排序方式： 共有39条查询结果，搜索用时 250 毫秒
31.
Sabina Asghar Muhammad Kashif Abdus Salam Khan Ihsan Khaliq Jehanzeb Farooq 《Frontiers of Agriculture in China》2011,5(2):141-145
Cultivar mixtures have been suggested as ways to increase crop productivity. This field study was conducted to investigate
the competition among five cultivated varieties of wheat (Triticum aestivum L.) for the traits like plant height, flag leaf area, fertile tillers per plant, spike length, spikelets per spike, spike
density, grain weight per spike, and seed index in relation to competition with yield per plant. It was observed that cultivar
mixtures ought to be more productive than corresponding pure stands. Four binary combinations of Seher2006-Kohistan97, Farid2006-SH2002,
SH2002-Shahkar95, and SH2002-Kohistan97 were superior in performance, showing land equivalent ratio (LER) values greater than
one for plant height, fertile tillers per plant, spike density, grain weight per spike, and grain yield per plant. It was
observed that the performance of binary mixtures was mainly due to the increased average performance in spike density, grain
weight per spike, and grain yield per plant. The competitive ability of wheat varieties in mixtures was independent of each
other for the respective traits, which lead to cumulative effects for the increased performance within the associates in mixtures. 相似文献
32.
Shah Fahad Muhammad Zahid Ihsan Abdul Khaliq Ihsanullah Daur Shah Saud Saleh Alzamanan 《Archives of Agronomy and Soil Science》2018,64(11):1473-1488
The enhancement in both frequency and intensity of high temperature, besides its large variability will result in up to 40% yield reduction in rice by the end of 21st century. Vegetative growth in rice continues with day time temperature up to 40°C but development of florets is extremely sensitive to temperature higher than 35°C. The effect of night time temperature stress is even more adverse than day. Heat stress results in deprived anther dehiscence, impaired pollination and abnormal pollen germination that cause floret sterility. The decrease in pollen viability is presumably caused by imbalance in proteins expression, abandoned biosynthesis, partitioning and translocation of soluble sugars, imbalance in phytohormones release, and loss of pollen water content. Rice responds to heat stress by adjusting various physiochemical mechanisms viz., growth inhibition, leaf senescence and alteration in basic physiological processes. Antioxidant enzymes, calcium and iron also play an important role in managing heat stress. Response of rice to heat stress varies with plant ecotype, growth stage, heat intensity and time of stress application. High temperature stress can be managed by developing heat-tolerant genotypes. Rice breeding and screening may be based on anther dehiscence, pollen tube development and pollen germination on stigma. 相似文献
33.
The growth and nutrition of maize (Zea mays L.) grown with and without the soil application of phosphorus (P) fertilizer and/or mycorrhizal inoculum was studied in pots placed under field environments. Inoculation enhanced the growth of maize significantly (up to 81.8%) during the early stages but response gradually disappeared during the later stages of growth. Addition of phosphate increased plant growth, but suppressed mycorrhizal infection. In the first half of the season, the stimulation in plant growth was related to higher rates of P uptake by the inoculated plants, but later a decline of growth in these treatments was most probably due to fungal parasitism as a result of high root densities. 相似文献
34.
Apurba Kanti Choudhury Abdul Karim Moynul Haque Qazi Abdul Khaliq Jalal Uddin Ahmed Mofazzal Hossain 《Journal of Crop Science and Biotechnology》2011,14(1):17-24
Seven genotypes of French bean (Phaseolus vulgaris L.) were evaluated under semi-controlled conditions at the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh
to analyze genotypic variability in leaf water status under water stress. The plants were grown under two moisture regimes,
viz. 80% field capacity (FC) and 50% FC throughout the growing season. The genotypes showed significant variation in water relation
traits. Genotypes BB24 and BB43 maintained higher relative water content (RWC), but lower turgid weight/dry weight ratio (TW/DW)
and water uptake capacity (WUC). When drought susceptibility index (DSI) among the genotypes was considered, BB24 was found
the most tolerant to drought and BB04 was the most susceptible one. A close positive relationship between leaf TW/DW and DSI
under drought was recorded (R
2 = 0.627). Leaf TW/DW was decreased considerably due to water stress by 10% in genotype BB24 followed by BB43 (13%), and both
BARI bushbean-2 and BB04 (19%). Stomatal aperture and whole plant transpiration rate were found minimal in the BB24 and BB43
compared to that of BB04 and BARI bushbean-2. Considering these water relation traits, genotypes BB24 and BB43 may be considered
as relatively tolerant to tissue dehydration. The study also revealed that the TW/DW, WUC, stomatal aperture, and whole plant
transpiration rate was negatively and significantly associated with yield; however, the RWC was positively correlated with
yield under water stress conditions. 相似文献
35.
The new branched spike form of wheat was synthesized from a cross between a complex wheat line 171ACS {[(T. durum Desf. × Ae. tauschii Coss.) × S. cereale L. ssp. segetale Zhuk.] × T. aestivum L. ‘Chinese Spring’} (2n = 6x = 42, AABBDD) and durum wheat variety T. durum Desf. ‘Bereketli-95’ (2n = 4x = 28, AABB). This branched spike form is distinguished significantly from the other branched spike forms known so far.
Later on basis of these plants have been developed the branched spike lines. This study was aimed to generate the segregating
populations from reciprocal (F1–F3) and backcross (BC1F1–BC1F3) crosses between one of such lines—166-Schakheli (2n = 4x = 28, AABB) and tetraploid wheat species (T. polonicum L., T. turanicum Jakubz., T. durum Desf.) for revealing the inheritance character of this branching trait and study meiotic behavior in reciprocal (F1, F2) and backcross (BC1F1) progenies. Results showed that this trait is controlled by a single recessive gene despite certain irregularity against
Mendelian law in F2 generations and does not depend on gene dosage, i.e., number of chromosomes. 相似文献
36.
Zhixin Lei Qianying Liu Haseeb Khaliq Jiyue Cao Qigai He 《Journal of veterinary pharmacology and therapeutics》2019,42(3):324-335
Florfenicol, a structural analog of thiamphenicol, has broad‐spectrum antibacterial activity against gram‐negative and gram‐positive bacteria. This study was conducted to investigate the epidemiological, pharmacokinetic–pharmacodynamic cutoff, and the optimal scheme of florfenicol against Escherichia coli (E. coli) with PK‐PD integrated model in the target infectious tissue. 220 E. coli strains were selected to detect the susceptibility to florfenicol, and a virulent strain P190, whose minimum inhibitory concentration (MIC) was similar to the MIC50 (8 μg/ml), was analyzed for PD study in LB and ileum fluid. The MIC of P190 in the ileum fluid was 0.25 times lower than LB. The ratios of MBC/MIC were four both in the ileum and LB. The characteristics of time‐killing curves also coincided with the MBC determination. The recommended dosages (30 mg/kg·body weight) were orally administrated in healthy pigs, and both plasma and ileum fluid were collected for PK study. The main pharmacokinetics (PK) parameters including AUC24 hr, AUC0–∞, Tmax, T1/2, Cmax, CLb, and Ke were 49.83, 52.33 μg*h/ml, 1.32, 10.58 hr, 9.12 μg/ml, 0.50 L/hr*kg, 0.24 hr?1 and 134.45, 138.71 μg*hr/ml, 2.05, 13.01 hr, 16.57 μg/ml, 0.18 L/hr*kg, 0.14 hr?1 in the serum and ileum fluid, respectively. The optimum doses for bacteriostatic, bactericidal, and elimination activities were 29.81, 34.88, and 36.52 mg/kg for 50% target and 33.95, 39.79, and 42.55 mg/kg for 90% target, respectively. The final sensitive breakpoint was defined as 16 μg/ml. The current data presented provide the optimal regimens (39.79 mg/kg) and susceptible breakpoint (16 μg/ml) for clinical use, but these predicted data should be validated in the clinical practice. 相似文献
37.
Muhammad Zia-Ul-Haq Abdul Khaliq Sheng QIANG Amar Matloob Saddam Hussain Saba Fatima Zeshan Aslam 《农业科学学报》2019,18(4):907-926
To ascertain the influence of wheat stubble management options and chemical weed control methods on weed growth and productivity of dry direct-seeded fine rice, a two years' field study was undertaken at the Agronomic Research Farm, University of Agriculture, Faisalabad, Pakistan in 2013 and 2014. Different wheat stubble management methods, viz., incorporation, burning and retention were executed during seed-bed preparation. While, herbicide treatments comprised of a weed check, weed free, pendimethalin followed by tank mixture of fenoxaprop p-ethyl+ethoxysulfuron ethyl, and bispyribac sodium followed by tank mixture of fenoxaprop p-ethyl+ethoxysulfuron ethyl. Results revealed that weed control efficacy of both herbicide treatments ranged from 84 to 94%. Herbicide treatments significantly reduced weed density(88–90%) and dry weight(86–88%), while improved the rice growth attributes compared with weed check. Application of bispyribac sodium followed by tank mixture of fenoxaprop p-ethyl+ethoxysulfuron ethyl in stubble retention recorded 226 and 273% increase in kernel yield over weedy check in 2013 and 2014, respectively. In stubble incorporation, pendimethalin followed by tank mixture of fenoxaprop p-ethyl+ethoxysulfuron ethyl was more effective in increasing(256–293%) rice yields over weedy check. Among different treatment combinations, the maximum net benefits(1 397.49~(–1) 472.22 USD ha~(–1)), net returns(636–700 USD ha~(–1)), benefit cost ratio(1.77~(–1).83) and marginal rate of return(2 187–2 330%) were recorded with the application of bispyribac sodium followed by fenoxaprop p-ethyl+ethoxysulfuron ethyl in stubble retention. In crux, application of bispyribac sodium followed by tank mixture of fenoxaprop p-ethyl+ethoxysulfuron ethyl in stubble retention is efficient approach to control weeds, and get maximum rice productivity and net economic returns under dry seeded system. 相似文献
38.
Abdul Khaliq M. Kaleem Abbasi Imtiaz Hussain 《Archives of Agronomy and Soil Science》2018,64(5):640-653
This study provided an insight on improving soil-plant micronutrients availability in response to poultry manure (PM), wheat milling residues (WMR) and urea N (UN) and their integration in wheat–soybean cropping system. The treatments were: control; poultry manure full, PM100; wheat milling residues full, WMR100; urea N full, UN100; PM half and WMR half, PM50+WMR50; UN50+PM50; UN50+WMR50; UN50+PM25+WMR25. All amendments were added at the rate or equivalent to 100 kg total N ha–1. Results indicated that the integrated treatments increased Cu, Fe, Mn and Zn uptake of wheat by 35.7–103%, 48.4–111.1%, 85.2–267.0% and 33.8–128.2%, respectively over control. In soybean the corresponding increase in micronutrient uptake (Cu, Fe, Mn and Zn) was 18.3–60.3%, 27.5–87.4%, 14.1–54.6% and 13.2–58.0% in integrated treatments. The post-harvest soil analysis indicated 2 to 3-fold increase in micronutrient content with highest values in PM100 i.e., 2.66 mg kg?1 for Cu, 14.41 mg kg?1 for Fe, 18.58 mg kg?1 for Mn and 2.44 mg kg?1 for Zn, respectively. The results showed that the PM either alone or in integrated with WMR and UN can be an effective management strategy for improving micronutrient content of soil–plant. 相似文献
39.
Naeem Sarwar Hakoomat Ali Muhammad Maqsood Ashfaq Ahmad Ehsan Ullah Tasneem Khaliq 《Journal of plant nutrition》2014,37(8):1287-1303
Seedling vigor is the basic component of the transplanted rice, which depends on its growing environment and proper age. Thus the influence of nursery management and seedling age was evaluated after transplanting 10, 20, 30, and 40-days older seedlings raised by using seed rate (high and low) and nitrogen (N) (with and without) in rice growing season 2008 and 2009. Study revealed that 10-days older nursery seedlings, irrespective to nursery-bed treatments, showed accelerated growth start after transplanting in main field while at later stages significant interaction was observed. Transplanting of 20-days older fertilized seedlings grown at low seeding density at nursery-bed resulted in similar growth performance as in younger. Maximum net-benefit (45111, 44402 Rs. ha?1) was recorded with transplanting 10-days older nursery seedlings while the fertilized seedlings grown at lower seeding density recorded highest net-benefit (37908, 36780 Rs. ha?1) in both the years. 相似文献