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Search Results: 1 - 10 of 19155 matches for " oryza sativa l. "
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Fertilization with Nitrogen, Phosphorus and Potassium in Upland Rice Cultivars in the Southern Region of Rond?nia, Brazil  [PDF]
Edimar Rodrigues Soares, Robertt Fernandes, Laércio da Silva Londero, Leandro Galon, Fabiana Ferreira Pires, Marcelo de Andrade Barbosa, Diego Lopes dos Santos, Samara Cristina Sampaio Correa, Everton Augusto Sampaio Correa, Remy Carvalho dos Santos
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.614229
Abstract: The upland rice productivity in the state of Rond?nia is still low, in view of the potential of culture. The use of cultivars adapted to different regions and more responsive to fertilizer employed is an essential practice which can change that. The aim of this study was to evaluate the agronomic characteristics and productivity of two upland rice cultivars with nitrogen, phosphorus and potassium (N-P-K) doses in two municipalities in the southern state of Rondonia region. The experimental design was a randomized block design with four replications in a factorial 2 × 2 × 5, with the first factor composed of two cultivars (hybrid Ecco and conventional farming AN Cambará), the second factor, the environment of the two municipalities, Cerejeiras and Vilhena and the third factor of five doses of N-P-K (0-0-0, 30-40-30, 60-60-60, 90-90-90 and 120-100-120 kg·ha-1). The characteristics evaluated were: tillering, number of integers and sterile grains per panicle, weight of 1000 grains, grain yield (kg·ha-1) and whole grain yield. There was no triple interaction between the three factors for any of the traits. The hybrid Ecco has higher tillering ability than AN Cambara and presents fewer sterile grains per panicle, heavier 1000 grains and hence greater productivity. For both cultivars, the highest yields are obtained with a dose of 120-100-120 kg·ha-1 N-P-K. For the Ecco, the productivity is achieved with this dose and the dose of 90-90-90 kg·ha-1 is statistically similar. There is no difference in productivity between the municipalities when the dose of N-P-K is less than 60-60-60 kg·ha-1. The highest yield of whole grains in function of N-P-K fertilization is obtained in Cerejeiras.
Physiological Performance of Rice Seeds Treated to Thiamethoxam and Placed under Storage  [PDF]
Andreia da Siva Almeida, Cristiane Deuner, Carolina Terra Borges, Adilson Jauer, Geri Eduardo Meneghello, Lilian Madruga de Tunes, Francisco Amaral Villela, Paulo Dejalma Zimmer
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.526396
Abstract: High-yielding crops can only achieve their potential when the appropriate technological tools are applied and weather conditions do not impose restrictions. One such technological tool is the treatment of seeds, in which different products are used and, in some cases, cause little-known effects capable of modifying the plant’s metabolism and/or its morphology. The insecticide thiamethoxam alters the plant’s physiology and morphology, accelerating its development, thus enhancing its vigor. The objective of this study was to evaluate the influence of thiamethoxam on the physiological performance of rice seeds during storage. The research was conducted in a green-house and at the laboratory of the Department of Plant Science, Faculty of Agronomy Eliseu Maciel —UFPel (Federal University of Pelotas). Rice seeds from cultivars INIA Olimar and El Paso L144 were treated to a commercial product containing 350 grams of active ingredient thiamethoxam at doses of 0, 100, 200, 300, 400 and 500 g per 100 kg of seed. Seeds were tested for physiological quality immediately after being treated (check treatment) and at 3, 6, 9 and 12 months under storage, through germination test, cold test, accelerated aging and greenhouse emergence test. The concentration range from 200 to 400 g a.i. 100 kg-1 seed yielded the highest germination and seed vigor values for both rice cultivars during the storage period.
Hybrid Rice Seed Treatment with Pesticides Improves Its Physiological Quality and Performance  [PDF]
Andréia da Silva Almeida, César Iván Suárez Castellanos, Cristiane Deuner, Adilson Jauer, Thais Ongaratto de Camargo, Cristian Troyjack, Geri Eduardo Meneglhelo, Francisco Amaral Villela, Paulo Dejalma Zimmer, Lilian Madruga de Tunes
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.614243
Abstract: Pathogens in the soil or transmitted by seeds can reduce the stand of plants, affecting the yield of the crop. Furthermore, in the case of rice, the low temperature is a limiting factor in culture. The treatment of seeds with insecticides is an alternative to reduce the damage caused by pests incidents during the early stages of plant development and in some cases, may assist in the germination of seeds exposed to low temperatures. In this sense, the objective of this study was to evaluate the influence of seed treatment with insecticides in the physiological quality and yield of hybrid rice seeds, cv. Inov CL. For this, three experiments were conducted with treated seeds in different doses of thiamethoxam + lambda-cyhalothrin and fipronil totaling seven treatments, including the control (no product). In the first experiment, it was determined seed germination to 10°C, 13°C, 16°C, 20°C and 25°C. In the second experiment, it was assessed seed vigor through accelerated aging, cold test and emergency field. The third experiment was carried out into the field to observe the number of panicles m-2 and crop yield. It is concluded that treatment of hybrid rice seeds, cv. Inov CL with thiamethoxam + lambda-cyhalothrin and fipronil increases the germination percentage of seed and early seedling performance. Treatment of hybrid rice seeds, cv. Inov CL with thiamethoxam + lambda-cyhalothrin provides greater germination and early seedling performance compared to treatment with fipronil. Treatment of hybrid rice seeds, cv. Inov CL with thiamethoxam + lambda-cyhalothrin in dosages of 500 mL 100 kg-11 of seeds or 500 mL 45 kg-1 of seeds increases grain yield.
Phytosociology and Floristic Composition of the Infesting Community in Rice Crop Waterlogged  [PDF]
Bruna Penha Costa, Maria Rosangela Malheiros Silva, Carlos Augusto Rocha de Moraes Rego, Juan López de Herrera, Maria Soraia Fortado Vera Cruz, Ana Carolina Pinguelli Ristau, Marinez Carpiski Sampaio, Thatiane Nepomuceno Alves, Shirlene Souza Oliveira, Hannah Braz, Nitalo Andre Farias Machado
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.93028
Abstract: The objective of this study is to identify and quantify the floristic composition of the weed community in the rice crop waterlogged in the municipality of Arari-MA. The botanical material was obtained in three areas by randomly a hollow rectangle of 0.50 m × 0.30 m by forty five times in each plot. The aerial parts of weeds were harvested, identified, counted and oven dried with forced air ventilation at 333.15 K to 343.15 K. These data were used to determine the phytosociological parameters and the Shannon-Wiener diversity index was also calculated. A total of 6607 plants were collected, being 4115 (62.28%) in the vegetative phase and 2492 (37.72%) in the reproductive phase. The monocotyledonous group obtained the largest number of plants, 2882 in the vegetative phase and 1535 in the reproductive phase. The Cyperaceae family recorded nine species and four genera and the Poaceae, seven and four species in the vegetative and reproductive phases, respectively. The species of higher IVI in the vegetative phase was E. sellowiana in the area A1 with 82.86%, and in the reproductive
Harvest Residue Study of Fungicide Tebuconazole Ec Formulation in Groundnut and Paddy  [PDF]
Chiranjit Kundu, Arnab Goon, Anjan Bhattacharyya
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.24048
Abstract: A field trial was conducted under West Bengal condition during July 2009 to October 2009 to evaluate the harvest residue of Tebuconazole (25.9% EC) in paddy at two application rates (750 and 1500 mL ha–1). Another field trial was conducted during August 2009 to December 2009 to evaluate the harvest residue of the same molecule in groundnut. The quantitative analysis of the fungicide residue was performed using Liquid Chromatography-Mass Spectrometry (LC-MS/M S). The average recovery was found in between 86.33 to 91.87% for different substrates of groundnut. In case of paddy the average recovery was ranges in between 86.40 to 90.86% for different substrates. In all the cases, it was found that the fungicide residues were below the detection limit of the instrument (<0.01 ppm) irrespective of doses in different substrates of paddy and groundnut. Based on these findings, the use of Tebuconazole in paddy and ground-nut may be advocated for the control of diseases in paddy and groundnut without any residual toxicity problem.
Agronomic Performance of Cultivars of Upland Rice in the Southern of the Region of Rondônia, Brazil  [PDF]
Edimar Rodrigues Soares, Robertt Fernandes, Laercio da Silva Londero, Diego Lopes dos Santos, Samara Cristina Sampaio Corrêa, Everton Augusto Sampaio Corrêa, Remy Carvalho dos Santos, Ariel Pereira Gomes, Leandro Galon, Fabiana Ferreira Pires, Rosilene da Silva Gon?alves
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.56053
Abstract:


The upland rice is grown in most Brazilian states. However, in many of them the yield obtained is low. The choice of cultivar more suited to a particular environment can contribute to increased productivity of this crop. This research aimed to evaluate the performance of a hybrid cultivar of upland rice (Ecco) and five conventional cultivars (BRS Monarca, BRS Primavera, AN Cambará, BRS Sertaneja and BRS MG Curinga) in two environments (Vilhena and Cerejeiras). The tests were conducted in the agricultural year 2010/2011. We evaluated the following characteristics: tillering, panicle number per unit area, number of filled grains per panicle sterile, mass of grains per panicle, 1000 grain weight, grain yield (kg·ha-1) and whole grain yield. There was no cultivar x environment interaction for all traits. Greater tillering, higher panicle number per area, higher productivity and yield of whole grains in the municipality of Cerejeiras were observed, while the highest number of sterile grains per panicle was obtained in Vilhena. The hybrid Ecco highlighted in relation to all other cultivars is in relation to tillering, panicle number per area and grain yield. The municipality of Cerejeiras is the most suitable for the cultivation of upland rice.


Expression of the Genes OsNRT1.1, OsNRT2.1, OsNRT2.2, and Kinetics of Nitrate Uptake in Genetically Contrasting Rice Varieties  [PDF]
Osmário J. L. Araújo, Milena S. Pinto, Marcus V. L. Sperandio, Leandro A. Santos, Elvia M. L. M. Stark, Manlio S. Fernandes, André Marques dos Santos, Sonia Regina de Souza
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.62035
Abstract: Four genetically contrasting rice varieties (IAC-47, Bico Ganga, Arroz de Revenda and Manteiga) according to Random Amplified Polymorphic DNA (RAPD) analysis were assessed regarding expression of the genes OsNRT1.1, OsNRT2.1 and OsNRT2.2 and the nitrate uptake kinetics parameters (Km and Vmax). Up to 250-fold increases in the induction of gene expression after nitrate resupply were observed for the high-affinity transporter (OsNRT2.1 and OsNRT2.2). However, no significant variations in Vmax among the varieties were obtained. The lower value of Km of the IAC-47 cultivar in relation to the Arroz de Revenda variety suggests a greater role of high-affinity transporter genes. These results indicate that closer attention should be paid to the expression levels of these genes in selecting varieties aiming to enhance nitrogen uptake efficiency.
Variability and Synchronism of Leaf Appearance and Leaf Elongation Rates of Eleven Contrasting Rice Genotypes  [PDF]
Rohilyn B. Egle, Abigail J. Domingo, Crisanta Bueno, Antonio C. Laurena, Edna A. Aguilar, Pompe Sta. Cruz, Benoit Clerget
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.610116
Abstract: Leaf appearance and leaf elongation rates in rice play an essential role in determining the development of the plants’ architecture which affects their adaptability to varying environments. This study aimed to characterize the rates of leaf appearance and elongation on all leaves of the main culms of rice plants for 11 contrasting varieties and to determine if the decrease in the leaf appearance rate was related to a simultaneous decrease in the rate of leaf elongation. Forty four 13-L pots were sown with one plant from one genotype and laid out in 4 randomized complete blocks. The experiment, conducted inside a greenhouse, was repeated twice. The increase in length of the leaves expanding on the main stems was monitored daily until flag leaf. Data were used to estimate the rates of leaf appearance and leaf elongation. Significant variability in the rate of leaf appearance, rate of leaf elongation, and leaf length was found across varieties. The kinetics of leaf appearance had linear phases intermediated by a curvilinear phase, without sharp changes in the phyllochron duration. Maximal leaf elongation rate (LER) of all genotypes (except for one) increased linearly with leaf rank until it reached its maximum value at leaf 8 to 10 (11 - 12 for Azucena) where it stabilized before decreasing linearly with leaf rank for the last leaves. Finally, both rates of leaf appearance and leaf elongation evolved with time more smoothly than expected so no sharp decrease in LER occurred at the time of the decrease in leaf appearance rate of the last leaves. However, the trilinear model fits the data well enough to remain useful in efficiently comparing the leaf appearance kinetics of contrasting varieties.
Ambar - INIA, nuevo cultivar de arroz de grano corto y muy bajo contenido de amilosa Ambar-INIA, a new short grain rice cultivar with very low amylose content
José Roberto Alvarado A,Santiago Hernaiz L
Agricultura Técnica , 2005,
Abstract: Ambar-INIA is the first glutinous rice (Oryza sativa L.) cultivar released in Chile, with low amylose content (5%). Its was originated from germplasm donated by the Rice Millers Association to the Rice Breeding Program, of the National Agriculture Research Institute, Quilamapu Regional Research Center. It is a variety with short, round and opaque grain, a length/width ratio of 1.7; a semi-dwarf plant with erect leaves, later than the varieties currently in use. It has good industrial quality, low gelatinization temperature and good productivity when crop management is good.
Venezuela 21: Nueva variedad de arroz de riego
Acevedo,Marco; álvarez,Rosa; Torres,Orlando; Castrillo,Willian; Moreno,Orlando; Torrealba,Gelis; Reyes,Edicta; Navas,María; Delgado,Nelly; Salazar,Margelys; Torres,Edgar;
Agronomía Tropical , 2004,
Abstract: the agronomic behavior of the cultivar "venezuela 21", was evaluated during three consecutive cycles in the test urt's and commercial sowing in the principal rice production zones of venezuela. it is characterized by presenting excellent potencial yield in paddy grain (superior 7,5 t ha-1) in both cycles, wint tolerance to pest (piricularia) and excellent grain quality (entire grain superior to 60% and amylose superior to 30%). for all this reasons the elegibility of the variety "venezuela 21" was request, for the production and commerciazation of certified seed in the country.
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