Eastern Indian 3800-million-year-old crust and early mantle differentiation     

Basu AR  Ray SL  Saha AK  Sarkar SN 《Science (New York, N.Y.)》1981,212(4502):1502-1506

Samarium-neodymium data for nine granitic and tonalite gneisses occurring as remnants within the Singhbhum granite batholith in eastern India define an isochron of age 3775 +/- 89 x 10(6) years with an initial (143)Nd/(144)Nd ratio of 0.50798 +/- 0.00007. This age contrasts with the rubidium-strontium age of 3200 x 10(6) years for the same suite of rocks. On the basis of the new samarium-neodynium data, field data, and petrologic data, a scheme of evolution is proposed for the Archean crust in eastern India. The isotopic data provide evidence that parts of the earth's mantle were already differentiated with respect to the chondritic samarium-neodymium ratio 3800 x l0(6) years ago.  相似文献   

Genetics of stem elongation ability in rice (Oryza sativa L.)     

P. K. Saha Ray  D. HilleRisLambers  N. M. Tepora 《Euphytica》1993,74(1-2):137-141

Summary The genetics of stem elongation ability in rice was studied in parents, F₁, F₂ and backcross generations of six crosses. Segregation analysis indicated dominance for stem elongation ability. Estimation of genetic parameters under epistatic model indicated more than one locus control stem elongation ability and both additive and nonadditive gene effects were important. Epistatic effects were predominant over additive and dominance effects with an important role of duplicate type of epistasis. The occurrence of significant additive and additive x additive types of genetic variation and the moderately high broad sense heritability indicated the possibility of selection for an increased manifestation of stem elongation ability.  相似文献   

Molecular confirmation of Gossypium hirsutum chromosome substitution lines     

Sukumar Saha  David M. Stelly  Abdusalom K. Makamov  Mirzakamol S. Ayubov  Dwaine Raska  Osman A. Gutiérrez  Shivapriya Manchali  Johnie N. Jenkins  Dewayne Deng  Ibrokhim Y. Abdurakhmonov 《Euphytica》2015,205(2):459-473

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Fermented mulberry leaf meal as fishmeal replacer in the formulation of feed for carp Labeo rohita and catfish Heteropneustes fossilis—optimization by mathematical programming     

Ali  Saheli  Saha  Subrata  Kaviraj  Anilava 《Tropical animal health and production》2020,52(2):839-849

Tropical Animal Health and Production - Search for cost-effective, eco-friendly and sustainable plant resources as potential feedstuff to replace fishmeal in the formulation of feed for fish has...  相似文献   

Effect of polyacrylamide and gypsum on surface runoff, sediment yield and nutrient losses from steep slopes   总被引：1，自引：0，他引：1  

A. Kumar  A. Saha 《Agricultural Water Management》2011,98(6):999-1004

Hilly terrains with steep slopes and poor vegetative cover are prone to soil erosion. Crop productivity from such lands can be increased by adding correct amounts of soil conditioners such as polyacrylamide (PAM) and gypsum (G) to reduce soil erosion and to improve settling of suspended sediment. The field experiments were conducted in hilly areas with 97% land slope to evaluate the effectiveness of PAM and G when applied as single and concurrent doses of 20 and 2500 kg ha⁻¹, respectively to check surface runoff, sediment yield and major nutrient (N, P, and K) losses under natural rainfall conditions. The results indicate that concurrent application of PAM and G was most effective closely followed by G alone. However, considering the costs of PAM and gypsum and labor involved in their concurrent application on large scale, the application of gypsum alone is recommended in controlling the surface runoff, sediment yield and major nutrient losses from steeply sloped lands in Indian Himalayas.  相似文献   

Host resistance and faecal sporocyst excretion in dogs exposed to repeated infection with Sarcocystis levinei     

P. S. Srivastava  S. R. P. Sinha  P. D. Juyal  A. K. Saha 《Veterinary research communications》1987,11(2):185-190

A marked reduction in the faecal excretion of sporocysts was observed in experimental pups, following the repeated oral administration to them of buffalo cardiac muscle infected with Sarcocystis levinei. Sporocysts excreted from days 9 to 25 post-infection (pi) exhibited a gradual reduction in the quantum. Maximum intensity of excretion of sporocysts was recorded between days 9 and 16 pi, becoming moderate after day 16, light after day 21 and completely absent after day 36. After the subsequent feeding to pups of S. levinei infected buffalo cardiac tissues at 40 day intervals the quantity of sporocysts shed was less, the prepatent period was prolonged and the patent period was considerably shortened. The peak period of excretion varied depending upon the number of exposures of the pups to the infected S. levinei tissues from buffaloes (Bubalus bubalis).  相似文献   

Effect of abscisic acid treatment on water deficits in potato leaves     

N. P. Sukumaran  R. T. Sharda  S. N. Saha 《Potato Research》1975,18(3):433-437

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Blue-green algae or Azolla additions on the nitrogen and phosphorus availability and redox potential of a flooded rice soil     

K.C. Saha  B.C. Panigrahi  P.K. Singh 《Soil biology & biochemistry》1982,14(1):23-26

Freshly-harvested blue-green algae (20 t ha^?1) or Azolla (20 t ha^?1) were incorporated into a waterlogged rice soil and changes of redox-potential and the availability of nitrogen and phosphorus were measured periodically. The soil progressively became reduced where blue-green algae or Azolla had been incorporated. The rate of N release from Azolla was more rapid than from blue-green algae and the amounts released after 7–35 days of flooding were between 41 and 76% and 12 and 35% respectively. Increased P availability was also recorded in soil following the incorporation of blue-green algae or Azolla and reached highest values after 21 days incubation.  相似文献   

Integrated nutrient management (INM) on yield trends and sustainability,nutrient balance and soil fertility in a long-term (30 years) rice-wheat system in the Indo-Gangetic plains of India     

Sushanta Saha  Bholanath Saha  Manabendra Ray  Swapan Kumar Mukhopadhyay  Pallabendu Halder  Anupam Das 《Journal of plant nutrition》2013,36(18):2365-2375

We analyzed data from a long-term rice–wheat cropping sequence to evaluate the effects of integrated nutrient management (INM) on yield trends and sustainability, nutrient balance and soil fertility of the system. After 30th cycle, grain yield of both the crops significantly declined under control and highest rice and wheat grain yields were obtained when 50% N supplied through green manure and farm yard manure, respectively. The magnitude of yield slope under INM was found considerably higher than 100% recommended fertilizer (RDF). Sustainable yield index (SYI) for both the crops were found lower in control but considerably higher with the 100% RDF and under INM. The soils under all the treatments suffered an apparent loss of K and N (except where organics replacing 50% N). Correlation study also reveals K is the sole factor for the yield sustainability as apparent K balance was negatively correlated with SYI and yield slope.  相似文献   

Yield potential of garden pea (Pisum sativum L.) varieties,and soil properties under organic and integrated nutrient management systems     

K. A. Gopinath  Supradip Saha  B. L. Mina  Harit Pande  Narendra Kumar  Anil K. Srivastva 《Archives of Agronomy and Soil Science》2013,59(2):157-167

The identification of suitable crop varieties that respond best to organic management is the key to achieving better crop yields. A field experiment was conducted during the winter season of 2005–2006 and 2006–2007 at Almora (Indian Himalayas) to evaluate the performance of five varieties of garden pea (Pisum sativum L.) and changes in the soil properties under organic and integrated nutrient management (INM) systems. The yield reduction under organic management was 14.4% in 2005–2006 and 10.1% in 2006–2007 compared with INM. Among the garden pea varieties ‘Vivek Matar 9’, ‘Vivek Matar 8’ and ‘Azad pea 1’ produced similar but significantly higher pod yield compared to other varieties. The soil pH, organic carbon, and microbial activities in terms of dehydrogenase and phosphatase (acid and alkaline) were higher in the plots under organic management compared to INM. The latter, however, had higher activity of urease, and N, P, and K contents in soil. We conclude that at least 15–20% price premium for organic garden pea may be required to offset the higher cost of cultivation and low yields under organic production system. Among the garden pea varieties, ‘Azad pea 1’, ‘Vivek Matar 8’ and ‘Vivek Matar 9’ were found suitable for organic cultivation.  相似文献