during winter can contribute to N provision in the following spring, in the beginning of the growth of young grapevines.

Boron is one of the essential micronutrients for plant growth, playing a critical role in the development of grapevines and the quality of their fruits. When grapevines lack boron, a series of physiological and biochemical reactions occur, adversely affecting normal growth and fruit quality. timely diagnosis and boron supplementation are crucial for the healthy growth of grapevines.

I. Symptoms of Boron Deficiency in Grapevines

1. Leaf Symptoms: In the early stages of boron deficiency, leaf edges may yellow or develop brown spots, progressing to full leaf browning and necrosis. This occurs because boron is involved in chlorophyll synthesis during photosynthesis; its deficiency directly impairs chlorophyll production and leaf function.

2. Stunted Shoot Growth: Boron-deficient shoots grow slowly or cease developing. Boron regulates enzyme activity during cell division and elongation; its absence disrupts these processes, inhibiting shoot growth.

3. Poor Fruit Development: During fruit maturation, boron deficiency leads to smaller, misshapen fruit with uneven skin thickness and discoloration. Boron participates in metabolic pathways like starch synthesis and cellulose degradation; its deficiency disrupts these processes, reducing fruit quality.

4. Root Development Issues: Long-term boron deficiency weakens root systems, causing roots to become thin, brittle, and inefficient at absorbing water and nutrients. Boron is critical for cell wall synthesis in roots; its absence reduces cell wall strength, hindering root growth.

II. Diagnosing Boron Deficiency in Grapevines

1. Observe Leaf Symptoms: Inspect leaves, especially edges, for yellowing or brown spots—key indicators of boron-related stress.

2. Test Soil Boron Levels: Use borate test strips or boron powder immersion methods to measure soil boron content. Deficiencies suggest the need for supplementation.

3. Consult Agricultural Experts: Seek guidance from local agricultural technology extension departments or horticulturists, who can provide insights into soil boron levels and tailored recommendations.

III. Corrective Measures and Methods

1. Apply Boron Fertilizers: Based on soil tests, supplement boron via:

   • Soil Application: Use boron-containing fertilizers like borax or calcium borate.
   • Foliar Spraying: Apply borate solutions directly to leaves for rapid absorption.

2. Adjust Irrigation Water: Increase boron concentration in irrigation water, especially during dry seasons, to enhance uptake.

3. Prune Affected Stems: Remove boron-deficient branches to reduce nutrient competition and improve overall plant health.

4. Balanced Fertilization: Ensure adequate nitrogen, phosphorus, and potassium during critical growth stages (e.g., flowering). Avoid excessive nitrogen, which can inhibit boron absorption.

5. Optimize Management:

   • Maintain suitable soil humidity and pH for stable boron availability.
   • Prevent overcrowding to ensure sufficient light and airflow, boosting boron uptake.

6. Biological Pest Control: Use microbial-based pesticides (e.g., against aphids) to reduce nutrient competition and indirectly support boron absorption.

boron deficiency is a common nutritional disorder in grapevines. Comprehensive diagnosis and intervention—including fertilization, irrigation, pruning, and management adjustments—are essential to restore plant health and promote recovery.