Modelling the Vertical Variability of the Radiation Flux Density in a Closed Green Crop Stand     

S. Prasad 《Journal of Agronomy and Crop Science》1987,159(4):221-225

As the incident radiation penetrates vertically in any plant stand having green closed canopy, the PAR flux density (Rn) gradually decreases with depth in a manner that the radiation flux density (Rn) is inversely proportional to the photosynthetic-area percentage (Pap), and the radiation interception density (Rid). The radiation interception density (Rid) is a function of net radiation intercepted, total photosynthetic-area percentage and the thickness of that photosynthetic-area.  相似文献   

ISOLATION AND CHARACTERISATION OF HERPES VIRUS FROM TURKEYS     

L. B. M. Prasad  P. B. Spradbrow 《Australian veterinary journal》1977,53(12):582-585

Turkey herpesvirus (HVT) was isolated from the kidneys of 6 of 8 turkey poults from two flocks. The isolates were identified by syncytial-type of cytopathology, inhibition of plaque formation by 5-bromodeoxyuridine, formation of Cowdry type A intranuclear inclusions in cell cultures, and presence of herpes-type virions in negatively stained preparations and thin sections of infected cell cultures. One of these isolates inoculated into chickens proved apathogenic over an observation period of 10 weeks. Indirect immunofluorescence and serum neutralisation tests revealed serological relationship between these isolates and the strain NSW 1/70 of HVT. Staining of HVT-infected cell culture by Marek's disease herpesvirus (MDHV) antiserum showed intranuclear fluorescence but attempts to prepare HVT precipitating antigen or to demonstrate cross-precipiation between HVT and MDHV were unsuccessful.  相似文献   

DNA barcoding of important fruit tree species of agronomic interest in the genus Garcinia L. from the Western Ghats     

Anerao  Jayesh  Jha  Vikas  Shaikh  Nishaat  Shivalkar  Apurva  Nityanand  Aishwarya  Sawant  Dishanand  Rao  G. Ramachandra  Mangaonkar  Kiran  Deodhar  Manjushri  Desai  Nitin 《Genetic Resources and Crop Evolution》2021,68(8):3161-3177

Genetic Resources and Crop Evolution - Garcinia L. is a pantropically distributed genus with high species richness in South East Asia. It is a tropical evergreen plant with distinct morphological...  相似文献   

“Kalpa 1” a new late colour development apple (Malus domestica Borkh.) bud sport originated from cv. Starking Delicious     

Prasad  Heerendra  Kumar  K.  Thakur  Dinesh Singh 《Genetic Resources and Crop Evolution》2021,68(6):2273-2279

Genetic Resources and Crop Evolution - Breeding in perennial fruit crops is time consuming process with relatively low success rate as compared with annual crops. Apple fruit coloration is...  相似文献   

A Cretaceous hoofed mammal from India     

Prasad GV  Verma O  Sahni A  Parmar V  Khosla A 《Science (New York, N.Y.)》2007,318(5852):937

The sedimentary record documenting the northward drift of India (Late Cretaceous to late Early Eocene) has recently provided important clues to the evolution, radiation, and dispersal of mammals. Here, we report a definitive Late Cretaceous (Maastrichtian) archaic ungulate (Kharmerungulatum vanvaleni genus et species nova) from the Deccan volcano-sedimentary sequences exposed near Kisalpuri village in Central India. This find has important implications for the origin and diversification of early ungulates and raises three possible paleobiogeographic scenarios: (i) Archaic ungulates may have been cosmopolitan in distribution. (ii) Kharmerungulatum might be an immigrant from Western Asia. (iii) Archaic ungulates may have originated in India.  相似文献   

Influence of competition,irrigation levels and nitrogen fertilization on protein content and protein yield of three spring wheat (Triticum aestivum L.) cultivars     

B. R. Rajeswara Rao  Rajendra Prasad 《Plant foods for human nutrition (Dordrecht, Netherlands)》1987,37(2):127-131

Protein content and protein yield of three spring wheat cultivars differing in morphological and physiological growth characters were found to be influenced by intercultivar competition, irrigation levels and nitrogen fertilization. The protein content of the tall cultivar C 306 and the protein yield of the dwarf cultivar HD 2160 were more than the other cultivars. Binary mixed stands were not superior to the better component cultivar. Intercultivar competition increased the protein content of dwarf and semi-dwarf cultivars, but decreased the protein content of tall cultivar. On the other hand, protein yield of the dwarf cultivar decreased and that of tall cultivar increased when grown in mixed stands. Protein yield of semi-dwarf cultivar increased when grown with dwarf cultivar, but decreased when grown with tall cultivar. Two or three irrigations increased the protein content and protein yield of all the three cultivars and their mixed stands over one irrigation. Protein content and protein yield of the cultivars and their mixed stands were higher when 150 kg N/ha was applied than when 80 kg N/ha was applied.  相似文献   

As(III) removal from aqueous solution by adsorption     

D. B. Singh  G. Prasad  D. C. Rupainwar  V. N. Singh 《Water, air, and soil pollution》1988,42(3-4):373-386

The removal of As(III) from aqueous solutions at different concentrations, pH and temperatures by haematite has been carried out successfully. The maximum removal was found to be 96 % at concentration 13.34 μmol L^?1, temperature 20 °C and pH 7.0. The process of uptake follows first-order adsorption rate expression and obeys the Langmuir's model of adsorption. The removal of As(III) by haematite is also partially diffusion controlled and mass transfer coefficients, diffusion coefficients and thermodynamic parameters have been determined to explain the results.  相似文献   

A Photosynthesis-Based Dry Deposition Modeling Approach     

Niyogi  Dev Dutta S.  Alapaty  Kiran  Raman  Sethu 《Water, air, and soil pollution》2003,144(1-4):171-194

We present a dry deposition modeling approach that includesvegetation-atmosphere interactions through photosynthesis/carbonassimilation relationships. Gas deposition velocity (V _d) is calculated using an electrical resistance-analogapproach in a coupled soil-vegetation-atmosphere transfer (SVAT)model. For this, a photosynthesis-based surface evapotranspirationand gas exchange model is dynamically coupled to an atmospheric model with prognostic soil hydrology andsurface energy balance. The effective surface resistance(composed of aerodynamic, boundary layer, and canopy-basedresistances) is calculated for a realistic and fully interactiveestimation of gaseous deposition velocity over natural surfaces.Based on this coupled framework, the photosynthesis-based gasdeposition approach is evaluated using observed depositionvelocity estimates for ozone over a soybean field (C3photosynthesis pathway) and a corn field (C4 photosynthesispathway). Overall, observed V _d and modeled V _d show good qualitative and quantitative agreement.Results suggest that photosynthesis-based physiologicalapproaches can be adopted to efficiently develop depositionvelocity estimates over natural surfaces. Such a physiologicalapproach can also be used for generalizing results from fieldmeasurements and for investigating the controlling relationshipsamong various atmospheric and surface variables in estimatingdeposition velocity.  相似文献   

Landraces-potential treasure for sustainable wheat improvement     

Adhikari  Sneha  Kumari  Jyoti  Jacob  Sherry Rachel  Prasad  Pramod  Gangwar  O. P.  Lata  Charu  Thakur  Rajnikant  Singh  Amit Kumar  Bansal  Ruchi  Kumar  Sundeep  Bhardwaj  S. C.  Kumar  Subodh 《Genetic Resources and Crop Evolution》2022,69(2):499-523

Genetic Resources and Crop Evolution - Agricultural production is facing serious threat from various biotic and abiotic stresses specifically under climatic challenges. It is becoming increasingly...  相似文献   

Defining landscape-level forest types: application of latent Dirichlet allocation to species distribution models     

Peters  Matthew P.  Matthews  Steve N.  Prasad  Anantha M.  Iverson  Louis R. 《Landscape Ecology》2022,37(7):1819-1837

Landscape Ecology - Forest type (FT) classification provides useful information to ecologists and forest managers by representing similar sites based on species dominance. Various methods have been...  相似文献