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Search Results: 1 - 10 of 2216 matches for " Oryza sativa "
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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.
Exploring Variability: New Brazilian Varieties SCS119 Rubi and SCS120 Onix for the Specialty Rices Market  [PDF]
Ester Wickert, Moacir Antonio Schiocchet, José Alberto Noldin, Juliana Vieira Raimondi, Alexander de Andrade, Klaus Konrad Scheuermann, Rubens Marschalek, Gabriela Neves Martins, Eduardo Hickel, Domingos Savio Eberhardt, Ronaldir Knoblauch
Open Journal of Genetics (OJGen) , 2014, DOI: 10.4236/ojgen.2014.42016
Abstract:

“Specialty rices” is a common name for varieties that present uncommon grains with distinctive features as pericarp color, grain shape and size or aroma. Most of these rices are related to cultural traditions and ceremonies, but some have higher nutritionally value than white rice. Considering that today people are searching for foods that could help to improve and maintain health, specialty rices would also be considered in some way as functional food. As a specific market, the economic values of these grains are also higher than those of white rice. So, the new red rice variety SCS119 Rubi and the new black rice variety SCS120 Onix were developed in order to attend the specific and economically important specialty rices market, and should be consumed as a whole rice grain. Experimental tests performed with these varieties showed that they could be recommended to all rice-producing regions of Santa Catarina State, Brazil.

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.
Método de perfilhos únicos para estimar os danos causados pela queima-da-bainha nos componentes de produtividade do arroz
Araújo, Leila Garcês de;Prabhu, Anne Sitarama;Silva, Gisele Barata da;
Fitopatologia Brasileira , 2006, DOI: 10.1590/S0100-41582006000200014
Abstract: the effect of sheath blight on some yield components in irrigated rice (oryza sativa) was estimated utilizing single tillers as experimental units. artificial epidemics were induced by inoculating field with the inoculum of rhizoctonia solani previously multiplied on the rice grain and hull medium. the disease severity was assessed on seven somaclones of metica-1 in addition to the parent cultivar metica-1, considering lesion height of 50 tillers as a measure. the relationship between panicle length and sheath blight severity was linear and negative both for early precoces (r = -0.65 p<0.01 ) and medium maturing (r =-0.62 p<0.01) ones. the disease affected panicle length by 8.83% and 6.26%, and empty spikelets by 10.94% and 12.20% in early and medium maturing genotypes, respectively. the estimated mean damage in grain weight/panicle was greater than on the empty spikelets and panicle length of genotypes tested, being 32.75% for early maturing and 30.99% for late maturing ones. the single tillers method can be used to obtain precise estimates of the potential losses caused by sheath blight in different genotypes.
Períodos de interferência das plantas daninhas na cultura do arroz de terras altas. II - cultivar Caiapó
Silva, Maria Rosangela Malheiros;Durigan, Julio Cezar;
Bragantia , 2009, DOI: 10.1590/S0006-87052009000200011
Abstract: the experiments were carried out in two growing seasons (2003/04 and 2004/05) in an experimental area at s?o paulo state university - unesp, jaboticabal campus, to evaluate the weed interference periods on the upland caiapó rice variety. the experimental design was randomized blocks with 4 replicates and 16 treatments. the treatments consisted of increasing periods of control or coexistence after emergence of the culture: 0-10; 0-20; 0-30; 0-40; 0-50; 0-60; 0-70 days; 0-harvest. the predominant families were poaceae, asteraceae, amaranthaceae and malvaceae, and the main weeds present were cyperus rotundus l., cenchrus echinatus l., digitaria spp heist., echinochloa crus-galli (l.) p. beauv., brachiaria decumbens stapf., eleusine indica gaertn e alternanthera tenella colla for both years. the upland rice cultivar caiapó is to be kept free of weeds for 30 days after emergence.
Qualidade fisiológica de sementes de arroz submetidas à radia??o gama
Miranda, Helen Lúcia da Cruz;Bobrowski, Vera Lucia;Tillmann, Maria Angela André;Dode, Luciana Bicca;Meneghello, Geri Eduardo;
Ciência Rural , 2009, DOI: 10.1590/S0103-84782009005000061
Abstract: the objective of this research was to evaluate the effects of the gamma radiation (co60) on the physiological quality of rice seeds. the research was carried out through three tests; in the first test rice seeds were irradiated at dosages of 0; 1; 2.5 and 5gy, while for the second and third tests the seeds were subjected to accelerated aging before being irradiated. for the second test the seeds were divided into wet and dry and both groups subjected to accelerated aging previous to irradiation at dosages of 0; 1; 2.5 and 5gy. for the third test the seeds were dried after being subjected to accelerated aging, and then irradiated at dosages of 0, 10, 25 and 50gy. to assess the physiological effects of the gamma radiation, all seeds were tested for germination and their germination speed index recorded. seedling growth was graded through the measurement of the lengths of the first leaf and seminal root system and total seedling dry weight, across all tests. the enzymatic activity of acid phosphatase and alpha-amylase was measured on dry seeds from the second test. the results from all tests indicate that the applied gamma radiation dosages did not cause any changes to the physiological quality of rice seeds.
Aduba??o foliar com micronutrientes em arroz irrigado, em área sistematizada
Marchezan, Enio;Santos, Osmar Santos dos;Avila, Luis Antonio de;Silva, Ricardo Posser da;
Ciência Rural , 2001, DOI: 10.1590/S0103-84782001000600003
Abstract: the objective of this experiment was to evaluate the effect of micronutrient application on irrigated rice in an area previously leveled. the experiment was carried out during three years on a albalqualf soil in which the soil surface layer of about 30cm had been removed. npk fertilization was applied according to soil analysis. the experiment design was a randomized block with four replications. the "complete" treatment had the micronutrients boron (h3bo3), copper (cuso4), iron (feso4), manganese (mncl2), molybdenum (na2moo4) and zinc (znso4) and treatments in which each one of the micronutrients was omitted besides a check without micronutrients. in the 1996/97 growing season the following rates were applied as leaf spraying at tillering and begining of flowering differentiation stage: zn 70g ha-1, mn 70g ha-1, fe 40g ha-1, b 50g ha-1, cu 12,5g ha-1 and mo 4g ha-1. in the 1997/98 growing season the same solutions were used but only at tillering. in 1998/99 the micronutrients doses were altered to zn 35g ha-1, mn 35g ha-1, b 100g ha-1, cu 20g ha-1 and mo12g ha-1 at tillering growth stage and fe no longer was used. soil leveling decreased soil organic matter, macro and micronutrients except boron and increased aluminum levels in the soil. it was observed that leaf spraying application of micronutrients on leaves did not affect seed yield in any of the years in which the experiments were conducted
Efeitos do atraso na colheita e do período de armazenamento sobre o rendimento de gr?os inteiros de arroz de terras altas
Ribeiro, Gilson José Teixeira;Soares, Ant?nio Alves;Reis, Moisés de Souza;Cornélio, Vanda Maria de Oliveira;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000500008
Abstract: the present work was develop with a view to evaluating the effect of the delay of harvest on grain moisture and whole grain yield in the processing of 12 rice cultivars as well as the different storage periods upon the recovery of the percentage of whole grains of samples of rice (oryza sativa l.) harvested at 0, 7, 14, 21 and 28 days after maturation, respectively. grain samples were also stored determination of the yield of whole grains at 30, 60, 90, 120 and 150 days after harvest of each cultivar. the results showed that the highest yield of whole grains and obtained when harvest is performed with moisture around 20%, the cultivars caiapó and cnas 8983 tolerate delay in harvest without further damages to grain yield and the grains for over 90 days maintains of favors the yield of whole grains in processing.
Competi??o inicial entre Cyperus esculentus e arroz irrigado em condi??es de casa-de-vegeta??o
Erasmo, E. A. L.;Pinto, L. P.;Terra, M.;Didonet, J.;Peluzio, J. M.;
Planta Daninha , 2000, DOI: 10.1590/S0100-83582000000200012
Abstract: with the objective of evaluating the competitive effect of cyperus esculentus on the growth and production of the culture of irrigated rice, experiments were installed in green house, in the experimental station of the school of agronomy - unitins, in gurupi, state of tocantins, brazil. the statistical design used in the experiments was a factorial plot 5x4 with three replications, completely randomized. the treatments consisted of five periods of coexistence of the rice with cyperus esculentus (15, 25, 35, 45 and 60 days after the emergency - d.a.e, of the rice) and four densities of c. esculentus (0, 2, 4 and 8 tuber/pots) corresponding to 0; 71; 142 e 286 plants of cyperus/m2, respectively. in the end of each period the following parameters in the rice culture were appraised: dry matter of plants/pot; leaf area/plant; tiller/pot dry matter; tiller/pot number and height of plants. the results showed that the effect of the of c. esculentus, was more pronounced in the densities of four and eight tuber/pot, in the periods of coexistence of 45 and 60 d.a.e. the most affected parameter was the dry matter of plant/pot, as a result of the reduction of the tiller/pot number. the height of the plants of irrigated rice was not affected by the presence of the weed in any coexistence period.
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