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Response of direct dry seeded rice (Oryza sativa L.) to seeding dates and seed rates
JD Rangit, S Sharma, DD Gautam
Agronomy Journal of Nepal , 2010, DOI: 10.3126/ajn.v1i0.7538
Abstract: Field studies to access seed rate, seeding dates, and weed infestation in direct dry sseded rice (Khumal -4) were carried out under rice-wheat rotation system at Khumaltar during 2005/06 -2007/08. The broadleaf weeds: Ageratum conyzoides, Commelina diffusa, Eclipta prostrata, Amaranthus veridis , Coronopus didymus, Lactuca sp. the grassy weeds: Echinochloa colona, Cynodon dactylon , and Paspalum distichum and the sedges: Cyperus difformis and C iria were recorded. E colona was the dominant weed in the second year, however A conyzoides was pronounced in the first year. A conyzoides showed an increasing trend over years and became a dominant species ranging from 2-13/0.25m 2 in the 1st year and 53 -144/0.25m 2 in the 3rd year. Significant interaction effect on total weed number/0.25 m 2 was recorded in the 2nd seeding date in all seed rates. Significantly higher weed numbers were recorded in 2nd seeding date and 20 kg/ha seed rate in the 3rd year. There was no significant interaction between different seed rate and seeding date on the gall formation due to Meloidogyne graminicola . Plant height, tillers/m 2 , number of seeds/panicle, and grain yield were not significantly affected due to seeding dates except plant height in 2005/06. Number of tillers/m 2 was significantly different among seed rates and showed slightly increasing trend with higher seed rates. But there was no significant different in grain yield among seed rates except in the year 2005/06. Dry straw weight did not show consistent results among seeding dates. The present study showed that rice seeding can be done in mid May with the seed rates 30–50 kg/ha. DOI: http://dx.doi.org/10.3126/ajn.v1i0.7538 Agronomy Journal of Nepal (Agron JN) Vol. 1: 2010 pp.16-22
Nutrition of the dwarf layer
JD Summers
Genetics Selection Evolution , 1972, DOI: 10.1186/1297-9686-4-2-251
Abstract:
Nutrition de la pondeuse naine
JD Summers
Genetics Selection Evolution , 1971, DOI: 10.1186/1297-9686-3-3-387b
Abstract:
Molecular mechanics and quantum mechanical modeling of hexane soot structure and interactions with pyrene
JD Kubicki
Geochemical Transactions , 2000, DOI: 10.1186/1467-4866-1-41
Abstract: The importance of black carbon in the environment has been recognized for some time (see ref. 4 and references therein). Soot is one type of black carbon generated from combustion of fossil fuels. When soot particles form an aerosol, soot surfaces can act as a heterogeneous catalyst in a number of environmentally important atmospheric reactions. [5-7] When deposited in soils and sediments, soot has a significant influence on the transport and bioavailability of some organic contaminants due to their strong partitioning into soot.[8] In addition, organic contaminants, such as polycyclic aromatic hydrocarbons (PAH), can form simultaneously with soot in the combustion process.[9] Therefore, trace amounts of soot can play a disproportionate role in the long-term sequestration of otherwise biodegradable compounds.[10] In addition, soot may represent the more hydrophobic end-member in the distributed reactivity model for soil organic matter of Weber and co-workers[11] or the glassy/rubbery model of Pignatello and co-workers.[12] Both of these models suggest a component of soil organic matter that has a high affinity for hydrophobic organic molecules with a rigid structure that can support voids large enough for molecules to diffuse into. Soot has these qualities although it certainly is not the only component of soil organic matter that may play a role in the long-term adsorption of organic contaminants.Although the role of soot in the environment and the analytical chemistry of soot have been studied extensively, molecular simulations of soot structure and chemistry are rare. Some studies[13] have modeled activated carbon, but the composition and structure of activated carbon are distinct from those of soot (see ref. 7 and references therein). The goal of this study is to discover if molecular modeling techniques with an appropriate force field will produce structural results consistent with observations of soot structure. If so, molecular modeling may provide a method f
Biological variation in Anopheles darlingi root
Charlwood, JD;
Memórias do Instituto Oswaldo Cruz , 1996, DOI: 10.1590/S0074-02761996000400001
Abstract: behavioural variation in the south american malaria vector anopheles darlingi is described. at the centre of its distribution, in forest areas close to the city of manaus, brazil, it is primarily exophagic and exophilic. mosquitoes from this area are chromosomally diverse. towards the northern edge of its distribution (in guyana and venezuela) it is more endophagic and less diverse chromosomally. similarly in the south (in the state of minas gerais) it is less polymorphic. in this area, however, it is primarily zoophilic and exophagic. evidence is presented that female wing size may vary between populations. the possibility that this widely distributed species may be a complex could have important implications for future malaria control schemes.
Comparative Detection of Infrastructural Land Conversion Dynamics in a Nigerian City Using Space Technology
JD Njoku
African Research Review , 2010,
Abstract: Land use and Land cover dynamics is a major feature of human presence and existence. In and around Owerri Metropolis, in Southeastern Nigeria, land conversion for infrastructural facilities is dominant. This study assesses the conversion rate and classes of land for infrastructure. Landsat TM 86 and ETM+ 2000 were used to detect and map the infrastructural LU/LC dynamics. The imageries were analyzed at the scales of 1:250,000 and 1:150,000. The result showed significant shifts in the aggregate conversion for infrastructures and vice versa, given varieties of forcing agents. Aggregate built up class went up from 438.04 sq. km to 543.88 sq. km between 1986 and 2000. Annual mean coverage rate is about 7.56 sq. km [5.8%] within the study period. The PAVM for the periods were presented as 15.7% and 10.8% respectively. This shows that Land use and Land cover were massively converted into and from infrastructural class.
Sonography in chronic distension of the abdomen and apparent pregnancy
JD Seffah
Nigerian Journal of Surgical Research , 2004,
Abstract: Objective: To find out the causes of chronic distension of the abdomen in women who thought they were pregnant; and the role of sonography in their management. Method: A retrospective study Results: There were 394 patients in the study. The mean age was 36.2 ± 1.7. Uterine fibroids (42%) and ovarian benign tumours (11%) were the main findings. Cancer of the cervix (10%) cancer of endometrium 3.3%; cancer of ovary (3.6%) and medical conditions – obesity (6.3%), cirrhosis of liver 3.8% were also important findings. The sensitivity for using sonography in diagnosing fibroids, ovarian cancers and benign ovarian tumours was 90.4%; 66%; and 86% respectively. Conclusion: Sonography can exclude pregnancy and it is reliable in diagnosing many causes of chronic abdominal distension. Histopathology is mandatory in ovarian tumours
The Protocol to the African Charter on Human and Peoples’ Rights on the Rights of Women in Africa: South Africa’s reservations and interpretative declarations
JD Mujuzi
Law, Democracy & Development , 2008,
Abstract: Jamil Ddamulira Mujuzi notes that, at the time of ratifying the Protocol to the African Charter on Human and Peoples’ Rights on the Rights of Women in Africa (“the Protocol”), South Africa made several reservations and interpretive declarations. The reservations related to the imposition of the death penalty on pregnant and nursing mothers, the registration of customary marriages (article 6(d)) and the nationality or citizenship of children born of alien parents. The interpretive declarations related to Article 1(f), which defines “discrimination against women”, and Article 31, dealing with the question whether the South African Constitution offers more favourable human rights protection than the Protocol. Against the background of a general discussion of reservations and interpretive declarations in international law, the author considers the legal implications of South Africa’s reservations and interpretative declarations. The reservation to article 6(d), he suggests, is in conflict with South Africa’s international treaty obligations under the Protocol with regard to the marriage of girl children and the interpretive declaration to Article 1(f) is vague. However, the article highlights that the other reservations and interpretive declaration further the protection of women’s rights in South Africa. Several recommendations are made on how South Africa can better comply with its obligations under the Protocol.
Caeserean section and birth weight at Korle Bu Teaching Hospital – preliminary report
JD Seffah
West African Journal of Medicine , 2002,
Abstract: Objective: This preliminary retrospective survey was done to find out whether the indications for Caesarean Section had any bearing on birth weight. Method: The foetal outcome for 673 parturient who delivered at the Korle Bu Teaching Hospital between September 1, 1998 and December 31, 1998 was analyzed. Result: Caesarean section done for cephalopelvic disproportion and for 2 or more previous sections yielded the highest mean birth weight (3.43kg ± 0.02kg) and the best foetal outcome. Hypertensive disorders yielded the lowest mean birth weight (1.8kg ± 0.3kg) and poorest foetal outcome. The mean parity and age of the parturient were similarly distributed. Conclusion: The birth weights appeared to vary with the indications for caesarean section. Confounding factors such as the gestational age, parity and age of the parturient need to be controlled in a prospective study in future. Good antenatal supervision could improve on the birth weights Résumé Objectif Ce sondage rétrospectif et préliminaire a été fait pour verifier si les indications de césarienne avait un rapport sur le poids de naissance. Methode Le résultat foetal pour 673 parturients qui ont donné naissance à Korle-Bu- Teaching Hospital entre le 1 Septembre 1998 et le 31 Decembre 1998 a été analysé. Resultat La Césarienne faite pour la disproportion de cephalopelvien et pour deux ou plus d'opérations précédentes ont produit le moyen de poids de naissance le plus haut (3.43kg±0.2kg) et le meilleur résultat foetal. Les déordres hypertensifs ont produit le moyen de poids de naissance les moins bas (1.8kg±0.3kg) et le résultat foetal le plus pauvre. Les moyens d'égalité et d'age des parturients ont été également distributes. Conclusion Les poids de naissance semblent varier avec les indications pour la césarienne. Les facteurs consternés comme l'age des partueients doivent etre controlé dans un sondage dons l'avenir. La bonne surveillance prénatale pourrait ameliorer les poids de naissance. West African Journal of Medicine Vol.21(3) 2002: 212-214
How to manage the cumulative flood safety of catchment dams
JD Pisaniello
Water SA , 2009,
Abstract: Dam safety is a significant issue being taken seriously worldwide. However, in Australia, although much attention is being devoted to the medium- to large-scale dams, minimal attention is being paid to the serious potential problems associated with smaller dams, particularly the potential cumulative safety threats they pose in catchments. This paper establishes the significance of this problem and reviews various Australian policies, including consideration of evidence from past research, to identify the potentially more effective policies with respect to smaller dams/cumulative safety assurance. New ‘case studies’ research that recently tested the effectiveness and coverage of the “strong” dam-safety policy of New South Wales (NSW) is then reported. The case studies comprised 2 samples of 10 hazardous private reservoirs investigated for spillway adequacy in line with state-of-the-art practice: one sample comprised dams supervised under the NSW policy, while the other sample comprised only non-supervised dams. The case studies show the potential effectiveness of strong policy, but also the importance of registering all dams and the need for some form of supervision of even small dams due to either their individual or cumulative hazard potential. The State of Tasmania provides a ‘model’ on how this can be best achieved in line with international best-practice, and this recently became the focus of a comprehensive study. This study involved strategic consideration and assessment of policy responses to the varying issues associated with small-dam safety and practical feedback from key policy actors. The results of this study are also reported here to provide guidance to any other jurisdiction world-wide needing to manage numerous small dams posing cumulative safety threats in catchments.
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