مقالههای M.M. Akhter
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
۱Evaluation of growth, yield, relative performance and heat susceptibility of eight wheat (Triticum aestivum L.) genotypes grown under heat stress
نویسنده(ها): Akbar Hossain، M.A.Z. Sarker، M. Saifuzzaman، J.A. Teixeira da Silva، M.V. Lozovskaya، M.M. Akhter
اطلاعات انتشار: International Journal of Plant Production، هفتم،شماره۳(پياپي ۲۵)، Jul ۲۰۱۳، سال ۰
تعداد صفحات: ۴۳
Eight spring wheat cultivars were evaluated under three heat stress conditions (early, late and very late) in order to identify suitable cultivars to develop heattolerant genotypes resistant to future global warming. Results from the study indicate that stress did not negatively affect flag leaf area in ‘Prodip’ and ‘Sufi’, flag leaf dry matter partitioning in ‘Prodip’, ‘BARI Gom–26’ and ‘Shatabdi’, above–ground dry matter partitioning in ‘Shatabdi’ and ‘BARI Gom–26’, seedling emergence in ‘Sufi’ and ‘BARI Gom–26’, or tiller production in ‘Sufi’ and ‘BARI Gom–26’. With respect to lower yield reduction, relative performance and heat susceptibility index (HSI), ‘Sufi’ was highly heat stress–tolerant, followed by ‘BARI Gom–26’ and ‘Shatabdi’. On the basis of HSI values in early heat stress and extremely late heat stress (corresponding to early and extremely late sowing), ‘BARI Gom–26’ (HSI=0.10, 0.65) and ‘Shatabdi’ (0.22, 0.62) were highly tolerant to early heat stress and moderately tolerant to extremely late heat stress while ‘Sufi’ was highly tolerant (0.35) to extremely late heat stress and moderately tolerant (0.51) to early heat stress. All other genotypes were susceptible to heat stress, among which ‘Gourab’ (2.19, 1.46) was the most susceptible followed by ‘Sourav’ (1.19, 1.42), ‘Prodip’ (1.03, 1.23), ‘BARIGom–25’ (1.61, 0.89) and ‘Bijoy’ (1.04, 1.28). Thus, ‘BARIGom ’, ‘Shatabdi’ and ‘Sufi’ have the greatest potential to be used as high–yielding wheat genotypes under warm to hot environments and could be used in a breeding programme to develop heat–tolerant wheat.
اطلاعات انتشار: International Journal of Plant Production، دهم،شماره۳(پياپي ۳۷)، Jul ۲۰۱۶، سال ۰
تعداد صفحات: ۱۴
Nitrogen (N) in plants is generally diagnosed by a soil test and plant tissue analysis. However, such analyses are costly in terms of time and money and are not easily accessible by researchers and extension workers, let alone farmers. Alternative cost–effective methods are required for rapid analysis of the N status of crops and to guide N management in wheat. The objective of this study was to assess whether the SPAD values using a leaf chlorophyll meter could be used to apply N at the maximum tillering (MT) stage of irrigated spring wheat grown under light soils of South Asia. Experiments were conducted over two years under light soils at the Wheat Research Centre (WRC), Dinajpur, Bangladesh. Treatments were 80, 100 and 120 kg N ha−1, applied two–thirds as basal and one–third at the crown root initiation (CRI) stage along with additional 10, 20 and 30 kg N ha−1 (first year) and 0, 10, 20 and 30 kg N ha– (second year) at MT. Rates at MT were determined on the basis of SPAD values, which fell below the critical value of 37.5, recorded at 45 days after sowing (DAS). SPAD values recorded at 55 and 65 DAS were positively correlated with grain yield (GY), indicating that the application of extra N at MT influences wheat GY. Our results have two major implications: (i) SPAD values based on a leaf chlorophyll meter can be used for N application and (ii) extra 30 kg N ha–1 at MT is recommended for achieving maximum GY of irrigated spring wheat under the light soils of South Asia.
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