排序方式： 共有58条查询结果，搜索用时 15 毫秒
31.
U. A. Naher M. I. U. Sarkar A. Jahan J. C. Biswas 《Communications in Soil Science and Plant Analysis》2018,49(6):751-762
Co-composting of urban wastes (UWs) and plant residues with rock phosphate (RP) produces quality compost and reduces the use of chemical phosphorus fertilizer. Biochemical process of three compost piles (P): P1- 50% UW + 30% rice straw (RS) + 10% sawdust (SD) + 8% RP + 2% sugarcane trash (ST), P2- 50% UW + 23% RS + 10% SD + 15% mustard oil cake + 2% ST, and P3- 95% UW + 5% RP was studied. Decomposition rate followed first-order kinetics and maximum (77%) was in P3. The highest bacterial population was found in P2 having higher cumulative CO2 evolution (53.76 mg CO2 g?1 volume solid). Prevalence of phosphate-solubilizing bacteria was 2.0 to 6.3 Log10 Cfu g?1 dry weight and concentrated in RP-amended piles. Humic acid of compost was classified as rotteprudukte. Final pH (7.5 to 8.0) and germination index (>90) proved that the compost was mature. P3 compost (1 t ha?1, fresh weight) had potential to supply 25 kg phosphorus. 相似文献
32.
Ayaz Mehmood Arshad Hussain Bilal Beig Zaib Jahan Nida Zafar 《Journal of plant nutrition》2019,42(10):1218-1229
To address nitrogen (N)-related environmental pollution, development of an economical, slow-release urea fertilizer is the need of the hour. A study was conducted on the reduction of nitrogen released from granular urea fertilizer by applying sulfur, gypsum, bentonite, and starch as coating material. Paraffin wax was used as a binder. The dissolution rates were studied by changing the composition of coating mixture using high-performance liquid chromatography. SEM was used to study the morphology of coated urea in terms of smoothness and uniformity. The ultraviolet spectroscopy analysis further authenticated the release behavior of coated urea in terms of nitrogen concentration. Coating material reduced the release rate of nitrogen from urea fertilizer, significantly. Mixture of sulfur and gypsum coating on urea gave slowest release rate of nitrogen from urea fertilizer, i.e., 37%, as compared to uncoated urea and thus seems to be the most promising binding material for product development. 相似文献
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Munmun Pervin Imam Hasan Md. Alamgir Kobir Latifa Akter Mohammad Rabiul Karim 《Anatomia, histologia, embryologia》2021,50(4):736-745
The liver consists of parenchymal hepatocytes and non-parenchymal cells. Non-parenchymal cells, Kupffer cells, hepatic stellate cells and cholangiocytes have crucial roles in liver homeostasis and liver pathology. To establish baseline data, this study investigated immunohistochemically the distribution of non-parenchymal cells in perivenular areas (PV), periportal areas (PP) and Glisson's sheath (GS) of adult rat liver. Liver tissues were collected from the left lateral lobe of rats. CD163-positive macrophages were seen along the sinusoid of PV and PP areas, indicating Kupffer cells. Double immunofluorescence showed, Kupffer cells partly co-expressed CD68 and MHC class II antigens in the liver. The numbers of Kupffer cells were significantly high in PP areas as compared with PV or GS areas. CD68-positive exudative macrophages were highly localized in PP and GS areas and a comparatively low PV area. MHC class II-positive dendritic cells (activated macrophages) were localized mainly in GS. Granzyme B-positive NK cells were mainly localized in the Glisson's sheath. CD3-positive T cells and CD20-positive B cells were distributed along the sinusoids of the PP and PV areas of hepatic lobules. Vimentin and glial fibrillary acidic protein (GFAP)-positive hepatic stellate cells were localized along sinusoids in the hepatic lobules of the liver. Cholangiocytes reacting to cytokeratin 19 were seen on interlobular bile ducts in Glisson's sheath of the liver. This study shows that heterogeneous macrophage populations, liver-resident lymphocytes and hepatic stellate cells localized in PP and PV areas or GS areas of the liver with cells specific patterns. 相似文献
34.
AbstractSeveral groups of microorganisms are involved in converting applied urea into plant-available nitrate nitrogen (N) in soil. The objective of this study was to evaluate efficacy of humic substrates (HS) for maximizing crop yield by enhancing N availability in soil. In this experiment, HS was applied in soil of tea garden in such a way that active substrate was applied at 0, 400, 800, 1,200, 1,600, and 2,000?g ha?1 in six treatments. Chemical fertilizers were applied in all the treatments (including control) following the recommended doses. This study indicated that applied HS enhanced tea shoot yield and N uptake by tea bushes. Improved biochemical and microbiological properties increased N availability in HS-treated soil and that in turn facilitated N uptake by tea bushes. It was determined that HS substrate application at 1.2?kg ha?1 could enhance the yield of tea shoots up to 18% higher than control treatment. 相似文献
35.
Sung Phil Mun M. Sarwar Jahan A. Al-Maruf D. A. Nasima Chowdhury 《Wood Science and Technology》2011,45(2):281-288
Lack of data especially pertaining to the chemistry of mangrove wood species makes it difficult to prepare successful plans
for their conservation and to use mangroves as a source of wood fiber. In this paper, chemical characterizations of the six
main mangrove species of Bangladesh [namely Keora (Sonneratia apetala), Geoa (Excoecaria agallocha), Bine (Avicennia alba), Sundari (Heritiera fomes) Pashur (Xyloccarpous mekongests), and Kakra (Bruguiera gymnorhiza)] were investigated. The chemical results revealed that these species contain high percentages of dichloromethane followed
by methanol extractives. Methanol extracts in Pashur, Sundari, and Bine were higher than 10%, which indicates high percentage
of tannin material. The total lignin content in these species was higher than 25%, except for Gewa (23.6%) and Pashur (21.3%),
which is higher than that of the normal range of hardwood. The pentosan content in these six species was within the range
of 19.4–22.8%. The α-cellulose content in Keora and Gewa was acceptable for pulp production, but the others were lower than
the normal range of hardwood. Alkaline nitrobenzene oxidation showed that all these species had a very high syringaldehyde
to vanillin (2.6–5.0) ratio except Keora (1.6). Surprisingly, rhamnose is the main constituent with xylose of hemicelluloses
of these six mangrove species. The ash content in these six mangrove wood species was also higher than that in normal hardwood. 相似文献
36.
Plant disease resistance and susceptibility are greatly influenced by the availability of micronutrients, particularly manganese (Mn) and zinc (Zn). Take-all disease of wheat, caused by a strong Mn oxidizing fungus (Gaeumannomyces graminis var tritici, Ggt), results in a lack of availability of Mn to plants and increases disease severity in wheat. Three commercial Trichoderma harzianum (Vitalin T-50, BioHealth®-WSG, and BioHealth®-G) and one Bacillus subtilis (Vitalin SP-11) were investigated individually and in combination (Vitalin T-50 and Vitalin SP-11) for growth promotion and Mn/Zn uptake of take-all infected wheat in a rhizobox experiment under greenhouse conditions. Inoculation with Trichoderma and Bacillus biofertilizers did not increase the shoot dry weight and shoot to root ratio, whilst shoot length was significantly increased with Vitalin T-50 and Biohealth-G treatments in the final harvest. Biofertilizers inoculation that significantly (P < 0.05) enhanced root surface area and root dry weight were Vitalin T-50, BioHelath-G and combination of Vitalin (T-50 + SP-11). The bulk soil pH was not influenced by biofertilizer inoculation, whereas rhizosphere and rhizoplane soil pH were significantly reduced (0.3 – 0.4 pH scale) in Vitalin (T-50 + SP-11) and BioHealth-G treatments and to a lesser extent by Vitalin T-50 inoculation. Manganese uptake in shoots of wheat exhibited no significant differences among the biofertilizer treatments. On the contrary, Zn uptake was significantly higher in Vitalin T-50, Vitalin (T-50 + SP-11), BioHealth-G, and BioHealth-WSG (47, 64, 44, and 45%, respectively) inoculated plants. Therefore, Vitalin T-50 and Biohealth-G showed better performance in improving plant growth and Zn uptake. 相似文献
37.
Jesmin Akter Md. Zahorul Islam Kensaku Takara Md. Amzad Hossain Shinichi Gima De‐Xing Hou 《Weed Biology and Management》2018,18(3):136-145
Turmeric (Curcuma spp.) has numerous biological activities, including anticancer, antibacterial, antifungal and insecticidal properties. Here, we evaluated the plant growth‐inhibitory activities of two cultivars of Curcuma longa (C. longa ; Ryudai gold and Okinawa ukon) against radish, cress, lettuce and Bidens pilosa (B. pilosa ). The methanol extracts of both turmeric varieties inhibited the seed germination and seedling growth of all the tested plants. Ryudai gold had a significantly higher inhibitory effect on the seed germination and root and shoot growth of the plants than Okinawa ukon. Therefore, Ryudai gold was chosen for the isolation of plant growth‐inhibitory compounds using a silica gel column and high‐performance liquid chromatography. The structural identification of the compounds was carried out using 1H NMR, 13C NMR and liquid chromatography–tandem mass spectrometry. The growth inhibitors were identified as four curcuminoids; dihydrobisdemethoxycurcumin ( 1 ), bisdemethoxycurcumin ( 2 ), demethoxycurcumin ( 3 ) and curcumin ( 4 ). The IC50 of the curcuminoids against the root and shoot growth of B. pilosa ranged from 8.7 ± 1.7 to 12.9 ± 1.8 and from 15.5 ± 1.8 to 38.9 ± 2.8 μmol L?1, respectively. Compound 1 showed the lowest IC50 against the root and shoot growth of B. pilosa . These results suggested that Ryudai gold has a potential growth‐inhibitory effect against B. pilosa . 相似文献
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39.
Prabhat Pramanik Shamina Safique Asrafa Jahan Rajib M. Bhagat 《Journal of plant nutrition》2017,40(20):2841-2849
Tea (Camellia sinensis L.) is an evergreen perennial crop, which is cultivated for its shoots in acidic soil under sub-tropical humid climatic condition. The availability of phosphorus (P) to plants is naturally limited in acidic tea-growing soils. Humic substrates (HS) are often applied to enhance availability of nutrients, especially P in horticultural and vegetable crop fields. However, its effect on soil of a perennial crop like tea was not studied before. In this study, application of HS enhanced P availability mainly by facilitating growth of phosphate-solubilizing bacteria (PSB) and enhancing phosphatase activity in soil. Application of same amount of HS in diluted form was more effective to enhance PSB population and phosphatase activity, which in turn increased P availability in soil and P uptake by tea bushes. This experiment indicated that application of 1.5 kg HS ha?1 as 0.3% solution might be applied to enhance P availability to improve P availability and P uptake by plants in tea-growing soil. 相似文献
40.
This study focuses on reducing total phosphorus loading (T-P) from carp culture through improved feed formulation. Since phosphorus (P) contained in fish meal (FM) mainly in the form of tricalcium phosphate is not available to carp, which lack a stomach, the reduction of FM from their diets is effective for lowering T-P. Thus in this experiment, six diets (crude protein < 35%, digestible energy > 3.5 kcal g−1) were designed by substituting FM (10%−25%) with alternate protein ingredients such as poultry feather meal (PFM; 5%−10%), blood meal (BM; 5%−7%) and defatted soybean meal (dSBM; 4%−9%). All diets followed the Kasumigaura ‘Feed Standard’. The total dietary P was 1.0%−1.4% and water extractable P available to carp was 0.66%−0.71%, the levels meeting the dietary requirement of carp. A feeding trial was conducted with juvenile carp (4.6 ± 0.7 g) for 12 weeks at a mean water temperature of 23.7°C. The T-P loading from fish fed the different diets was estimated based on absorption and retention of dietary P. Growth performance corresponded to increasing levels of FM inclusion, being highest in the fish fed 25% FM diet; however, the decrease in T-P was achieved at the lower FM levels. The T-P (based on P retention) ranged from 8.9 to 11.7 kg t−1 production, much lower than that from the commercial diets (9.1–26.4 kg t−1 production). These results indicated that the reduction of FM levels in carp diets to 15%−20% through the combined use of PFM, BM and dSBM effectively lowered T-P. Moreover, the formulated diets were also found to be better than commercial diets in lowering the N loading from carp culture. 相似文献