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A 2-year field experiment using a randomized complete block design with the treatments arranged as split-split-plot with three replicates was conducted to investigate the effects of different sowing dates. Different irrigation regimes and different triticale cultivars were tested during 2014 and 2015 growing seasons. Under cutting off irrigation at the milk development stage, Sanabad with 46.2% had higher relative water content on December 3 sowing date. Assimilate remobilization in cutting off irrigation at dough development was more than that at milk development and Sanabad had the highest assimilate remobilization on 3 December sowing date in both years. In both years, Sanabad had the highest remobilization efficiency. The highest contribution of pre-anthesis assimilates to grain was obtained on 3 December sowing date in both years in Sanabad. Lower grain yield in Juanillo cultivar under cutting off irrigation, appeared to be due to reduction in remobilization efficiency, especially by cutting off irrigation at milk development stage in late sowing date. Overall, Sanabad was more tolerant to cutting off irrigation than Juanillo. 相似文献
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Roghayeh Shahriaripour Ahmad Tajabadipour Isa Esfandiarpoor Vahid Mozafary 《Journal of plant nutrition》2019,42(11-12):1277-1282
Developing a fast and reliable soil testing method is critical for improving soil testing efficiency and ensuring reliable fertilizer recommendation. The objectives of this study were to evaluate sodium ethylene diamine tetra acetic acid (Na2-EDTA) as a replacement for ammonium bicarbonate-diethylenetriaminepentaacetic acid (AB-DTPA) to extract phosphorus (P) to determinate the relationships between extractable P and its uptake by crop in calcareous soils. Na2-EDTA and AB-DTPA was compared by the amounts of extracted P by analyzing soil samples collected from agricultural production areas. There were significant correlations between Na2-EDTA and AB-DTPA for soil test P based on soils collected from the agricultural field. Soil test P by both extractants was significantly correlated with plant P concentration. Na2-EDTA was identified as an alternate improved extraction method instead of AB-DTPA in calcareous soils based on this study. However, more work will be needed to identify the correlation of the two extractants and crop responses under a field condition. 相似文献
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Vahid Nasiri Ali.A.Darvishsefat Reza Rafiee Anoushirvan Shirvany Mohammad Avatefi Hemat 《林业研究》2019,(3):943-957
Temporal land use/land cover (LULC) change information provides a variety of applications for informed management of land resources. The aim of this study was to detect and predict LULC changes in the Arasbaran region using an integrated Multi-Layer Perceptron Neural Network and Markov Chain analysis. At the first step, multi-temporal Landsat images (1990, 2002 and 2014) were processed using ancillary data and were classified into seven LULC categories of high density forest, low-density forest, agriculture, grassland, barren land, water and urban area. Next, LULC changes were detected for three time profiles, 1990–2002, 2002–2014 and 1990–2014. A 2014 LULC map of the study area was further simulated (for model performance evaluation) applying 1990 and 2002 map layers. In addition, a collection of spatial variables was also used for modeling LULC change processes as driving forces. The actual and simulated 2014 LULC change maps were cross-tabulated and compared to ensure model simulation success and the results indicated an overall accuracy and kappa coefficient of 97.79% and 0.992, respectively. Having the model properly validated, LULC change was predicted up to the year 2025. The results demonstrated that 992 and 1592 ha of high and lowdensity forests were degraded during 1990–2014,respectively, while 422 ha were added to the extent of residential areas with a growth rate of 17.58 ha per year. The developed model predicted a considerable degradation trend for the forest categories through 2025, accounting for 489 and 531 ha of loss for high and low-density forests, respectively. By way of contrast, residential area and farmland categories will increase up to 211 and 427 ha, respectively. The integrated prediction model and customary area data can be used for practical management efforts by simulating vegetation dynamics and future LULC change trajectories. 相似文献
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K. Sorkheh B. Shiran V. Rouhi E. Asadi H. Jahanbazi H. Moradi T. M. Gradziel P. Martínez-Gómez 《Genetic Resources and Crop Evolution》2009,56(7):947-961
A total of 137 accessions from 18 wild almond species were collected from Iran and leaf and fruit traits were characterized.
Also evaluated were flowering and ripening date, self-incompatibility and kernel bitterness. An extensive phenotypic diversity
was found both among and within species. Differences in average leaf dimensions among and within species were associated with
average rainfall but not altitude of collection site. Adjacent accessions located in drier areas had smaller leaf dimensions
than those located in semi-humid or humid regions. No relation was found between average fruit dimensions and collection site
conditions. Principal component analysis revealed that the nut weight and width, and the kernel weight had highest loading
in the first component accounting for 45.8% of total variation. In contrast, leaf traits in the second component accounted
for 22.3% of total variation. No significant correlations were detected between leaf dimensions and fruit traits in all species
evaluated. Results document a rich source of new germplasm for almond improvement programs. Small fruit size, pollen-pistil
self-incompatibility, and bitter kernel flavour are the most common obstacles to the utilization of this wild germplasm in
breeding. 相似文献
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The accuracy of the knowledge of mass transfer parameters(effective moisture diffusivity,mass transfer Biot number and mass transfer coefficient) in the case of frying food,is essential and important for designing,modeling and process optimization.This study is undertaken to develop an approach for determining mass transfer parameters during frying of spherical rice cracker in sunflower oil at 150,170 and 190 ℃.These parameters were evaluated from the plots of dimensionless concentration ratios against time of frying.Effective moisture diffusivity,mass transfer Biot number and mass transfer coefficient ranged between 1.24×10-8 to 2.36×10-8 m2/s,1.96 to 2.34 and 5.51×10-6 to 9.70×10-6 m/s,respectively.Effective moisture diffusivity and mass transfer coefficient were found to increase with an increasing frying temperature,whereas mass transfer Biot number decreased.An Arrhenius-type relationship was found between effective diffusivity coefficient and frying temperature. 相似文献
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Vahid Tavallali 《Journal of plant nutrition》2017,40(11):1588-1603
The effects of zinc (Zn) and boron (B) on some physiological and biochemical characteristics of pistachio (Pistacia vera L. cv. Badami) seedlings were evaluated in a greenhouse study. It was found that both high levels (10 and 20 mg B kg?1 soil) and also lack of B account for the reduction in growth and photosynthesis parameters, especially at low Zn levels. Moreover, Zn deficiency resulted in a reduction in the net photosynthetic rate and stomatal conductance. However, the adverse effects of B deficiency and toxicity were alleviated by increasing Zn levels up to 10 mg kg?1 soil. In addition, provided that B and Zn are adequate, synergism can be observed between the two nutrients. This is because sufficient amounts B accelerated the effects of Zn by raising the plant dry weight, photosynthesis parameters, carbonic anhydrase activity, and chlorophyll contents. This increase was reported higher in comparison with Zn alone application. It was concluded that Zn may act as a scavenger of reactive oxygen species (ROS) for mitigating the injury on biomembranes under B stress. Adequate concentration of Zn also prevents uptake and accumulation of excess B in leaf by increasing membrane integrity of root cells. Similarly, B application in adequate concentration plays an important structural role in the cell wall and influences a great variety of physiological processes in pistachio seedlings. 相似文献
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Effects of short-term oral administration of propranolol on tear secretion in clinically normal dogs
Ghaffari MS Arzani V Khorami N Rajaei SM 《The Canadian veterinary journal. La revue veterinaire canadienne》2011,52(8):875-877
This study evaluated the effects of short-term oral administration of propranolol on tear secretion in 15 clinically normal crossbreed dogs. The treatment group (n = 8) received propranolol (2 mg/kg q8h) orally for 7 days. The control group (n = 7) received placebo during the study. Schirmer I tear tests were performed on both eyes 1 d prior to drug administration (T(0)), at 1 (T(1)), 3 (T(3)), and 7 (T(7)) days of treatment. Tear production in dogs, measured by STT, was not significantly reduced in both groups. 相似文献