Bitkisel ve Hayvansal Üretim Bölümü Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12514/201

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Fieldscout CM 1000 klorofilmetre’nin makarnalık buğdayda tane verimi ve azot kullanım etkinliğini belirlenmede kullanabilirliği
(2020) Kızılgeçi, Ferhat; Öztürk, Ferhat
This study was conducted to investigate the relationship between chlorophyll values of the CM 1000 FieldScout and nitrogen use efficiency, grain yield of some durum wheat cultivars grown in different nitrogen conditions. The research was set up in four replications according to the split plot design in the conditions of Diyarbakir during the growing season of 2017-2018. In this study, stem elongation stage, heading stage, anthesis stage, 10 days after anthesis and 20 days after anthesis Chlorophyll measurement, nitrogen use efficiency and grain yield were investigated. As a result of the study, the highest nitrogen use efficiency was obtained at 0 kg/da (N0) nitrogen application. Significant relationships were determined between the values measured with CM 1000 chlorophyll meter and nitrogen use efficiency and grain yield in N0 nitrogen application, stem elongation, heading and flowering stage in terms of grain yield and nitrogen use efficiency. In nitrogen application at 15 kg/da (N3), significant correlations were found between the values measured with CM 1000 chlorophyll meter and grain yield and nitrogen use efficiency during the heading stage. Especially at low nitrogen doses. It was concluded that it would be appropriate to use the CM 1000 chlorophyll meter to determine the nitrogen use efficiency and grain yield.
Grain yield and quality performance evaluation of bread wheat (Triticum Aestivum L.) In Diyarbakir, South-Eastern Turkey
(2020) Kızılgeçi, Ferhat; Öztürk, Ferhat
under rain fed condition during 2018 and 2019 main cropping season. The study was investigated to assess the adaptability of eight bread wheat genotypes. The study was investigated to assess the adaptability of eight bread wheat genotypes. The field experiment was laid out in a Randomized Complete Block Design (RCBD) with four replication for one year (2018 and 2019) on a plot size of 4.8 m2 (six rows at 20 cm spacing and 4 m length). Analysis of variance revealed that there was a highly significant difference among the genotypes for all traits. It was found that Empire plus (6631.4 kg/ha) showed best yield performer.
The possibility to use three portable chlorophyll meters to estimate grain yield in rain-fed conditions
(2021) Kızılgeçi, Ferhat; Yıldırım, Mehmet
Handheld spectroradiometers are used to estimate the canopy's reflective properties, the condition of the plants. In this study, the potential use of three devices (SPAD, Greenseeker and CM 1000 chlorophyll meter) was compared that can estimate indirect the chlorophyll content of the leaves. The present research was established in four replications according to the randomized complete block design in the rain-fed conditions of Diyarbakir in the growing season of 2019. Seven barley cultivars were used as plant material. Chlorophyll measurements from leaves were taken in 2 different plant growth periods (anthesis and milky stage). Greenseeker showed changes between 0.51-0.75 in anthesis and 0.43-0.6 at milk stage. SPAD varied between 30-47.3 in anthesis and 27.6-46.7 in milk stage. CM1000 ranged from 217-548 in anthesis, 121-370 in milk. It was observed that the amount of chlorophyll in the leaf decreased in the milk period compared to the anthesis period. Significant regression relationships were determined with SPAD and greenseeker during anthesis R2 = 0.194* and greenseeker and grain yield at anthesis period R2 = 0.151*. As a result of the study, a significant relationship was found between only grain yield and greenseeker during the anthesis period under rain-based conditions. It has been observed that there is no relationship between other measuring portable devices and grain yield.
Assesment of yield and yield traits of advanced bread wheat (Triticum aestivum L.) lines in semi-arid condition
(2021) Kızılgeçi, Ferhat; Yıldırım, Mehmet
In this present study, variation range for grain yield, some yield traits and quality traits of some bread wheat lines (Triticum aestivum L.) selected among preliminary yield trials in -2020 growing season, in order to determine outstanding wheat lines and use them in the bread wheat breeding program. One hundred five wheat lines including five check cultivars were used as genetic material. This experiment was conducted under Augmented Experimental Design consisting of four blocks of which every block has twenty five plots. According to minimum and maximum values of the lines, there was a great variation for plant height 70.8-128.4 cm; spike length 6.1-13.6 cm; spikelet number 3.2-53.4; grain number per spike 21-70.8; thousand kernel weight 24.2-43.8 g; protein ratio 8.4-18.1%; starch 78.4-89.8 % and grain yield 46-590 kg-da-1. In the evaluationusing the Biplot graph, grain yield, thousand kernel weight, starch and test weight were involved in the same group while protein content, were involved in the other group. Using UPGMA (The unweighted pair grouping method of arithmetic averages) to cluster data it was seen that bread wheat genotypes were grouped into five cluster. The result of the analysis indicated that for bread wheats the highest similarity was between G81 and G92 whereas the genetic distance between G1 and G58 was the lowest. According to the results of research, some promising and superior lines were selected for yield trials when compared to check cultivars.
Evaluation of advanced bread wheat (Triticum aestivum L.) lines with biplot analysis method
(2021) Kızılgeçi, Ferhat; Yıldırım, Mehmet
In this research, variation range for yield, some yield components and quality traits of some bread wheat lines (Triticum aestivum L.) selected among preliminary yield trials in -2020 growing season, in order to determine outstanding winter wheat lines and use them in the bread wheat breeding program. Thirty five wheat lines including five check cultivars were used as genetic material. This experiment was conducted under Augmented Experimental Design consisting of two blocks of which every block has twenty plots. According to minimum and maximum values of the lines, there was a great variation for plant height 75-112.8 cm; spike length 6.9-13.6 cm; spikelet number 13.2- 23.4; grain number per spike18.8-68.6; thousand kernel weight 25.2-46.8 g; protein ratio % 9.9-17.4; starch % 80.5-88.3; and grain yield 184.9-624.8 kg-da-1. In the evaluation using the Biplot graph, grain yield, thousand kernel weight, starch and test weight were involved in the same group while protein content, were involved in the other group. Using UPGMA (The unweighted pair grouping method of arithmetic averages) to cluster data it was seen that bread wheat genotypes were grouped into five cluster. The result of the analysis indicated that for bread wheats the highest similarity was between G13 and G33 whereas the genetic distance between G1 and G29 was the lowest. According to the results of research, some promising and superior lines were selected for yield trials when compared to check cultivars
Evaluation of winter/facultative wheat germplasm for the Diyarbakir wheat growing region on the basis of yield, quality, and agronomical traits
(2021) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat; Öztürk, Ferhat
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Assessment of variety releasing performance from winter wheat germplasm at Diyarbakir condition
(2021) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat; Öztürk, Ferhat
Spring wheat genotypes have been successfully grown with global climate change in the mate dominates. In the cold winter season, however, yield losses in spring wheat genotypes are occasionally reported. In order to solve this problem, wheat genotypes that are resistant to winter damage and suited for spring growing type must be identified. The focus of this research was to determine how winter ratio, plant height, spike length, spikelet number, spike grain number and grain weight variability of 50 wheat genotypes were ranged between 157.2- 494.7 kg da-1, 9.33-14.57 %, 82.7-88.9 %, 56-102.3 cm, 6.3-12.5 cm, 13.8-23.6, 30.6-64.4 and 28.2-56.6 g, respectively. The findings suggest that there is a large genetic variation in the traits studied, and that suitable wheat genotypes can be discovered either directly or through breeding research. According to the cluster analysis, clustering the genotypes by cutting the dendogram into 6 groups will improve genotype selection for hybridization and allow for more genotypic variation to be benefited from. The significant association between protein content and grain yield suggests that high-yielding and high-quality cultivars can be identified. The parameters controlling the grain number have a favorable impact on grain yield, while grain weight has a negative impact, according to the component analyses. The findings suggest that winter wheat trial sets can be used to identify genotypes suitable for spring type conditions.
The effects of boron on rice in the early stages of germination
(2022) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat
Bor (B), özellikle çeltiğin üreme devresinde önemli bir mineraldir. Bu araştırma borun çeltiğin çimlenmesi ve erken gelişim dönemindeki etkisini değerlendirmek için yürütülmüştür. Deneme tesadüf parseller deneme desenine göre üç tekerrürlü olarak düzenlenmiştir. Çalışmada “Osmancık-97” çeltik çeşidine altı farklı seviyede (0, 0.2, 0.4, 0.8, 1.6 ve 3.2 ppm) bor ile muamele edilmiştir. Araştırmada; kök uzunluğu, fide uzunluğu, kök yaş ağırlığı, kök kuru ağırlığı, fide yaş ağırlığı ve fide kuru ağırlığı, çimlenme hızı, çimlenme gücü, sürme hızı ve sürme gücü özellikleri incelenmiştir. Varyans analizi sonuçlarına göre; fide kuru ağırlığı, çimlenme gücü, sürme hızı ve sürme gücü bor uygulamalarından önemli ölçüde etkilenmiştir. Sonuç olarak, 0.2 ppm konsantrasyonda B uygulamasının fide kuru ağırlığı üzerinde olumlu bir etki gösterdiği görülmüştür. Çimlenme aşamasında ise 0.2 ve 1.6 ppm bor uygulamaları olumlu etkiye sahip olmuştur.
An assessment of the yield and quality of cimmyt origin bread wheat genotypes under heat stress environment
(2022) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat; Öztürk, Ferhat
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The adaptability of various bread wheat genotypes exposed to heat stress by late sowing under Diyarbakır growth
(2022) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat; Öztürk, Ferhat
a
Wheat germination and early seedling period are affected by different doses of boron fertilizer
(2021) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat
a
Effect of different boron concentrations on germination and seedling stage of soybean[Glycine max (L.) Merr]
(2021) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat
Boron (B) is a micro element needed by plants in small amounts and its deficiency and toxicity limits are very close to each other. The main goal of this study was to examine the effects of different boron applications on germination/emergence and seedling development parameters of soybean [Glycine max (L.) Merr]. Six different boron doses (0, 0.2, 0.4, 0.8, 1.6 and 3.2 ppm) were applied to seed for this purpose. Turksoy variety seeds were used as the plant material. In this study, germination rate, germination vigor, seedling rate, seedling percentage, root length, seedling length, root fresh weight, root dry weight, seedling fresh weight and seedling dry weight were investigated. According to the results of analysis of variance; the effect of B concentrations on germination rate, root length, stem length, root fresh weight, stem fresh weight was significant at 5 % probability level. As a result, the application of B at 3.2 ppm concentration showed a positive effect on the germination and characteristics of seedlings average root length. Germination and seedling developments are positively affected by high levels boron.
AGRONOMICAL, MORPHOLOGICAL AND PHYSIOLOGICAL RESPONSES TO HEAT AND DROUGHT STRESS IN WHEAT: A REVIEW
(2022) Kızılgeçi, Ferhat
Wheat (Triticum aestivum L.) is one of the crucial crops in the world in terms of economy, production, food, and nutrition (Yilmaz et al.2022). Wheat is grown in over 220 million ha of land all over the world, where it is subjected to abiotic stress on average (Paudel et al., 2021). This accounts for approximately 30 percent of the world's total cereal area (Cossani and Reynolds, 2012). FAO estimated that annual cereal production must increase by nearly a billion tons in order to feed the projected population of 9.1 billion people in 2050. The 21st century requires an increase in crop production and productivity to meet the rising demand for food (Iqbal et al., 2017). Wheat is cultivated in the tropics and subtropics, where it is subjected to a wide range of abiotic pressures. Crop yields are drastically diminished due to adverse environmental stress (Rahaie et al.,2013). The most common abiotic stresses are heat, drought, salinity, cold, chemicals, and excess water. But heat and drought are the main abiotic stresses that affect wheat production around in the world (Liu et al., 2016; Kizilgeci et al., 2017). Considering global climate model, the average worldwide temperature is projected to have risen by 6 degrees Celsius by the end of the twenty-one century (De Costa, 2011).
Assessment of Yield and Quality of Some Triticale Genotypes in South-Eastern Anatolia
(2019) Kızılgeçi, Ferhat
This research was conducted to assess of yield and its component in different locations some triticale genotypes. The field experiment was arranged to the randomized complete block design with four replications during the 2012-13 growing seasons under Diyarbakir and Mardin ecological conditions. Three triticale cultivars (Ege Yildizi, Fahad-5 and Karma 2000) and two advanced lines (Line DZT-01 and Line DZT-06) were used as material. SPAD, protein content, test weight, thousand kernel weight, starch content, wet gluten, zeleny sedimentation and grain yield were evaluated. According to the findings of research, genotypic differences were found significant for SPAD, grain yield, thousand kernel weight and test weight. The values ranged in genotypes were between 51.8-57.3 in SPAD, 5043.9-6469.3 kg ha-1 in grain yield, 35.31-45.81 g in thousand kernel weight, 71.38-78.72 kg hL-1 in test weight, 13.1-13.7% in protein content, 64.27-65.94% in starch content, 28.71-30.61% in wet gluten and 40.42-45.67 mL in zeleny sedimentation. Significant positive correlation between protein content with gluten content and zeleny sedimentation in both locations was found. With regard to grain yield and some quality traits of Line DZT01 and quality traits of Line DZT-06 were highest than commercial cultivars in both locations. Line DZT 01 and Line DZT-06 were found as promising line. These lines can be new cultivar candidates and could be recommended to sown in South-Eastern Anatolia Region of Turkey.
Enhancing Drought Tolerance in Camelina Sativa L. and Canola (Brassica Napus L.) Through Application of Selenium
(Pakistan Botanical Society, 2020) Ahmad, Z.; Kızılgeçi, Ferhat; Waraich, E.A.; Barutçular, C.; Alharby, H.; Bamagoos, A.; Kizilgeci, F.; Sabagh, A.E.
Considering the burning issue the present study was undertaken in pot culture at the Cholistan Institute of Desert Studies (CIDS), The Islamia University of Bahawalpur, Pakistan for enhancing drought tolerance in two oilseed crops (OC) crops camelina (Camelina sativa L.) and canola (Canola napus L.) through improving physiological, biochemical, and antioxidants activity by foliar application of selenium (Se) under drought stress. Two Camelina (i.e.] ‘Australian Camelina’ and ‘Canadian Camelina’) and canola genotypes (i.e.] ‘AARI Canola’ and ‘UAF Canola’) were used as plant materials during the growing season of 2016. Both Camelina and Canola genotypes were grown under normal (100% FC) and water deficit (drought stress) (40% FC) conditions. Four levels of Se: such as seeds priming with 75μM Se, foliar application of Se at 7.06 μM and foliar Se in combination with seeds priming (7.06 μM & 75μM) along with control were applied at the vegetative stage of both OC crops for screening drought tolerant genotypes. All treatments were arranged three times in a randomized complete block design. Both OC crops were grown upto the maturity and data on physiochemical, antioxidants and yield components were recorded during this study. Results of the present study indicated that the physio-biochemical parameters such as WP (water potential), OP (osmotic potential), TP (turgor pressure), proline, TSS (total soluble sugar), TFAA (total free amino acids), TPr (total proteins) and TS (total sugars); [and total chlorophyll contents were improved by foliar application Se along with seed priming by Se in both OC crops in both drought stress and non-stress (control) conditions. Similarly, osmoprotectants such as GB (Glycinebetaine), anthocyanin, TPC (total phenolic contents) and flavonoids; [as well as antioxidants such as APX (ascorbate peroxidase), SOD (superoxide dismutase), POD (peroxidase) and CAT (catalase) were also showed better enhancement in both OC crops through foliar application in combination with seed priming with Se (7.06 μM & 75μM) under normal as well as water deficit (drought) conditions. Yield and its components i.e.] branches plant-1 (no.), 1000-seed weight (g), seed and biological yield (t ha-1) of both OC crops were increased through foliar application in combination with seed priming by Se (7.06 μM & 75μM) under drought and non-drought stress conditions. Both camelina and Canola genotypes categorized based on all the above-mentioned parameters under the water deficit (drought stress) condition and foliar application of Se, the genotype ‘Canadian Camelina’ maintained the highest values for all these attributes. Therefore, it is revealed that foliar application in combination with seed priming by Se helps to improve drought tolerance of OC crops and also leads to an increase in the productivity of crops under drought stress. Among the genotypes, ‘Canadian Camelina’ performed the best when seeds of the genotypes were primed with Se in combination with foliar application of Se at the vegetative stage. © 2020, Pakistan Botanical Society. All rights reserved.
Phenology, Growth and Yield Are Strongly Influenced by Heat Stress in Late Sown Mustard (Brassica Spp.) Varieties
(Pakistan Botanical Society, 2020) Bazzaz, M.M.; Kızılgeçi, Ferhat; Hossain, A.; Farooq, M.; Alharby, H.; Bamagoos, A.; Nuruzzaman, M.; El Sabagh, A.
In rice-based cropping system of northern Bangladesh, mustard planting is delayed due to late harvest of monsoon rice (Transplanted Aman rice; [T. Aman rice). The late sown mustard is often exposed to high-temperature stress during the reproductive stage, which causes a significant decrease in seed yield. Most of the farmers plant a low yielding local mustard variety ‘Tori-7’, which is sensitive to high-temperature stress. The Oil Seeds Research Centre of Bangladesh Agricultural Research Institute has recently released short duration and high-yielding mustard varieties for the rice-based cropping system of northern Bangladesh to tackle this issue. However, the performance of these varieties in the target cropping system under late sown conditions (together with exposure to heat stress) has not been evaluated yet. Therefore, this two-year field experiment was conducted to assess the performance of newly released mustard varieties ‘BARI Sarisha-14’ and ‘BARI Sarisha-15’ in comparison with the local check variety ‘Tori-7’ sown at five planting dates (viz. October 21, November 1, November 10, November 20, and November 30). The delay in sowing shortened time (days) to flowering and maturity, regardless of the variety. Similarly, plant height, branches/plant and total dry matter accumulation of the tested varieties were also reduced upon delay in planting. The greatest seed yield was observed in varieties ‘BARI Sarisha-15’ and ‘BARI Sarisha-14’ when sown on October 21. These two varieties produced fair seed yield when sown at November 20. However, the local variety ‘Tori7’ yielded the least across all the planting dates. Therefore, the varieties ‘BARI Sarisha-14’ and ‘BARI Sarisha-15’ may be planted in the rice-based cropping system of northern Bangladesh after harvest of T. Aman rice to get maximum seed yield. © 2020, Pakistan Botanical Society. All rights reserved.
Evaluating Short Stature and High Yielding Maize Hybrids in Multiple Environments Using Gge Biplot and Ammi Models
(Society of Field Crops Science, 2020) Ahmed, A.; Kızılgeçi, Ferhat; Hossain, A.; Amiruzzaman, M.; Alam, M.A.; Farooq, M.; Sabagh, A.E.L.; Kizilgeci, F.
In Bangladesh, maize stands second place after rice; [since it faces diverse natural calamities during its highest growing season (rabi/winter), particularly strong storm during the reproductive stage. Sometimes in some regions, this crop is completely damaged by natural disasters. Considering the burning issue, thirteen hybrids, including 10 previously selected short stature hybrids were evaluated against three local and standard checks: ‘BHM-9’, ‘981’ and ‘Sunshine’ in two consecutive years in seven locations of Bangladesh. Combined analysis over locations and seasons instigated that genotypes ‘Sunshine’, ‘981’ and ‘G10’ were the top-high yielders, while genotypes ‘G1’, ‘G2’, ‘BHM-9’ and ‘Sunshine’ were found the most stable. On the other hand, five genotypes such as ‘G3’, ‘G4’, ‘G6’, ‘G8’ and ‘G9’ had the below-average mean yield and the genotypes ‘G6’ and ‘G9’ were the most unstable. Among the seven environments, Jamalpur, Joydebpur and Dinajpur were most discriminating and Ishwardi was the least discriminating; [whereas Joydebpur was more representative and Borishal was the least representative of other test environments. In the case of plant and ear height, most of the genotypes showed a lower value than all the checks, which was desirable. But among the top three high yielders, local cross-genotype, the ‘G10’ had the lowest and more stable value for both plant height and ear height. Therefore, considering the plant and ear height, grain yield, and yield stability, the genotype ‘G10’ has been recommended for release as commercial variety and has been released as new maize variety in Bangladesh with the local name of ‘BARI Hybrid Maize-16’ (BHM-16). © 2020, Society of Field Crops Science. All rights reserved.
Diallel analysis of salinity tolerance at germination and the early seedling stage in bread wheat (Triticum aestivum L.)
(2021) Kızılgeçi, Ferhat
Salt stress is one of the most crucial abiotic stress factors and affects about 20 % of the world's irrigated land. The present study was conducted to evaluate the combining effects of salinity stress response at the early seedling stage, (root length, coleoptile length, shoot length, germination rate and germination vigour) using four parents and their 4 x 4 full-diallel crosses of bread wheat. Parents and their F2 hybrids were assessed in the laboratory under salinity stress induced by sodium chloride (NaCl) with two treatments (0 control, 100 mMol). General Combining Ability (GCA) mean squares were highly significant for all traits studied. The GCA: SCA (Specific Combining Ability) rate was greater than the unit for all the traits studied and additive genes indicated a higher contribution than non-additive genes in the inheritance of these characters. GCA effects showed that ‘84CZT04’ was the desirable general combiner for coleoptile length, root length and shoot length under salinity stress condition. Estimates of the SCA effects of crosses demonstrated that 1 × 4 and 3 × 1 could be regarded as the most desirable cross-combination for root and shoot length at both conditions.
II. Ürün Soya Çeşitlerinin [Glycine max (L.) Merrill] Farklı Yetişme Dönemlerinde Ölçülen Fizyolojik Parametreleri
(2021) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat; Eliçin, Ahmet Konuralp; Tazebay Asan, Nihan
Farklı olgunlaşma grubunda yer alan 13 soya çeşidinin yer aldığı çalışma, tesadüf blokları deneme desenine göre, üç tekrarlamalı olarak 2019 yılında Şırnak ili İdil ilçesinde yürütülmüştür. Çalışmada çiçeklenme başlangıcında (R1) ve tohum olum döneminde (R5) ölçülen klorofil içeriği (SPAD), yaprak alanı (YA), yaprak alan indeksi (YAİ) ve yaprak büyüme oranı (YBO) özellikleri incelenmiştir. SPAD değeri R1’de 35.35-42.20 ve R5’de 42.33-36.5; YA özelliği R1’de172.33 cm2 -41.66 cm2 , R5’de198.66 cm2 -46 cm2 ; YAI özelliği R1’de 2.46 cm2 /cm2 -1.14 cm2 /cm2 , R5’de 6.75 cm2 /cm2 -3.34 cm2 /cm2 arasında değişim göstermiştir. İncelenen fizyolojik ölçümler arasında YAI (R5) ile YBO arasında (r=0.908) olumlu ve %0.1 düzeyinde ve YA (R1) ile YA (R5) arasında (r = 0.544) olumlu ve %1 düzeyinde önemli ilişki olduğu görülmüştür.
Evaluation of six elite irrigated spring bread wheat (Triticum aestivum L.) varieties tolerant to heat stress during late sowing
(2021) Kızılgeçi, Ferhat; Kızılgeçi, Ferhat; Milon, M S H; Teixeria da Silva, Jaime A; Gaydon, Donald S
To assess the heat stress tolerance of recently released wheat varieties, six of these varieties (Shatabdi, BARI Gom 26, BARI Gom 27, BARI Gom 28, BARI Gom 29 and BARI Gom 30) were evaluated at two sowing conditions (optimum sowing on November 15 and extremely late sowing under heat stress on January 15). All treatments were arranged in a randomized complete block design with a split–plot arrangement and repeated three times. Two sowing dates were arranged in the main plots and six wheat varieties were assigned to sub–plots. The varieties that are suitable to grow under late sowing were recognized based on phenological data such as date of booting, heading, anthesis and physiological maturity, growth data such as plant population, number of tillers m–2, plant height, leaf area index, total biomass at the booting stage and plant height at harvest. Besides phenological and growth data, yield and yield attributes such as spikes m–2, spike length (cm), spikelets spike–1, grains spike–1, 1000–grain weight (g), grain yield (GY, kg ha–1), straw yield (kg ha–1), biological yield (kg ha–1) and harvest index were also recorded. Stress–related parameters such as yield stability index, stress tolerance index, stress intensity and heat susceptibility index were also estimated for final confirmation of heat tolerance of varieties. In optimum sowing conditions, phenology, growth, yield and yield components were significantly higher than in late sowing under heat stress. Among these wheat varieties, significantly (p < 0.01) highest GY was obtained from Shatabdi (5,096 kg ha–1) and lowest from BARI Gom 27 (3,955.33 kg ha–1) when sown under optimum conditions. When sown at late, BARI Gom 30 was found to be heat tolerant and produced maximum GY (1,834.33 kg ha–1), whereas BARI Gom 27 was highly sensitive to heat and produced the lowest GY (1,353 kg ha–1). Under both sowing conditions (optimum and late sowing), significantly maximum GY and biological yield were recorded in variety Shatabdi (3,419 kg ha–1), and the lowest was observed in BARI Gom 27 (2,654 kg ha–1). By evaluating heat tolerance indices, BARI Gom 30, followed by BARI Gom 29, BARI Gom 26 and Shatabdi were found to be tolerant to heat stress, whereas BARI Gom 27 and BARI Gom 28 were susceptible to late–sowing heat stress condition. Therefore, except for BARI Gom 27 and BARI Gom 28, the remaining four varieties (Shatabdi, BARI Gom 26, BARI Gom 29 and BARI Gom 30) are recommended for sown late heat stress condition and could also be used in a future breeding program to develop heat–tolerant varieties

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