Use of Mechanical Power for Rotary Weeding     

Nestor C. Navasero  Amir U. Khan 《国际虫害防治杂志》2013,59(1):87-92

Suppressive soils and plant disease.

Edited by R. W. Schneider. American Phytopathological Society, St. Paul, Minnesota, 1982. ISBN 0 89054 048 9. Pp. 88. Price APS members US $8.00, nonmembers US $9.00.

Annual review of phytopathology.

Volume 20. Edited by R. G. Grogan, G. A. Zentmyer and E. B. Cowling.

Annual Reviews Inc., Palo Alto, California, 1982. ISBN 8243 1320 8. Price US$ 22.00 (USA), US$ 25.00 (elsewhere).

The locust and grasshopper agricultural manual.

Centre for Overseas Pest Research, London, 1982. ISBN 0 85135 120 4. Pp.690. Price £50.00.

CRC handbook of pest management in agriculture.

Edited by D. Pimental. CRC Press, Inc., Boca Raton, Florida, USA, 1982. Three volumes. ISBN 0 8493 3841 7 (Vol. I). Vol. I. Pp. 597, price US$ 86.00 (US$ 99.00 outside US). Vol. II. Pp. 501, price US$ 76.00 (US$ 87.00 outside US). Vol. III. Pp. 656, price US$ 86.00 (US$ 99.00 outside US).

Weed science: principles and practices.

G. C. Klingman and F. M. Ashton with editorial assistance of L. J. Noordhoff. Second Edition. John Wiley — Interscience, New York, 1982. ISBN 0 471 08487 5. Pp. 449. Price £19.00.

Biology and ecology of weeds.

Edited by W. Holzer and M. Numata. Geobotany Series 2. Dr. W. Junk Publishers, The Hague, 1982. ISBN 90 6193 682 9. Pp.461. Price US$ 99.50.

Plantas daninhas do Brasil.

H. Lorenzi. Published by the author, Nova Odessa, S. P., Brasil, 1982. Pp. 425.

Integrated weed management systems technology for crop production and protection.

Proceedings of a Symposium of the Weed Science Society of America, Las Vegas, February 1981. Supplement to Weed Science volume 30, 1982. Pp. 54.

Weeds and weed control in Asia.

Food and Fertiliser Technology Centre, Taipei, Taiwan (FFTC Book Series No. 20), 1981. Pp. 259.

Building a sustainable society.

L. R. Brown. W. W. Norton &; Co., New York and London, 1982. ISBN 0 393 01482 7. Pp. 433. Price US $14.95  相似文献   

Influence of eCG and breed on the number of oocytes collected and the production of in vitro embryos of young goats during the reproductive season     

Montes-Quiroz  Gabriela Lisset  Sánchez-Dávila  Fernando  Domínguez-Díaz  David  Vázquez-Armijo  José Fernanco  Grizelj  Juraj  Ledezma-Torres  Rogelio A.  Cervantes-Vega  Rubén  Arce-Vázquez  Nestor  Garza-Brenner  Estela  Bernal-Barragán  Hugo 《Tropical animal health and production》2019,51(8):2521-2527

Tropical Animal Health and Production - The objective of this study was to determine the effect of breed and equine chorionic gonadotropin (eCG) on ovarian response and in vitro embryo production...  相似文献   

Improved Mass Screening of Tolerance to Iron Toxicity in Rice by Lowering Temperature of Culture Solution     

Akifumi Shimizu  Corinta Q. Guerta  Glenn B. Gregorio  Hiroshi Ikehashi 《Journal of plant nutrition》2013,36(9):1481-1493

Breeding for tolerance to iron (Fe) toxicity in rice (Oryza sativa L.) is hindered by lack of a suitable screening technique. In the culture solution methods used to date, a major difficulty has been maintaining an excess level of iron concentration in order to reveal toxicity symptoms. Experimental results showed that this problem was solved by lowering the solution temperature to around 20°C, at which leaf discoloration in susceptible cultivars became more pronounced. At 20°C Fe uptake was increased from a threshhold content of 300 mg/kg of dry weight of shoot for toxic symptom to more than 1000mg/kg in susceptible and in tolerant cultivars. Concentrations of other related minerals in the plant tissue, i.e., potassium (K) and phosphorus (P), were not affected by the low solution temperature itself but by Fe content, which can be inferred on the basis of their response curves to the excess Fe treatment. Using the proposed screening method makes it possible to obtain reproducible results in screening a large number of plants or breeding lines.  相似文献   

Disentangling the effect of size and competition: a growth model for Aucoumea klaineana     

Nestor Laurier Engone Obiang  Alfred Ngomanda  Lee J. T. White  Kathryn J. Jeffery  Éric Chézeaux  Nicolas Picard 《Annals of Forest Science》2013,70(3):241-249

• Context Okoume (Aucoumea klaineana) is the most important timber species in Gabon, while being classified as vulnerable in the IUCN red list. Thousands of growth measurements for this species have been performed since the 1950s but, because of a lack of integrated analysis, did not bring a consistent view on its growth pattern.
• Aims This study aims at disentangling the effects of tree size and local competition on tree growth.
• Methods A growth model was fitted for okoume, using data from seven sites in Gabon and Congo. The growth model was designed to be useful for forest management, which means that it relied on variables that could be computed using forest inventory data.
• Results A lognormal growth model with a negative response to stand basal area was selected. A significant residual site effect on growth was found, with a slower growth in the sites near the border of the natural range of okoume than in the sites far from it.
• Conclusion Growth strongly responded to local stand attributes such as tree density and basal area. Growth decrease with stand age in monodominant okoume stands was correctly predicted, although tree age was not incorporated into the model.

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Circulating IGF-I in plasma of growing male and female turkeys of medium and heavy weight lines   总被引：1，自引：0，他引：1  

W.L. Bacon  K.E. Nestor  D.A. Emmerson  R. Vasilatos-Younken  D.W. Long 《Domestic animal endocrinology》1993,10(4):267-277

Plasma concentrations of insulin-like growth factor-I (IGF-I) were determined in male and female turkeys from a medium weight (RBC2) and a related heavy weight line (F) from 1 to 28 wks of age. At hatch, the concentrations of IGF-I were relatively low and not different between lines or sexes. During the neonatal period (1 to 7 wks), the concentrations of IGF-I increased and were higher in the faster growing F line and in males. During the juvenile period (8 to 15 wks) the concentrations of IGF-I were higher in males but not different between lines. During the preadolescent period (16 to 21 wks), the concentrations of IGF-I were higher in males but was not different between lines in males while the females of the RBC2 line had higher concentrations than females of the F line. During the adolescent period (22 to 28 wks) the concentrations of IGF-I were higher in males but was not different between lines in males while the females of the RBC2 line had higher concentrations than females of the F line. A phenotypic correlation (+.25) between plasma IGF-I and growth rate was present after statistical absorption of model effects during the neonatal period but not at the later ages. We conclude that IGF-I concentration was positively correlated with growth rate during the neonatal period, but that this relationship changed during the preadolescent and adolescent periods so that IGF-I concentrations were not related to growth rate in males but were negatively related to growth rate in females.  相似文献   

Genetic variation in resistance of turkeys to experimental challenge with Pasteurella multocida.     

R E Sacco  Y M Saif  K E Nestor  N B Anthony  D A Emmerson  R N Dearth 《Avian diseases》1991,35(4):950-954

Six hundred fifty-five male and female turkeys representing four genetic lines were challenged in 10 experiments over a 3-year period with a field isolate of Pasteurella multocida. Poults were challenged at 45 days of age with 1 ml of an inoculum containing 1.2 x 10(7) bacteria per ml. The lines of turkeys included two randombred control lines (RBC1 and RBC2), a subline (E) of RBC1 selected for increased egg production, and a subline (F) of RBC2 selected for increased 16-week body weight. The number of days from exposure to severe clinical signs or death for Line F (5.8 days) differed significantly from that of Line E (8.2 days), Line RBC1 (8.0 days), and Line RBC2 (8.2 days). There were no significant differences due to sex of poult for number of days from exposure to severe clinical signs or death. Overall mortality observed was 51.2%. Mortality was highest for Line F (72.1%) and differed significantly from that of the other lines. Mortality among male poults did not differ significantly from mortality among female poults.  相似文献   

Radiographic Diagnosis: Laryngeal Paralysis Secondary to Pulmonary Squamous Cell Carcinoma in a Cat     

Derek D. Nestor  DVM    Diana S. Rosenstein  DVM 《Veterinary radiology & ultrasound》2004,45(4):325-326

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Morphological Investigations of the Surface Epithelium of Ductuli Efferentes of Black Isogenic Mice (Mus musculus)     

A. M. Orsi  S. M. M. Matheus  E. A. Gregorio  C. C. L. Beu 《Anatomia, histologia, embryologia》1998,27(4):215-218

Morphological investigations of the epithelial cell types that line the ductuli efferentes (DE) of black isogenic mice confirm absorption of the luminal fluid phase by endocytosis as the main function of ductuli efferentes (DE) in this species. Furthermore, all the histochemical and ultrastructural observations on the DE epithelial histoarchitecture indicate other cellular functions such as exocytosis and probably secretion, including an aprocrine secretory process.  相似文献   

Nursery Training for Smallholders: An Evaluation of Two Extension Programs in the Philippines     

Jack Baynes  Nestor Gregorio 《Small-Scale Forestry》2008,7(3-4):387-401

High-quality seedlings are a prerequisite for successful forestry and agroforestry expansion in developing countries. Unfortunately, in the central Philippines, as supplies of timber from native forest have diminished in recent years, the expansion in planting of timber trees has been retarded by sub-optimal production of seedlings from small-scale nurseries. To address this problem, an extension program supported by the Australian Centre for International Agricultural Research (ACIAR) has attempted to improve the quality of seedlings produced in home nurseries, by assisting smallholders to raise and out-plant seedlings. A complementary program undertaken as part of the Community Agricultural Technology Program (CATP) has attempted to provide community workers and managers of small-scale nurseries with the benefit of recent ACIAR nursery research. Extended assistance in the ACIAR program addressed smallholders’ low self-efficacy in nursery technology and was successful in assisting them to grow high quality seedlings. A limited program of assistance was relatively unsuccessful. Evaluation of the CATP program showed that prior to the training, CATP participants were unfamiliar with some aspects of basic nursery technology. Consequently, they may have been unable to provide competent advice to smallholders. This implies that—as with the ACIAR training—extended training and follow-up assistance may be the key to improving the quality of seedlings for forestry and agroforestry expansion in the central Philippines.  相似文献   

Rural housing is related to plant invasions in forests of southern Wisconsin,USA   总被引：2，自引：0，他引：2  

Gregorio I. Gavier-Pizarro  Volker C. Radeloff  Susan I. Stewart  Cynthia D. Huebner  Nicholas S. Keuler 《Landscape Ecology》2010,25(10):1505-1518

Forests throughout the US are invaded by non-native invasive plants. Rural housing may contribute to non-native plant invasions by introducing plants via landscaping, and by creating habitat conditions favorable for invaders. The objective of this paper was to test the hypothesis that rural housing is a significant factor explaining the distribution of invasive non-native plants in temperate forests of the Midwestern US. In the Baraboo Hills, Wisconsin, we sampled 105 plots in forest interiors. We recorded richness and abundance of the most common invasive non-native plants and measured rural housing, human-caused landscape fragmentation (e.g. roads and forest edges), forest structure and topography. We used regression analysis to identify the variables more related to the distribution of non-native invasive plants (best subset and hierarchical partitioning analyses for richness and abundance and logistic regression for presence/absence of individual species). Housing variables had the strongest association with richness of non-native invasive plants along with distance to forest edge and elevation, while the number of houses in a 1 km buffer around each plot was the variable most strongly associated with abundance of non-native invasive plants. Rhamnus cathartica and Lonicera spp. were most strongly associated with rural housing and fragmentation. Berberis thumbergii and Rosa multiflora were associated with gentle slopes and low elevation, while Alliaria petiolata was associated with higher cover of native vegetation and stands with no recent logging history. Housing development inside or adjacent to forests of high conservation value and the use of non-native invasive plants for landscaping should be discouraged.  相似文献