Different Levels Of Boron Research Articles

Mitigation effects of Rhizophagus intraradices and Micrococcus yunnanensis on boron toxicity in maize (Zea may L.) plant

A greenhouse pot experiment was conducted to investigate the effect of arbuscular mycorrhiza fungus and plant growth promoting rhizobacterium on maize (Zea may L.) growth as well as nutrient concentrations under different levels of boron (B). Five levels of B (0, 10, 20, 40 and 60 mg B kg−1 as boric acid) and four levels of microbial inoculants (non-inoculation, Rhizophagus intraradices, Micrococcus yunnanensis, and co-inoculation) were used. Shoot and root dry weights significantly decreased as B levels increased. An increase in plant growth was observed at the levels of 10 and 20 mg B kg−1 due to microbial inoculation especially mycorrhization. Shoot and root dry weights positively correlated with shoot phosphorus concentration and root colonization. At the level of 40 mg B kg−1, root colonization significantly decreased. Shoot iron, copper, sodium and zinc concentrations significantly increased under excessive B concentrations. Totally, B application at low quantity improved plant growth while at higher rates it seemed toxic. Nonetheless, the inoculation of bacterium and arbuscular mycorrhiza had a more alleviative effect when the plant was exposed to excess B.

Effect of Boron Levels and Row Spacing on Growth and Yield of Mustard (Brassica juncea L.)

A field experiment was conducted during Rabi 2021 at Crop Research Farm, Department of Agronomy, SHUATS, Prayagraj (U.P) to evaluate the effect of boron levels and row spacing on growth and yield of mustard (Brassica juncea L.). The soil of experimental plot was sandy loam in texture, nearly neutral in soil reaction (pH 7.2). The experiment was laid out in a randomized block design with nine treatments with three replications. The treatments comprising of different levels of boron and row spacing whose effect was observed in mustard. The results obtained that the application of boron @3 kg/ha plus row spacing of 30cm recorded significantly maximum plant height (192.53 cm), plant dry weight (36.95 g/plant), number of siliquea/plant (314.47), test weight (5.14g), number of seeds/siliquea (15.33), stover yield (4.61 t/ha), seed yield (2.48 t/ha). Therefore, treatment with application of boron @3 kg/ha long with row spacing of 30cm was more productive and can be recommended to farmers after further trails.

Effect of Boron on Growth and Yield Parameters of Cauliflower (Brassica oleracea var botrytis cv Snow Mystique) in Terhathum, Nepal

A study was conducted to determine the effect of different levels of boron on growth and yield parameters of Snow Mystique variety of cauliflower at farmer's field in Myanglung, Terhathum, Nepal during the winter season of 2019 AD. Five levels of boron viz, control (0 kg/ha), 0.5 kg/ha, 1.0 kg/ha, 1.5 kg/ha, and 2.1 kg/ha were applied in the field that was laid out in Randomized Complete Block Design (RCBD) with four replications. Data were recorded regarding plant height, canopy cover, and leaf number at 30, 45, 60, and 75 days after transplanting while yield parameters like curd diameter, curd yield, and biological yield after harvest. Days to curd initiation, days to harvest, and incidence of hollowing were also recorded in this study. Results revealed that boron had significant effect on growth as well as yield parameters of cauliflower, where the value of these parameters were higher at higher boron dose. Boron at the rate of 2.1 kg/ha produced significantly higher curd yield (67.59 t/ha), curd diameter (25.21 cm) and biological yield (72.27 t/ha) whereas the value of these parameters were lowest with control. Similarly, boron had significant effect on incidence of hollowing where the application of boron at the rate of 2.1 kg/ha recorded the minimum incidence of hollowing (15.27 %). Results from this experiment concludes that application of boron at the rate of 2.1 kg/ha could be suggested for cauliflower growing farmers of Terhathum district for increased growth and yield of cauliflower.
 Int. J. Appl. Sci. Biotechnol. Vol 10(1): 41-49.

Carbon-11 Radiotracing Reveals Physiological and Metabolic Responses of Maize Grown under Different Regimes of Boron Treatment.

In agriculture, boron is known to play a critical role in healthy plant growth. To dissect the role of boron in maize metabolism, radioactive carbon-11 (t½ 20.4 min) was used to examine the physiological and metabolic responses of 3-week-old B73 maize plants to different levels of boron spanning 0 mM, 0.05 mM, and 0.5 mM boric acid (BA) treatments. Growth behavior, of both shoots and roots, was recorded and correlated to plant physiological responses. 11CO2 fixation, leaf export of [11C]-photosynthates, and their rate of transport increased systematically with increasing BA concentrations, while the fraction of [11C]-photosynthates delivered to the roots under 0 mM and 0.5 mM BA treatments was lower than under 0.05 mM BA treatment, likely due to changes in root growth. Additionally, solid-phase extraction coupled with gamma counting, radio-fluorescence thin layer chromatography, and radio-fluorescence high-performance liquid chromatography techniques applied to tissue extracts provided insight into the effects of BA treatment on ‘new’ carbon (as 11C) metabolism. Most notable was the strong influence reducing boron levels had on raising 11C partitioning into glutamine, aspartic acid, and asparagine. Altogether, the growth of maize under different regimes of boron affected 11CO2 fixation, its metabolism and allocation belowground, and altered root growth. Finally, inductively coupled plasma mass spectrometry provided insight into the effects of BA treatment on plant uptake of other essential nutrients. Here, levels of boron and zinc systematically increased in foliar tissues with increasing BA concentration. However, levels of magnesium, potassium, calcium, manganese, and iron remained unaffected by treatment. The rise in foliar zinc levels with increased BA concentration may contribute to improved 11CO2 fixation under these conditions.

Yield and economics of mustard as influenced by different levels of boron and zinc (Brassica campestris L.)

An experimental field trial was conducted during the rabi season, 2020 in Crop Research Farm (CRF), Agronomy Department, Naini Agriculture Institute, SHUATS, Prayagraj, Uttar Pradesh, entitled “Effect of boron and zinc levels on growth and yield of yellow mustard (Brassica campestris L.)”. The trial was laid out in Randomized Block Design having nine treatments and three replications. Two factor i.e. boron and zinc having two levels, boron (1&2 kg/ha) and zinc (5&10 kg/ha) consisted along with RDF as NPK and S each at 80:40:40:40 kg/ha respectively. The results revealed that the maximum number of siliqua per plant (86.07), no. of seed per siliqua (40.27), test weight (3.85 g), seed yield (1.95 t/ha), stover yield (2.96) and harvest index (39.70%) was obtained in the treatment T2 (RDF + 1 kg B/ha). The maximum total cost of cultivation (27931.00 Rs/ha) obtained in the treatment T9 (RDF + 2 kg B/ha + 10 kg Z/ha). The maximum gross return (96560.00 Rs/ha) obtained in the treatment T2 (RDF + 1kg B/ha). The maximum net return (69739.00 Rs/ha) and B: C ratio (2.6) obtained in the treatment T2 (RDF + 1 kg B/ha) respectively.

Foliar-applied boron improves flag leaf reserves translocation, pollen viability and yield of aromatic monsoon rice

The planting of monsoon rice (locally known as aman rice) may be delayed due to late heavy rainfall in many regions of South and Southeast Asia resulting in high spikelet sterility with substantial yield loss due to low temperatures during the reproductive stage. Therefore, the study evaluated the performance of foliar-applied boron in mitigating that problem towards sustainable aman rice production. A field experiment was laid out in a randomized complete block design where different levels of boron viz. 0, 50, 100, 150, 200, and 250 ppm were foliar-sprayed at 33 and 47 days after transplanting (DAT) to a popular aromatic rice cultivar Kataribhog grown in late monsoon. Data were collected on phenology, SPAD value at variable dates, pollen viability, boron concentration in leaves and grains, and yield traits and yield. The pollen viability increased by 81.6% for 200 ppm boron. Boron decreased flag leaf weight but increased panicle weight. Simultaneously, it decreased flag leaf SPAD value and subsequent increase in grain yield, which indicates profound flag leaf reserves translocation into the grain. Foliar-applied B at 200 ppm showed a 32.4 and 40.9% increase of B in leaf and grain, respectively, and improved yield attributes resulting in grain yield by 47.0%. The grain yield had strong positive relations with the B content in leaf and grain, and yield contributing characters. The results conclude that foliar-applied appropriate dose of B can reduce spikelet sterility, individual grain weight and eventually enhance grain formation towards increasing yield in late sown aromatic monsoon rice.

Differential Response of Carnation Varieties (Dianthus caryophyllus L.) to Different Levels of Boron under Polytunnels

Carnation (Dianthus caryophyllus L.) is one of the most commercially important cut flowers of the world. It can be used for cut flowers, bedding, edging, boarders, pots and rock garden. Four Spanish carnation varieties were tested with three levels of boron under ultra-violet stabilized polytunnels from August 2017 to April 2018 at Godawari, Nepal. The objective of the research was to evaluate vegetative, floral, and vase life parameters in relations to growth, yield and quality of carnation. The research was conducted in a randomized complete block design with 3 replications. The variety Baltico had the maximum leaf length (19.3 cm), numbers of lateral branches (10.5), internodal length (5.1 cm), flower diameter (8.6 cm), and vase life (24.0 days). The numbers of nodes (5) and flower weight (25.4 g) were highest in the variety Vinco with the lowest cracked area on the stem (0.2 cm2/ crack). The numbers of stem cracks per plant significantly (p ≤0.01) reduced with an increasing level of boron though non-significant relation was observed on 60 ppm and 120 ppm. Variety Baltico was found as a better variety compared to the Vinco, Cervantes and Master varieties according to the vegetative, floral, yield and vase life parameters. Among the levels of boron tested, 60 ppm was found as the optimum dose. Thus, variety Baltico and 60 ppm boron is suggested to be used at the climatic condition of Lalitpur.

“Micronutrient Content in Plant, Its Uptake, and Crop Yield in Cauliflower–cowpea-Okra Cropping Sequence as Impacted by Graded Level of Boron Fertilization”

ABSTRACT For assessing the effect of boron fertilization on the micronutrient concentration in plants, its uptake in edible portion and crop yield in cauliflower–cowpea-okra cropping sequence in an Inceptisol of North East India field experiments were conducted during the year 2015–17 at Horticultural Experimental Farm, Assam Agricultural University, Jorhat. Five graded levels of boron were applied (0, 0.5, 1.0, 1.5, and 2.0 kg ha−1) to cauliflower once in both the years to assess the direct effect of boron fertilization in soil while cowpea and okra were grown as a succeeding test crops to study the concomitant residual effects of boron fertilization in cauliflower–cowpea-okra cropping sequence. Recommended dose of NPK fertilizer along with FYM for each crops were uniformly applied. Among the different levels of boron, experimental findings revealed that application of 2 kg B ha−1 was found prominent in augmenting the highest content of micronutrients in plant parts while the control recorded the lowest content for all the three crops in the sequence. A highly significant positive correlation between the different micronutrients content in edible portion of crops were recorded except copper. Similarly, application of 2 kg B ha−1 exhibited the highest micronutrient uptake in edible portion of crops, crop yield, crop equivalent yield, nutrient use efficiencies, and benefit cost ratio for all the crops in the sequence. Multivariate analysis (PCA) exercised on micronutrients content in edible portion of crops explained up to 97.19% of total variance with two principal components.

Optimizing Boron Seed Coating Level and Boron-Tolerant Bacteria for Improving Yield and Biofortification of Chickpea

Boron (B) is a vital nutrient equally important for plants and human beings. The native soil fertility of arid and semi-arid regions of Pakistan is very low where chickpea is grown on large scale. In such soils, B deficiency is the leading constraint not only for profitable chickpea production but also lead to low B-enriched chickpea grains. Boron seed coating and inoculation with B-tolerant bacteria (BTB) can be effective to improve crop response grown on such soils. Chickpea seeds were coated with different levels of boron (0.0 control; 1.0, 1.5, 2.0, 2.5, and 3.0 g B/kg). Coated and uncoated seeds were divided in two portions and half of these seeds were inoculated with BTB, i.e., Bacillus sp. MN54 while the other half of these seeds were not inoculated with BTB, i.e., Bacillus sp. MN54. Boron seed coating improved seedling growth, nodulation, seed yield, and grain B concentration. Crop response for such characteristics was further augmented with the inoculation of BTB. It was found that seed coating with 1.5 g B kg−1 along with BTB inoculation was the best combination to improve seedling growth, nodulation, and grain yield of chickpea. Higher concentration of B in chickpea seeds was recorded at higher levels of B seed coating (3.0 g B kg−1 soil). Boron seed coating improved grain yield by 9–25% compared with the control treatment. Boron seed coating at lower rates (1.5 g kg−1) along with seed inoculation with BTB Bacillus sp. MN54 seemed a viable option to improve nodulation, growth, yield, and grain B biofortification of chickpea.

Effect of boron and farmyard manure application on boron concentration and dry matter yield of paddy

A pot experiment was conducted to study the effect of boron applied at four levels (viz., 0, 0.5, 1 and 2 kg B ha-1) and FYM applied at 0 and 5 t ha-1 on boron concentration as well as dry matter yield of paddy (var. CAU-R1) grown in an acid soil. Results revealed that irrespective of different levels of boron and FYM, there was an increasing trend of boron concentration and dry matter yield up to harvest. Significantly higher boron was accumulated in paddy grown in soil added with boron over control at different crop growth stages. Interaction of boron and FYM levels had no significant influence on boron concentration during the whole experiment. Application of boron @ 2 kg ha-1 and 5 tonnes ha-1 FYM in combination enhanced the boron concentration and dry matter yield at the latter growth stages of paddy. This shows more agronomic effectiveness of boron when applied in combination with FYM.

Effect of Diets with Various Calcium and Boron Levels in Prelaying Period on Growth, Bone Ash and Subsequent Performance and Shell Quality of Laying Hens

This experiment was conducted to determine the effects of diets with three different levels of calcium (% 0.8, 1.6, 3.2) and four different levels of boron (0, 75, 150, 300 mg kg-1) in prelaying period (14-20 weeks) on growth, bone ash and subsequent performance and egg shell quality of laying hens. A total 864 Super Nick pullets at 14 weeks of age were randomly allocated to twelve treatments arranged in a 3x4 factorial design with six replicates of 12 pullets each. Feed and water provided for ad-libitum access. The tibia samples were taken, three pullets and hens from every replicates at 20 and 42 weeks of age, respectively. Results of the present experiment showed that body weights and body weight gains were reduced in high prelay dietary Ca and B as the main factor. Feed intake of the pullets was not significantly influenced by the treatments. There were no detectable difference in feed intake, egg production, egg mass and feed conversion ratio (g, feed/ g, egg mass) and eggshell weight, but interactive effects of dietary Ca and B levels on eggshell thickness, egg specific gravity and shell breaking strength was significant. Shell thickness and breaking strength were significantly higher in hens fed pre-lay diet with 3.2 % Ca and no supplemental B than other treatments and egg specific gravity was significantly reduced by feeding 1.6 % Ca and 75 mg kg-1 B at 36 weeks of age. Bone ash (g or %) of hens at 20 and 42 weeks of age was not changed by Ca levels or interaction dietary Ca and B levels, but pullets receiving the 150 mg kg-1 B as the main factor had significantly higher in bone ash (g or %) values than other dietary B levels.

Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding

High-entropy alloys (HEAs) are novel solid solution strengthening metallic materials, some of which show attractive mechanical properties. This paper aims to reveal the effect of adding small atomic boron on the interstitial solid solution strengthening ability in the laser cladded CoCrFeNiAlxCu0.7Si0.1By (x = 0.3, x = 2.3, and 0.3 ≤ y ≤ 0.6) HEA coatings. The results show that laser rapid solidification effectively prevents brittle boride precipitation in the designed coatings. The main phase is a simple face-centered cubic (FCC) matrix when the Al content is equal to 0.3. On the other hand, the matrix transforms to single bcc solid solution when x increases to 2.3. Increasing boron content improves the microhardness of the coatings, but leads to a high degree of segregation of Cr and Fe in the interdendritic microstructure. Furthermore, it is worth noting that CoCrFeNiAl0.3Cu0.7Si0.1B0.6 coatings with an FCC matrix and a modulated structure on the nanometer scale exhibit an ultrahigh hardness of 502 HV0.5.

Effect of boron and molybdenum on growth, yield and quality of cauliflower (Brassica oleracea var botrytis) cv. Snowball 16

The experiment was conducted in the experimental field of Department of Horticulture, College of Agriculture, Rewa under Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur during the rabi season 2009-2010. The results showed that morphological characters of cauliflower (Brassica oleracea var botrytis L.) increased significantly with the different levels of boron and molybdenum at every stage of observation. At 60 DAT, the maximum plant height (34.35 cm), number of leaves/plant (19.45), leaf length (32.02 cm), leaf width (28.31 cm) and stem girth (5.14 cm) were recorded in treatment T9, whereas the minimum plant height (32.50 cm), number of leaves/plant (16.49), leaf length (29.07 cm), leaf width (25.72 cm) and stem girth (4.50 cm) were observed in control treatment T1. Yield and quality parameters were also influenced significantly due to various treatments of boron and molybdenum. The highest curd diameter (18.41 cm), fresh- weight of curd (1.24 kg), yield/ha (400.29 q) and dry matter of curd (11.37 %) were recorded in treatment T9, whereas the lowest curd diameter (15.52 cm), fresh weight of curd (0.69 kg), yield/ha (218.28 q) and dry matter of curd (0.69 %) were found in control treatment T1. The treatment T9 was found significantly superior over all the treatments. The treatment T8 registered the maximum ‘A’ grade curds (52.54%) as well as ‘B’ grade curds (35.20%) and the lowest ‘C’ grade curds (12.26%). This was equally followed by T7 and T9 treatments. The lowest ‘A’ grade curds 46.57% were found in case of control treatment T1, this was followed by T2 giving 46.64% ‘A’ grade curds, 33.09% ‘B’ grade curds and 20.01% C grade curds.

Boron doses applied to soil during coffee development

The range between boron deficiency and toxicity in the coffee crop is narrow and the crop toxicity tolerance depends on the soil type, initial soil content and plant age. The objective of this study was to evaluate different levels of boron in the coffee crop during development and grown in a red clayey Oxisol. Treatments consisted of boron applications (zero; 2.48; 4.96; 9.92; 19.8 and 39.68 kg ha-1) in the boric acid form and applied to soil surface in the area of the tree crown projection. The six treatments were outlined in a randomized block design with four replications and ten plants per plot. The cultivar used was Catuaí IAC 144 with sixteen months old, grown in an Oxisol in Campinas, SP, Brazil. Foliar boron content was analyzed as a function of time by regression analysis. The levels in fruit and yield were analyzed by regression according to boron doses. It can be concluded that higher boron doses in the plant can be observed when fruits are at the first development stage. High doses can reduce yield productivity, being each kilogram of applied boron responsible for a reduction of 0.33 coffee bags. ha-1.

Effects of Boron on Structure and Antioxidative Activities of Spleen in Rats

In order to determine the relationship between boron and development of the spleen, especially in the promoting biological effects, we examined the effects of different levels of boron on weight, organ index, microstructure, and antioxidative activities of the spleen in rats. Sprague-Dawley (SD) rats were selected and treated with different concentrations of boron, and then, the organs were resected and weighed. One half of the tissue was fixed and embedded in paraffin to observe tissue structure changes. The other half of the tissue was homogenated for determining the antioxidant activities. The results showed that 40 mg/L of boron could increase weight, organ indexes, and antioxidant capacity of spleens and improve the spleen tissue structure, while the boron concentration above 80 mg/L could decrease weight, organ indexes, and antioxidant capacity of spleens and damage the spleen tissue structure. The higher the concentration, the more serious the damage was. Especially at the concentration of 640 mg/L, it could significantly inhibit the development of the spleen and even exhibit toxic effect. Hence, low boron concentration played a protective role in the development of the spleen, while high boron concentration could damage the organs and even produce toxic effect.

Effect of Supplementation of Drinking Water with Different Levels of Boron on Performance and Immune Organ Parameters of Broilers

This study was performed to investigate changes in growth performance, immune organs weight and microstructure of broilers fed different levels of boron (0, 100, 200 and 400 mg/L) in drinking water for 6 weeks. A total of 240 newly-hatched Gushi chickens [body weight (BW)=34±2 kg; male: female=1:1] were equally divided into 4 treatments with 5 pens each (n=12 per pen). The birds were weighed after fasting for 12 h every two weeks until the end of experiment. The thymus, bursa and spleen samples were collected every two weeks and fixed in 4% paraformaldehyde phosphate buffer at room temperature (25°C). Results showed that BW and average daily gain significantly reduced by addition of 200 and 400 mg/L boron to drinking water compared to control group (P<0.05 or <0.01). Compared to controls, the thymus index of broilers fed 100 mg/L boron increased significantly from 4th to 6th week of age (P<0.05), whereas the weight and immune organs index of broilers fed 400 mg/L boron decreased significantly every week (P<0.05 or <0.01). Microscopic observation showed that the structure of immune organs of broilers fed 100 mg/L boron was well developed from 4th to 6th week of age, and that of broilers fed 200 and 400 mg/L boron was damaged every week. The present study suggests that appropriate supplements of boron (<100 mg/L) could improve the growth of immune organs in broilers after 4 weeks. However, high doses of boron (>200 mg/L) could significantly inhibit the growth of immune organs and even exhibit toxic effects.

Study of Boron Effect on six peanut cultivars using GGE biplot

Superior cultivars have to be identified through multienvironment trials (MET) and chemicals factors in different levels on basis of multiple traits. The study revealed effect of different levels of boron, the chemicals factor, on six peanut cultivars using GGE biplot and GT biplot. GGE biplot analysis of peanut yield explaned 99% and 99.6% of over all variance, for each season, respectively B300 was the highest one. G4 was more variant than others with increase of levels. While G1 , G2 and G3 had slowly variance meant that were more stable.GT biplot illustrated 86.1% and 85.3% of over all variance, for each season, respectively. It graphically displayed the interrelationships among (Y1 and Y6) and ( Y3 , and Y7) and among other traits facilitated visual cultivar comparison and selection for certain environments and chemical growth factors.

EFFECT OF DIFFERENT MICRONUTRIENTS ON GROWTH, YIELD AND QUALITY OF PAPAYA (CARICA PAPAYA L.) CV. RANCHI

The present investigation was carried out to study the effect of different levels of boron (borax at 0.25 and 0.50%), zinc (zinc sulphate 0.25 and 0.50%) and their combinations on growth, yield and quality of papaya cv. Ranchi at the horticulture orchard of Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar, West Bengal. Among the different levels of above micronutrients, application of borax at 0.50% + ZnSO 4 at 0.25% was considered as the best which caused the maximum plant growth (171.62 cm plant height and 39.74 cm girth) and fruit yield (37.20 kg/plant). The maximum values of qualitative parameters in respect of total soluble solids (6.81°Brix), total sugar (6.88%), ascorbic acid (57.11 mg/100 g), β carotene (3327.14 μg/100 g), and TSS-acid ratio (58.41) were also obtained with the same combination.

The formation of AlB 2 in an Al–B master alloy

The formation of borides in an Al–3 wt.%B master alloy, produced via chemical reactions of KBF 4 and aluminium has been investigated. The chemical reactions produce boron, which dissolves into molten aluminium and subsequently forms aluminium borides. Backscattered electron imaging (BEI) of the Al–3 wt.%B master alloy under a scanning electron microscope (SEM) revealed the presence of two types of phases that contain different levels of boron. Combined with X-ray diffraction (XRD) results, the two types of phases are identified as AlB 2 on AlB 12. This gives a direct evidence for a peritectic reaction of AlB 12 and aluminium, which produces AlB 2. The thermodynamic properties of the reactions that may be involved are examined, and the presence of AlB 12 phase in the master alloy explained. The observed microstructure is explained according to the peritectic reaction in an Al–B phase diagram. The stability of AlB 2 and AlB 12 at lower temperature than 975 °C is clarified.

Yield and Yield Attributes of Durum Wheat Genotypes as Affected by Boron Application in Boron-Deficient Calcareous Soils: An Evaluation of Major Turkish Genotypes for Boron Efficiency

Field studies were conducted to determine yield and yield attributes of six durum wheat (Triticum durum Desf.) genotypes namely; Kızıltan-91, Ç-1252, Selçuklu-97, Kunduru-1149, Yılmaz-98, and Çakmak-79, as affected by applications of different levels of boron (B) (0, 1, 3, and 9 kg B ha−1 delivered as boric acid, H3BO3) in soils deficient in available B (0.19 mg B kg−1) and high in lime (CaCO3) content (20.7%) during two consecutive growing seasons; 2000–2001 and 2001–2002. Agronomic characteristics such as grain yields, spike sterility rates, number of grains per spike, number of spikelets per spike, number of spikes per m2, grain weight per spike, thousand grain weights, test weights, and flag leaf B concentration were investigated. Grain yields in all genotypes were significantly increased by B applications compared to the control. Applications of 1 and 3 kg B ha−1 increased yield an average of 11 and 9% respectively, while 9 kg B ha−1 resulted in lower overall yield increase (7%). Genotypes studied have shown significant variations with respect to their responses to additional B. Kunduru-1149 and Çakmak-79 gave the highest grain yield (4080 and 4315 kg ha−1 respectively) at 1 kg B ha−1, whereas Kızıltan-91 and Yılmaz-98 yielded best (4475 and 5010 kg ha−1 respectively) at 3 kg B ha−1. Interestingly, other two genotypes, Ç-1252 and Selçuklu-97, reached to the highest level of grain yield (4320 and 4360 kg ha−1 respectively) at the highest B level (9 kg ha−1). Yield attributes also showed significant variations with respect to their responses to B application. Kızıltan-91 and Kunduru-1149 appeared to have high sensitivity to B deficiency. On the other hand, Çakmak-79 and Selçuklu-97 were B deficiency tolerant genotypes. The study clearly showed that B deficiency could result in significant yield losses in durum wheat under experimental conditions tested. Hence, B contents of soils for the cultivation of durum wheat should be analyzed in advance to devoid of yield losses. Plant tissue analyses can also result in grain yield predictions. Genotypes proven as tolerant/sensitive to high/low B levels may offer valuable genetic materials for use in B-related breeding programs. Considering relationships between flag leaf B concentrations and grain yield, it was clear that when climatic conditions (second year) suit wheat cultivation, B application in B-deficient soils can make profound contributions to grain yield in wheat compared to adverse climatic conditions (first year). Clear positive contribution of B application to grain yield in durum wheat can be more evident under better climatic conditions.