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221.
Suranjit Sarkar Sanmay Kumar Patra 《Communications in Soil Science and Plant Analysis》2017,48(9):1008-1019
The effectiveness of eight chemical extraction methods was evaluated on 15 Indian soils for the prediction of plant-available potassium (K+) to Sudan grass (Sorghum vulgare var. sudanensis) grown in modified Neubauer technique. Average amounts of soil K+ extracted were in descending order: Morgan’s reagent > 0.5 M sodium bicarbonate (NaHCO3) > neutral 1N ammonium acetate (NH4OAc) > 1N nitric acid (HNO3) > 0.02 M calcium chloride (CaCl2) > 0.1N HNO3 > Bray and Kurtz No.1> distilled water. The highest simple correlation with plant K+ uptake was obtained with NH4OAc-K+ (r = 0.866**) and the lowest with CaCl2-K+ (r = 0.45*). To develop the predictive models using stepwise regression, plant K+ uptake was used as the dependent variable and the extractable soil K+, pH, sand, silt and organic carbon (C) contents as the independent variables. Based on the final R2, the NH4OAc model was found to be the best predictor of plant-available K+ in the soils when used along with sand and organic C. 相似文献
222.
Slow-growth conservation of potato microplants: efficacy of ancymidol for long-term storage in vitro
Ancymidol was investigated as an alternative mediumsupplement to mannitol for slow-growth conservation ofpotato microplants in vitro. Differentconcentrations of ancymidol (0, 5, 10, 15, 20, 25, 30,35 and 40 M) were tested in slow-growthmedia based on MS medium supplemented with either 30or 60 gl-1 sucrose. The cultures were conservedunder a 16-h photoperiod at two temperature regimesi.e. 24 ± 1 °C and 6 ± 1 °C. Therewere significant interactions between ancymidol andother factors such as sucrose, temperature andgenotype for microplant survival, microshoot heightand overall microplant growth. Ancymidol did have abeneficial effect on culture viability after prolongedmaintenance in vitro. The growth-inhibitingeffect of ancymidol persisted through a 16-monthculture period. Combined effect of ancymidol, sucroseand temperature showed that optimum culture viabilityand desirable microplant growth were obtained when thecultures were grown in MS medium supplemented with 10M ancymidol plus 60 gl-1 sucrose at6 ± 1 °C. Vitrification and flaccidity, whichare very frequently observed in potato microplantcultures during prolonged maintenance in vitrounder osmotic stress (mannitol), were not observedwhen the microplants were conserved in ancymidolmedia. Genetic stability of potato microplantsconserved in ancymidol media was evaluated usingrandomly amplified polymorphic DNA (RAPD)fingerprints. Ancymidol did not induce any detectablegenetic variation in genomic DNA as visualized by theabsence of either any additional RAPD fragment oralterations in RAPD fragment patterns. 相似文献
223.
M. Sarkar S. Bandyopadhyay G. Krishnan B. S. Prakash 《Tropical animal health and production》2010,42(3):421-424
The changes of glucocorticoid concentrations were measured by highly sensitive enzymeimmunoassay procedures using second antibody
coating technique and cortisol -HRP amplified system for one whole calendar year in yaks. The year was divided into seasons
of cool, intermediate and hot seasons. The glucocorticoid values were lower (P < .01) in hotter months than in cool and intermediate
seasons. Rectal temperature and respiration rates were indicative of heat stress in the hot temperature season and gave significant
negative correlation with circulating corticoid concentration. 相似文献
224.
The extraction and comparison of soil amino acids using different extractants (deionized water, K2SO4, Na2SO4, NaCl, KCl) were reported. Results showed that 0.5 mol L?1 K2SO4 with a 5 times extraction was a better method to assess the concentration of extractable amino acids in soils. The total amino acids extracted from soil planted for tea were similar to the total inorganic nitrogen. While they extracted from vegetable soil and paddy soil were much lower than the total inorganic nitrogen. 相似文献
225.
226.
S. Sarkar M.K. Nanda M. Biswas A. Mukherjee M. Kundu 《Agricultural Water Management》2009,96(10):1475-1482
Frequency and depth of irrigation play crucial role in crop yield and use efficiency of water resource. To test this hypothesis a field study was carried out in November to January of 2001-2002 to 2003-2004 on a sandy loam (Aeric haplaquept) for quantifying the frequency and depth of irrigation on growth, curd yield (CY) and water use pattern of cauliflower (Brassica oleracea L. var. botrytis). Four irrigation frequencies depending on the attainment of cumulative pan evaporation (CPE) values of: 25 (CPE25), 31(CPE31), 38 (CPE38) and 45 (CPE45) mm were placed in main-plots, with three depth of irrigation (IW) of 35 (IW35), 30 (IW30) and 25 (IW25) mm in sub-plots. Water use efficiency (WUE), net evapotranspiration efficiency (WUEET) and irrigation water use efficiency (WUEI) were computed. Marginal water use efficiency (MWUE) and elasticity of water productivity (EWP) were calculated using the relationship between CY and seasonal actual evapotranspiration (SET). A continuous increasing trend in growth parameters, yield and WUEI was recorded with the increase in SET from CPE45-IW25 to CPE31-IW30. However with further increase in SET the same decreased up to CPE25-IW35 regime. Highest WUE and WUEET obtained under CPE38-IW35 regime where SET value was 5% lower than the status of SET under CPE31-IW30. This study confirmed that critical levels of SET needed to obtain maximum curd yield or WUE, could be obtained more precisely from the knowledge of MWUE and EWP. 相似文献
227.
Epilachna dodecastigma (Wied.) (Coleoptera: Coccinellidae) causes economic losses to bitter gourd, Momordica charantia L. (Cucurbitaceae) production in India and Bangladesh because adults feed on the leaves and flowers resulting death of the plant. This insect is currently controlled by insecticides, which are harmful to human health and environment. We studied the behavioral responses of E. dodecastigma females to floral volatiles and synthetic compounds comparable to floral volatiles in a Y-tube olfactometer to determine their potential for monitoring this pest. The gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detector (GC-FID) analyses of M. charantia floral volatiles revealed the presence of 20 compounds. Myrcene was predominant followed by methyl jasmonate and 1-octadecanol in floral volatiles. Epilachna dodecastigma females were attracted to floral volatiles by a Y-tube olfactometer bioassay. Females were attracted to individual synthetic 1-heptanol, sabinene, myrcene and ocimene at 16, 1, 20, and 8 µg/25 mL methylene chloride in a dose response bioassay, respectively, and hence, these compounds might be used for insect pest management strategies such as baited traps. 相似文献
228.
S. Gulia M. Sarkar Vijay Kumar H. H. D. Meyer B. S. Prakash 《Tropical animal health and production》2010,42(6):1143-1148
Delayed pubertal development and low fertility of Bos indicus x Bos taurus crossbred male cattle and domestic buffaloes is hardly understood hence, a sensitive enzymeimmunoassay (EIA) was developed
using the second antibody-coating technique and testosterone-3-O-carboxymethyloxime-horseradish peroxidase conjugate as a
label for determination of testosterone in blood plasma. The EIA was validated by standard criteria. Blood samples were collected
by venipuncture from growing male cattle (Karan Fries and Sahiwal) and buffalo (Murrah) and testosterone was estimated using
the EIA procedure. Plasma testosterone concentrations increased significantly (P < 0.05) with advancing age. Testosterone concentrations were significantly (P < 0.01) higher in Sahiwal males in comparison to Karan Fries males. The low testosterone levels in crossbred than Sahiwal
could imply that crossbred males have either not stabilized genetically or not adapted well in Indian climatic conditions
resulting in poor libido and poor semen quality. The low testosterone levels in Murrah buffalo males may be the possible reason
for delayed maturity in this species. The direct, sensitive EIA validated for estimating the plasma testosterone concentration
was reliable for studying the testosterone profile in blood plasma of males. The results suggest that there could be a requirement
for higher testosterone secretion by males during early stages of growth for attaining early sexual maturity. 相似文献
229.
Abhinanda Bairagi Keka Sarkar Ghosh Sukanta Kumar Sen Arun Kumar Ray 《Aquaculture International》2002,10(2):109-121
Isolationand enumeration of aerobic bacterial flora in the gastrointestinal tract of nineculturable freshwater teleosts, namely catla, rohu, mrigal, silver carp, grasscarp, common carp, tilapia, walking catfish and murrel have been carried out.Amylolytic, cellulolytic, lipolytic and proteolytic microflora were identifiedfrom the culture plate using selective media. The isolates were qualitativelyscreened on the basis of their extracellular enzyme producing ability. Theselected strains were further quantitatively assayed for amylase, cellulase,lipase and protease activities. Protease activity was exhibited by almost allthe bacterial isolates, while strains isolated from tilapia, grass carp andcommon carp showed considerable amylolytic and cellulolytic activities. Maximumactivity of lipase was exhibited by a strain isolated from silver carp. Thestudy indicates that there is a distinct microbial source of the digestiveenzymes – amylase, cellulase, lipase and protease, apart from endogenoussources in fish gut. The information generated from the present investigationmight contribute towards better feed formulations for carp at low cost,incorporating the enzyme producing bacterial isolates as probiotics. 相似文献
230.
Es konnten 132Bacillus-Stämme isoliert und gegenüber7 Rhizoctonia-solani- und 6Pythium-Stämmen auf Antagonismusin vitro untersucht werden. Die gefundenen Antagonisten hemmten die Pilzisolate unterschiedlich stark, so daß Gemische von Antagonisten für die Praxis zu empfehlen sind.There were 132Bacillus-strains isolated and tested for antagonism against 7 strains ofRhizoctonia solani and 6 strains ofPythium spp. The isolated antagonists didn't show a uniform effect against the tested strains ofRhizoctonia solani andPythium spp. For an application in practice it will be better to use a mixture of antagonists.
Mit 4 Abbildungen und einer Tabelle 相似文献
Mit 4 Abbildungen und einer Tabelle 相似文献