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Search Results: 1 - 10 of 1048 matches for " winter "
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Evaluation of wheat ear insects in large scale field in central Germany  [PDF]
Nawal Gaafar, Christa Volkmar
Agricultural Sciences (AS) , 2010, DOI: 10.4236/as.2010.12010
Abstract: Wheat ear insects in large scale winter wheat field in Salzmünde (SaxsonyAnhalt) central Germany were evaluated. The present study aimed at studying the abundance of wheat blossom midges WBM, Sitodoplosis mosellana (Géhin), Contarinia tritici (Kirby) and thrips, Li mothrips cerealium (Haliday) and Haplothrips tritici (Kurdjumov). Infestation in winter wheat during the growing seasons 2007, 2008 and 2009 was evaluated. Three methods were used to determine population densities and damage of wheat midges and thrips; pheromone traps, inspection of ear insects and water traps. A strong correlation between midge’s catches and weather conditions was obtained in field ob servations. A positive correlation between phe romone catches and ear infestation levels was recorded; it was higher in 2008 than in 2009. On the other hand, in 2007 there was no synchro nization; S. mosellana hibernated emerged too late to coincide with the susceptible wheat growth stages. The chemical treatment applied at 2008 for highly infestation; there were sig nificant differences in thrips and midge num bers between treated and untreated. Thrips and midge numbers were lower in the treated than in control. The high midge populations in water traps were recorded at growth stages 7779 and 83 and the low populations were recorded at GS 75 and 7577. This gives a reliable base for de cision making to midges control.
Growth Performance of Moringa oleifera and Moringa ovalifolia in Central Namibia Semi-Arid Rangeland Environment  [PDF]
Morlu Korsor, Charles Ntahonshikira, Haruna M. Bello, Habauka M. Kwaambwa
Agricultural Sciences (AS) , 2019, DOI: 10.4236/as.2019.102011
Abstract: The objective of this study was to compare the field growth performance of Moringa oleifera and Moringa ovalifolia in semi-arid environment of central Namibia rangeland. This part of Namibia has both arid and semi-arid climates. These climates require the growing of drought-resistant fodder trees to aid in the provision of animal feed or supplement. This is paramount to livestock farmers who are striving to meet the feed demand of their animals especially during winter and drought periods. It is upon this background that both Moringa species were grown to evaluate their field growth performances. Moringa oleifera grew faster with 224.9 cm and 281.45 cm heights than Moringa ovalifolia that had 77.025 cm and 113.2 cm heights in 2014/2015 summer season (October 2014 to April 2015) and 2015/2016 summer season (October 2015 to April 2016), respectively, although Moringa ovalifolia is native to Namibia. In Namibia, summer usually starts October and ends April the follow year after which winter follows. Moringa oleifera grew significantly higher (P < 0.05) in heights compared to Moringa ovalifolia, though they belong to the Moringaceae family and were grown under the parallel conditions. Therefore, Moringa oleifera would serve as a better alternative for improving rangelands’ productivity under these adverse climatic and environmental conditions since it can grow faster than Moringa ovalifolia, whose characteristic leads to the rapid establishment of trees and large quantity of leaf-biomass production.
Historic development of winter-wheat yields in five irrigation districts in the sonora desert, Mexico
Salinas-Zavala,César A; Salvador E,Lluch-Cota; Fogel,Ira;
Interciencia , 2006,
Abstract: the history of development of winter wheat cultivation in five irrigation districts in northwestern mexico is analyzed. the accelerated growth of winter wheat yields in northwestern mexico can be described by adjustment of the parameters of the logistic model. a common variation in the analyzed series exists, which is determined by the positive tendency of the series, a product of the green revolution. this event explains 80% of the observed variation. nevertheless, social and economic conditions, and regional geography, suggest differential development. four agricultural developments are defined: borders (mexicali-san luis-río colorado), indigenous agriculture (ejidales colonias yaquis), private agriculture (valle del yaqui and mayo), and pioneers (valle de santo domingo in baja california sur). the development of each group is compared with the national efficiency curve. the purpose is to compare wheat yields in the main irrigated valleys of northwestern mexico during the green revolution and the following stabilization, based on social and historic events. the possibility of increasing productivity as a function of the historic maximum reached at regional and national levels is discussed
Población expuesta a inviernos fríos en México
Ortiz álvarez, María Inés;Vidal Zepeda, Rosalía;
Investigaciones geográficas , 2006,
Abstract: in the present investigation the impact of the cold season of the year is analyzed. it prevails in extensive mountainous regions of the country and exposes to its settlers to low winter temperatures that affect their health and their economy. it is an interdisciplinary study that evaluates the distribution of the population affected by cold and very cold winter on municipal scale, in an extensive region that is identified from the climatological point of view. in the year 2000 the big population affected by this phenomenon represented 69% of the national total, located in 22 federal states grouped in two areas: one to the north and another one to the center of the country. resulting maps show the distribution of the population in four types of winter, classified by the duration and intensity, according to the number of cold months in which the sharp diminution of the temperature is evident.
Plasma retinol concentration in grazing heifers: First data obtained from a dairy herd in the south of Chile
Chihuailaf,RH; González,CS; Wittwer,F; Contreras,PA;
Archivos de medicina veterinaria , 2008, DOI: 10.4067/S0301-732X2008000100009
Abstract: there is no information available about plasma retinol concentration in grazing heifers in chile, for this reason the plasma retinol concentration was measured in dairy heifers grazing during the winter and spring seasons on paddocks in the south of chile. fifteen clinically healthy friesian heifers from a dairy farm located in the valdivia province, chile, aged between 16 and 18 months, were used. the animals were grazing on fertilized natural pastures from july to december. blood samples were taken monthly from each animal and plasma retinol concentrations were determined using reverse-phase high performance liquid chromatography. mean (± sd) plasma retinol concentration was 0.46 ± 0.09 μg/ml with values fluctuating between 0.18 - 0.69 μg/ml. plasma retinol concentration was lower in winter (0.42 ± 0.09 μg/ml, with values fluctuating between 0.18 to 0.57 hg/ml) and higher in spring (0.50 ± 0.09 μg/ml; with values fluctuating between 0.29 to 0.69 μg/ml). the average values obtained in this study constitute the first data currently available in chile regarding plasma retinol concentration in grazing cattle
Produ??o de sementes de cevadilha-vacariana (Bromus auletius Trinius) em fun??o da cronologia de desenvolvimento dos perfilhos reprodutivos
Maia, Manoel de Souza;Silva, Gustavo Martins da;Peske, Silmar Teichert;Moraes, Carlos Otávio Costa;Medeiros, Renato Borges de;
Revista Brasileira de Sementes , 2006, DOI: 10.1590/S0101-31222006000300003
Abstract: native pastures constitute the feed basis for livestock in southern brazil. these natural grazing fields are constituted mainly by summer species, paralyzing their growth and loosing quality in the autumn-winter period. this factor causes high economic losses to the livestock producers. bromus auleticus is a temperate climate perennial grass, whose contribution to forage occurs at a time of crucial feeding needs of the herds. the objective of the present study was to evaluate the yield components and the quality of b. auleticus seeds according to the chronological order of reproductive tiller development. thirty representative plants were selected and their tillers were labeled according to the chronological order of differentiation and elongation. harvesting was done at the time of full maturation of each tiller, generally 30 days after maximum anthesis. the chronological order of tiller development determined the yield of bromus auleticus seeds. seed yield of b. auleticus was similar in the first, second and third tillers which developed in a plant, being responsible for about 75% of the yield. these reproductive tillers were taller and had more seeds per panicle, heavier and higher germinating seeds, and had less seed dormancy than the other tillers on the same plant.
Novo, Maria do Carmo de Salvo Soares;Tanaka, Roberto Tetsuo;Mascarenhas, Hipolito Assun??o Antonio;Bortoletto, Nelson;Gallo, Paulo Boller;Pereira, José Carlos Vela Novo Alves;Vargas, álvaro Augusto Teixeira;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000100021
Abstract: the objective of these experiments was to study the effect of nitrogen and potassium fertilizations on the response to nodulation, nitrogen fixation, nitrogen seed content and yield of two soybean cultivars planted during the winter season. they were installed on the following soils: eutric lixisol (mococa) and rhodic ferralsol (ribeir?o preto and votuporanga, sp, brazil). the treatments consisted of three rates of nitrogen (0, 50 and 100 kg.ha-1 of n) as urea, three of potassium (0, 30 and 60 kg.ha-1 of k2o) as chloride and two soybean cultivars (iac-8 and iac-14). the experimental design was a random factorial with four replications. soybean seeds of all treatments were inoculated with a commercial inoculant. at flowering, plants were sampled to evaluate nodulation and nitrogenase activity. at maturity, plants were harvest and seeds weighed.the results showed that inoculation did not provide the amount of nitrogen required to maximize soybean yield in the winter. the nitrogen treatment reduced nodulation and nitrogen fixation, but increased seed yield at the three localities. potassium fertilization did not have any significant effect on nodulation, nitrogen fixation and yield of soybeans. increased however dry matter weight and number of nodules of the cultivar iac-14.
Productivity of some winter wheat genotypes
Biberd?i? Milan,?or?evi? Midrag,Bara? Sa?a,Deleti? Neboj?a
Genetika , 2005, DOI: 10.2298/gensr0502131b
Abstract: Yields given by different genotypes are affected by many factors, but mostly by genotype, climatic conditions and applied growing practice. Therefore, the aim of this study was to establish productivity of many winter wheat genotypes in southern Serbia, through macro-trials. The results showed the difference of grain yield mean between the investigated seasons, and that difference amounted about 1300 kg/ha. The average yield was the highest in cultivars Toplica, Stamena, Evropa, NS-rana 5, and Renesansa. The lowest grain yield was given by cultivars Tina, Sara, Sre a, and Mina.
The effect of Winter barley variety and technological factors during malting on malt quality
Gruji? Olgica S.,Pejin Jelena D.,Pr?ulj Novo M.
Acta Periodica Technologica , 2005, DOI: 10.2298/apt0536033g
Abstract: The analysis of six winter barley varieties, crop 2004, from Kragujevac location, was performed along with micromalting and analysis of the produced malts. The aim of this analysis was to determine which technological factors in malting various barley varieties can give the best malt quality. During malting, changes of various technological factors were performed, both in the steeping and germination phase. As a result of complete analysis of the produced malts it appeared that barley variety had the most important influence on produced malt quality.
Producing kombucha beverage from winter savory (Satureja montana L.) tea inoculated by pellicle
Cvetkovi? Dragoljub D.,Markov Sini?a L.
Acta Periodica Technologica , 2006, DOI: 10.2298/apt0637119c
Abstract: The work is concerned with the possibility of preparing kombucha beverage from sweetened winter savory (local name Rtanj tea) inoculated with the pellicle in a quantity of 2 -51 in the vessels (glass containers) volume of 2 - 6 l. It was found that the process lasts a few days (2 - 5) longer than the traditional process of biotransformation of black tea into kombucha. It was also concluded that the rate of the process depends mostly on the volume container: medium ratio. In the subsequent kombucha fermentations the metabolic activity of the yeast and acetic fermentation cells did not change. The rate of the process was not influenced by the physiological state of the cells in the pellicle with the capacities larger than 31.
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