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Search Results: 1 - 10 of 735 matches for " cultivars "
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Cultivares de soja [Glycine max (L.) Merrill] para cultivo de ver?o na regi?o de Lavras-MG
Guimar?es, Fabrício de Souza;Rezende, Pedro Milanez de;Castro, Evaristo Mauro de;Carvalho, Eudes de Arruda;Andrade, Messias José Bastos de;Carvalho, Everson Reis;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000400010
Abstract: the purpose of this study was to evaluate soybean materials [glycine max (l.) merrill] for grain yield and other agronomic traits in two agricultural years during the summer in the years of (2003/04 and 2004/05) trying to provide subsidies for the right choice of the cultivars for lavras-mg region. the experiment was evaluated in a complet block design with three replications in a factorial structure 2 x 40; 2 agricultural years (2003/04 and 2004/05) and 40 soybeans cultivars. lavras-mg region is good for soybean culture development, because the cultivars showed desirable agronomical characteristics during the two year-experiment, the average yield was 2870 kg.ha-1. the best cultivars for general standard during the two years were vencedora (4515 kg.ha-1), conquista (4209 kg.ha-1) and monarca (4121 kg.ha-1) that also showed good conditions for the mechanical harvest.
Comparison of Different Cultivars of Blueberry Overwintering Ability in Qingdao of China  [PDF]
Wan-Ping Liu, Shu-Chai Su, Xiao Liu, Zhi-Xia Hou
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.33047
Abstract: In order to select severe overwintering abilitied blueberry cultivars for cold resistance of annual branches, promoting breeding high quality cultivars, a study had been conducted into field-planting shoots overwintering ability and the relative conductivity, MDA content, SOD of 7 different kinds of blueberries under artificial cooling process. According to survey results, under field conditions, Different cultivars of blueberries showed significantly difference, ranging from 56.67% of Bluegold to 12.80% of Darrow. With the temperature decreasing, changes of relative conductivity, MDA content and SOD in annual branches had a strong regularity and the hardiness of these cultivars is: Northland > Chippewa > Coville > Bluecroup > Darrow > Bluegold > Powderblue.
Effect of Different Levels of Nitrogen and Phosphorus on the Phenology and Yield of Maize Varieties  [PDF]
Fahad Khan, Sehrish Khan, Shah Fahad, Shah Faisal, Saddam Hussain, Saqib Ali, Ashfaq Ali
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.517272
Abstract:

An experiment was conducted at Malakabad (Gadera) Dargai Malak and KPK to study the effect of different levels of nitrogen and phosphorus on the yield of maize varieties in randomize complete block design with split plot arrangement. Different fertilization treatments (0:0, 100:0, 100:50, 100:100, 150:0, 150:50, 150:100, 150:150 N:P kg·ha-1) were assigned to main plot while, maize varieties (Azam, Jalal and local) were kept in sub-plots. Data regarding emergence m-2, days to emergence, days to tasseling, days to silking, number of cobs plant-1, plant height, grains cob-1, 1000-grain weight and grain yield were recorded. Emergence m-2, days to emergence, days to tasseling, days to silking, plant ha-1 at harvest were not significantly affected by different levels of nitrogen and phosphorus while number of cob plant-1, thousand

Effect of Infestation of Alabama argillacea (Lepidoptera: Noctuidae) at Different Ages of Cotton Plants in Yield  [PDF]
Marcos Doniseti Michelotto, Jacob Crosariol Netto, José Fernando Grigolli, Antonio Carlos Busoli, Willians Cesar Carrega, Everton Luis Finoto, Juliana Altafin Galli
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.510159
Abstract:

The cotton leafworm is an important defoliating pest of cotton in Brazil, and occurs in all regions where the crop is cultivated. The purpose of this study was to evaluate the effect of larval densities of A. argillacea after different infestation periods on the yield components of four cotton cultivars. The experiment was carried out in Pindorama, SP, Brazil, in the 2008/2009 growing season. The cultivars IAC-25, DeltaOPAL, Fibermax 966 and Fibermax 993 were artificially infested with A. argillacea larvae at three times (30, 60 and 90 DAE) and four densities (0, 2, 4, and 6 larvae per plant). The average boll weight (g), fiber percentage (%), 100-seed weight (g) and yield (kg·ha-1) were evaluated. With increasing infestation density of A. argillacea, the cotton yield of the cultivars decreased. The presence of larvae significantly reduced the weight of 100 seeds of cultivar Fibermax 966. Initial infestations reduced the boll weight of IAC-25 and DeltaOPAL, while cultivars Fibermax 966 and Fibermax 993 were most affected by late infestations. Early infestation compromised fiber percentage of cultivar DeltaOPAL and late infestations were most harmful to cultivar Fibermax 966. Early A. argillacea infestation reduced the yield of DeltaOPAL, while infestations 60 DAE caused the most damage to IAC-25, and the other cultivars were not affected by the moment of infestation.

Yield and Quality of Forage Oat (Avena sativa L.) Cultivars as Affected by Seed Inoculation with Nitrogenous Strains  [PDF]
Muhammad Saleem, M. Shahid Ibni Zamir, Ihtishamul Haq, M. Zahid Irshad, M. Kamran Khan, M. Asim, Qamaruz Zaman, Ihtisham Ali, Aman Khan, Saeedur Rehman
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.619316
Abstract: Nitrogen availability can be enhanced with the application of nitrogen fixing bacteria and it may be helpful in increasing forage yield and improving quality of oat. Therefore, a field trial to evaluate the effect of seed inoculation with nitrogen fixing bacteria on forage yield and quality of oat was carried out at Agronomic Research Area, University of Agriculture, Faisalabad during Rabi season 2013-14. The experiment was laid out in Randomized Complete Block Design (RCBD) with factorial arrangements using three replications. The experiment was comprised of two integrated approaches. The first approach was oat cultivars consisting of four treatments, V1 (AVON), V2 (S-2000), V3 (S-2011) and V4 (PD2LV65) and the second approach was seed inoculation consisting of three treatments, S0 (control), S1 (Azotobacter spp.), S2 (Azospirillum spp.). Fisher’s analysis of variance technique was used for statistically interpretation of data by using least significant difference (LSD) test at 5% level of probability. Nitrogen fixing bacteria significantly affect the germination count (m2), plant height (cm), number of tillers (m2), number of leaves per tiller, leaf area per tiller (cm2), green forage yield (t·ha-1) and dry matter yield (t ha-1). The maximum green forage yield (85.2 t·ha-1), dry matter yield (14.1 t ·ha-1) and crude protein (11.5%) were recorded where Azotobacter inoculation was applied. The interaction between cultivars and nitrogenous strains was significant for green forage yield (t·ha-1), dry matter yield (t·ha-1) and crude protein (%). Conclusion showed that cultivar Sargodha-2011 which was inoculated with Azotobacter spp. gave higher forage yield of good quality.
The Potential Role of Cu2+ and Combined Action with IAA on Tolerance Strategy of Two Broad Bean Cultivars  [PDF]
Hamdia M. Abd El-Samad, Mohamed Abdo K. Shaddad, Kholoud N. Abd El-Hakeem
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.910153
Abstract: The present work was conducting to study the strategy response of two broad bean cultivars Assiut 84 and Assiut 125 to different Cu2+ concentrations 100 ppm, 200 ppm, 300 ppm and 350 ppm in addition to control and interactions with IAA treatments. The dry matter exhibited the biphasic effect of Cu2+ on the growth criteria of the two broad bean cultivars. While the lower and moderate doses of Cu2+ (100 ppm and 200 ppm) stimulated the growth of the two cultivars, the higher doses revealed the opposite event where the growth dropped in both cultivars. This effect was more pronounced in cv. Assiut 84 than in cv. Assiut 125 and also at the higher Cu2+ concentration the growth dropped slightly in cv. Assiut 84 and highly significantly in cv. Assiut 125. The percent of increase in dry matter at 200 ppm in stem and leaf of cv. Assiut 84 was 120.45% and 155.31%, otherwise this percent of increase in these organs of cv. Assiut 125 was 114.29% and 131.41%. However the percent of reduction at 350 ppm Cu2+ in root and stem of cv. Assiut 84 was 74.13%, 79.23% and in root, stem and leaf of cv. Assiut 125 was 59.27%, 70.91%, 70.76% compared with control plants. Soluble carbohydrate in cv. Assiut 84 and cv. Assiut 125 was markedly increased while soluble protein was decreased in root, stem and in leaves at lower Cu2+ concentration.
Evaluation of Dryland Wheat Cultivars on the Market in South Africa for Resistance against Four Known Russian Wheat Aphid, Diuraphis noxia, Biotypes in South Africa  [PDF]
Astrid Jankielsohn
Advances in Entomology (AE) , 2019, DOI: 10.4236/ae.2019.71001
Abstract: An increased wheat yield potential under changing environmental conditions is a challenge in agriculture. Resistant wheat lines can yield more than susceptible wheat lines in the presence of Russian wheat aphid infestation. There are currently four Russian wheat aphid (RWA) biotypes known in South Africa with different virulence against different wheat cultivars. To keep up with the ever-changing patterns it is necessary to screen the cultivars for resistance against these Russian wheat aphid (RWA) biotypes. All the dryland wheat cultivars on the market were evaluated for resistance against the four known Russian wheat aphid (RWA) biotypes in South Africa. Through this evaluation, the status of Russian wheat aphid (RWA) resistance in South African dryland wheat cultivars can be updated to adapt to environmental changes and the wheat industry can adapt to changes in virulence of Russian wheat aphid (RWA) biotypes that may cause damage to Russian wheat aphid (RWA) resistant cultivars, subsequently affecting yield. Evaluations were done in the glasshouse by screening wheat cultivars against four different South African Russian wheat aphid (RWA) biotypes, RWASA1-RWASA4, under controlled conditions. The glasshouse evaluations showed that out of the 19 dryland wheat cultivars currently on the market in South Africa 16 are resistant against RWASA1, 7 are resistant against RWASA2, 7 are resistant against RWASA3 and 5 are resistant against RWASA4. Dryland wheat cultivars were also evaluated under field conditions at four different field localities. In the field, 5 cultivars were resistant to RWASA3 at two localities, respectively, and 3 and 5 cultivars were resistant to RWASA4 at two localities, respectively. Since Russian wheat aphid (RWA) damage can influence the final yield of a wheat cultivar significantly, changing conditions can influence both resistant cultivars, and the virulence of Russian wheat aphid (RWA). It is advisable to evaluate wheat cultivars on the market under different conditions and with all known Russian wheat aphid (RWA) biotypes in an area.
Initial Growth and Gas Exchanges of Plants of Colored Cotton Submitted to Saline Stress  [PDF]
Hallyson Oliveira, Ronaldo do Nascimento, Samuel Silva, José Alberto Ferreira Cardoso, Rafaela Felix Basílio Guimar?es, Elka Costa Santos Nascimento
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.912115
Abstract: The objective of the research was to evaluate the effects of saline stress on the initial growth and physiological parameters of three varieties of cotton plants, being two cultivars of colored fiber (BRS Topázio and BRS Verde) and one of white fiber (BRS 286). The experiment was conducted under greenhouse conditions. After chemical depletion with sulfuric acid, five seeds were seeded in polyethylene pots of 20 kg, leaving only one plant per pot after thinning. The experimental design was completely randomized, with a factorial scheme of 3 × 5, with five replications, totaling 75 plots, being three cotton varieties and five saline stress treatments—1.1; 3.1; 5.1; 7.1; 9.1 dS m1. The evaluations occurred at 15 and 30 days after the beginning of the treatments (DAT) for growth variables (plant height, stem diameter, number of leaves and leaf area) and gas exchange (stomatal conductance, net photosynthesis rate and transpiration. The variety that was most resistant to the salt stress levels studied was BRS 286, followed by BRS Topazio and BRS Verde.
Características Fisiológicas, Contenido de Aceite y Proteína en Genotipos de Soya, Evaluadas en Diferentes Sitios y épocas de Cosecha, Brasil
Minuzzi,Andréia; Mora,Freddy; Sedrez Rangel,Marco Ant?nio; De Lucca e Braccini,Alessandro; Scapim,Carlos Alberto;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000400003
Abstract: the objective of this study was to evaluate physiologic characteristics and oil and protein content in four soybean (glycine max (l.) merr.) cultivars (brs 133, brs 206, brs 239 and cd 202) which were harvested in four different periods (r7 stage, 7, 14 and 21 days after the first harvest stage) and produced over the growing season 2004-2005 in two sites of the mato grosso do sul state, brazil, sidrolandia (21o00? s lat, 55o01? w long), and dourados (22o11? s lat, 54o55? w long). a randomized complete block design was used in a split-plot experiment with three replicates. seeds were evaluated by means of a germination test, accelerated aging and seedling emergence on sand. oil content and protein in seed and soybean meal were also analyzed. brs 133 and brs 206 cultivars showed higher values of seed-protein, 35.67 and 35.0%, respectively, which also evidenced higher soybean meal protein content, 43.04 and 46.83%, respectively. the highest oil content was found in cv. cd 202, with a mean value of 22.63%. germination and seed vigor potentials were significantly affected by harvest periods, which presented a significant reduction when soybean harvest was delayed, such characteristics could affect the plant potential for fast growth and adequate develop of soybean plants.
Produ??o e aceitabilidade de cenoura sob cultivo organico no inverno e no ver?o
Paulus, Dalva;Moura, Cláudia de A;Santin, Anderson;Dalhem, Ana Regina;Nava, Gilmar A;Ramos, Celso EP;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000300015
Abstract: for the carrot cultivation it is important to understand the adaptation of cultivars according to the local weather conditions and consumer preference. the objective was to evaluate the performance and acceptance, thereby detecting the consumer's preference for different carrot cultivars in organic cropping system. the performance of the cultivars nantes, shin kuroda and danvers flaker was evaluated in the winter season and cultivars shin kuroda, kuronan, brasilia, esplanada and carandaí for cultivation of summer in dois vizinhos, paraná state, brazil. the experimental design was randomized blocks with five replications and four treatments for the winter season and five treatments for the summer season. we analyzed the resistance to leaf blight (alternaria dauci), incidence of green shoulder, total soluble solids, yield and acceptability through sensory analysis of fresh carrots and canned pickles type. on the winter crop, cultivar nantes resulted in higher yield (29.02 t ha-1) and on the summer crop cultivar esplanada productivity was higher (32.0 t ha-1) without statistical difference. the cv. esplanada was more resistant to leaf blight and presented the lowest percentage (5.6%) of green shoulder. for sensory analysis, the cvs presented good acceptability from the participating consumers.
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