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Search Results: 1 - 10 of 18739 matches for " Flávio Marcos Juqueira;Zamperlini "
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Eficiências Reprodutiva e Produtiva em Vacas das Ra?as Gir, Holandês e Cruzadas Holandês x Zebu
Guimar?es, José Domingos;Alves, Nadja Gomes;Costa, Eduardo Paulino da;Silva, Márcio Ribeiro;Costa, Flávio Marcos Juqueira;Zamperlini, Belmiro;
Revista Brasileira de Zootecnia , 2002, DOI: 10.1590/S1516-35982002000300014
Abstract: to evaluate the reproductive efficiency and its relationship with productive traits and genetic composition of a herd, in tropical climate, 113 cows were ssigned to seven crossbreeding levels: 1/2, 3/4, 7/8, 9/16 and 15/16 holstein x zebu, crossbreed pure holstein and gir. the studied traits were: age at calving, calving season, interval from calving to first service, interval from first service to fertile service, number of services, service period, interval calving, reproductive efficiency, lactation period, milk production by lactation order and genetic groups of the herd. analyses of multiple regression, variance and comparison of averages using tukey test were performed in statistical software saeg. the reproductive efficiency was influenced by the age at calving, lactation period, calving interval and genetic composition of the cows, but it was not influenced by milk production and season. the productive indexes were not influenced by the calving season, but were influenced by the genetic composition of the animals. in this study, the reproductive indexes were satisfactory, the zebu cows presented the smallest productive indexes and the taurine ones the smallest reproductive efficiency, probably by larger sensibility to handling.
Atividade Ovariana em Fêmeas Bovinas da Ra?a Holandesa e Mesti?as Holandês x Zebu, Durante Dois Ciclos Estrais Normais Consecutivos
Alves, Nadja Gomes;Costa, Eduardo Paulino da;Guimar?es, José Domingos;Silva, Márcio Ribeiro;Zamperlini, Belmiro;Costa, Flávio Marcos Juqueira;Santos, Anselmo Domingos Ferreira;Miranda Neto, Tamires;
Revista Brasileira de Zootecnia , 2002, DOI: 10.1590/S1516-35982002000300012
Abstract: to verify the ovarian activity in respect to follicular dynamics and corpus luteum activity, 25 cows distributed in five experimental groups according to the crossbreeding level as: group 1: 1/2 holstein x zebu, group 2: 3/4 holstein x zebu, group 3: 15/16 holstein x zebu, group 4: crossbreed pure holstein and group 5: 7/8 holstein x zebu, were daily monitored by ultrasonography examination during two estrous cycle after the second postpartum cycle. the average in days for the interovulatory period were respectively, for the first and second cycles: 21.76±3.33 and 21.94 ± 2.90. there was no difference between these values. the average for the interovulatory period between cycles was 22,08±2,46 days. in this experiment, the development of one (16%), two (78%) and three (16%) follicular waves was verified, with predominance of two follicular waves. the interovulatory period in three waves cycles (25.33±4.36 days) was longer when compared to one (16.0±3.6 days) and two (21.69±1.97 days) waves cycles. the follicular waves average length were: 11.0±3.69, 7.17±1.60 and 8.5±1.52 days, respectively, for the first, second and third follicular waves. in estrous cycles where only two waves occurred, the waves average length were: 11.15±1.65 and 12.07±2.82 days. the highest progesterone concentrations in the first and second estrous cycle were, respectively, in the 13.6±3.0 (7.29±4.3 ng/ml) and 11.8±3.4 (5.6±2.0 ng/ml) days and were not different among experimental groups and estrous cycle. after the analyses, it was concluded that the different experimental groups presented the same follicular dynamics behavior, and despite the differences in absolute numbers in progesterone concentration among the groups, they were indicative of normal luteal activity.
Fator de resposta da produ??o do cafeeiro ao deficit hídrico em Campinas
Arruda, Flávio Bussmeyer;Grande, Marcos Alexandre;
Bragantia , 2003, DOI: 10.1590/S0006-87052003000100017
Abstract: coffee yield response to available water is a major factor on yield prediction and irrigation feasibility. in this way, results of irrigated (yi) and non irrigated (yni) yields of a 16-year field experiment with coffee plants carried out in campinas, state of s?o paulo, brazil, were analyzed as relative differences of (yi-yni)/yi and correlated to the relative difference of actual evapotranspiration, (etri-etrni)/etri. by suppressing each month of the year in that correlation, it was observed that water deficit occurred in april, may, june and july were important to yield analysis. it was possible to adjust the sensitivity coefficient (ky) or the yield response factor to water deficit, as recommended by fao. the annual yield response factor (ky) showed a linear relation to plant age indicating an increase of plant sensitivity to water stress along the years.
Evapotranspiration and crop coefficient of cucumber in greenhouse
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2003, DOI: 10.1590/S1415-43662003000200017
Abstract: the evapotranspiration (etc) and crop coefficient (kc) of cucumber in a greenhouse were determined during the winter-spring season in piracicaba, sp, brazil. crop was irrigated with water of three different levels of salinity: s1 = 1.5, s2 = 3.1 and s3 = 5.2 ds m-1. electrical conductivity of s1 was obtained only by addition of fertilizers, as fertigation was used, and the s2 and s3 levels in addition to fertilizers received magnesium sulphate, calcium chloride and sodium chloride. cucumber seedlings, cv. hokushin, were grafted on squash, transplanted on beds in double rows and directed vertically with a single stem. irrigation was performed when soil matric potential reached -30 kpa, which was determined by the mean matric potential at 0.15 and 0.30 m depths, and the depth of irrigation was calculated from a reduced-evaporation pan. a randomized block design was adopted with three replications. the etc and kc were found to reduce linearly by the salinity of the irrigation water with reduction in etc of 4.6% for unit increase of salinity. due to the reduced evapotranspiration in saline treatments, deep percolation was increased by saline water and corresponded to 4, 7 and 17% of the total applied water in s1, s2 and s3, respectively. measured kc values for s1 were very close to the estimated values thus the combined use of tensiometers and evaporation pan was found to be adequate for irrigation management in greenhouse.
Doses de N e K no tomateiro sob estresse salino: III. Produ??o e qualidade de frutos
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2008, DOI: 10.1590/S1415-43662008000200003
Abstract: the application of high doses of fertilizers could increase the tolerance of crops to salts by reducing the nutritional imbalance caused by salinity. in order to test this hypothesis, a study was conducted to evaluate the production and quality of tomato fruits, hybrid facundo, irrigated with saline water, under different doses of n and k. the work was conducted in a greenhouse and the treatments were composed of the combination of three levels of n (7.5, 15.0 and 22.5 g per plant of n) and three levels of k (8, 16 and 24 g per plant of k2o) applied through drip fertigation, in the 3 x 3 factorial design, with five replications. also the salts sodium chloride and calcium chloride were also added to irrigation water for obtaining an electrical conductivity of the irrigation water of 9.5 ds m-1. effects of the treatments were not verified on the production components (yield, size and mean weight of fruits) nor on some parameters of the quality of the fruits (concentration of nutrients, soluble solids and titratable acidity), the concentration of k increased and the ratio na/k reduced in the fruits with increasing dose of k. it was concluded that the application of high doses of n and k did not contribute to the increase the tolerance of tomato to salinity.
Doses de N e K no tomateiro sob estresse salino: II. Crescimento e parti??o de matéria seca
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2008, DOI: 10.1590/S1415-43662008000100005
Abstract: the presence of certain nutrients in soil solution can stimulate the growth of plants when cultivated under saline stress. a study was conducted to evaluate the response of tomato (hybrid facundo) to different doses of n and k under irrigation with saline water. the work was carried out in a greenhouse and the treatments consisted of the combination of three levels of n (7.5, 15.0 and 22.5 g per plant) and three levels of k (8, 16 and 24 g k2o per plant) applied by drip fertigation, in a 3 x 3 factorial scheme, with five replications. the salts sodium chloride and calcium chloride were also added to irrigation water for obtaining an electrical conductivity of the water of 9.5 ds m-1. plant height, stem diameter, leaf area and the number of days for flowering were not affected by the levels of n and k, the levels of k affected the dry mass of stem plus clusters and total dry mass for the lowest levels of n. it was concluded that the application of high doses of n and k did not contribute to increase salt tolerance of tomato.
Evaluation of evaporation-measuring equipments for estimating evapotranspiration within a greenhouse
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2004, DOI: 10.1590/S1415-43662004000200004
Abstract: with the objective of evaluating the performance of simple evaporation measuring equipments in estimating the evapotranspiration in greenhouse, an experiment was conducted in piracicaba, sp, during a tomato-growing season. daily water evaporation rate from piche atmometer, modified atmometer and a reduced evaporation pan installed inside the greenhouse and a class a pan installed outside were compared to the evapotranspiration rates calculated with penman-monteith equation. results showed that atmometers had the best performance in estimating the crop evapotranspiration in greenhouse and could be used advantageously in relation to the evaporation pans.
Manejo da água e nutrientes para o pepino em ambiente protegido sob fertirriga??o
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2002, DOI: 10.1590/S1415-43662002000200012
Abstract: fertigation is a practice that has been widely used in drip irrigated areas and in greenhouses. it is indispensable to maximize the benefits of the cropping system. in this study, results from a cucumber cultivation in a greenhouse, following a preset fertigation scheduling and a combined method for irrigation management are presented. marketable crop yield was over 110 mg ha-1 and 76 fruits m-2, which is much higher than that obtained by growers of this state and else where in brazil. the management of fertigation adapted indicated that the same could be used as a reference for future cultivation under greenhouse conditions.
Recupera??o de um solo salinizado após cultivo em ambiente protegido
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2001, DOI: 10.1590/S1415-43662001000100014
Abstract: overapplication of fertilizers and inadequate irrigation management in greenhouse crops have caused soil salinization, resulting in reduction of crop yields. the aim of this work was to evaluate different depths of leaching and methods of application for reclamation of a salinized soil under greenhouse conditions. three relative water depths (2/3, 1, 3/2), based on calculated leaching water depth, were applied by drip irrigation and flooding, in a 2 x 3 factorial scheme, with 3 replications. from the obtained results, it may be concluded that the application by drip was more efficient than flooding in leaching the accumulated salts in the soil and the relative water depth and coefficient k of 0.9 and 0.1 for drip and 1.3 and 0.2 for flooding, respectively, should be used.
Salt accumulation and distribution in a greenhouse soil as affected by salinity of irrigation water and leaching management
Blanco, Flávio F.;Folegatti, Marcos V.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2002, DOI: 10.1590/S1415-43662002000300006
Abstract: the effects of irrigation water salinity, leaching fraction and its frequency of application on soil salinization were studied. three water salinities (s1=1.54, s2=3.10 and s3=5.20 ds m-1) and two irrigation water depths associated with their application frequencies (w1=1.00 etc; w2f1=1.25 etc in all irrigations and w2f2=1.25 etc when the irrigation water depth of w1 reached 100 mm where etc is the crop evapotranspiration), were applied during the growing period of a grafted-cucumber crop in a greenhouse. the experimental design consisted of randomized blocks of 3 x 3 factorial scheme with 3 replications. soil salinity at 0.1, 0.3 and 0.5 m depths increased linearly with salinity levels of water and the leaching fraction did not have any effect regardless of its management. salt concentration was higher near the soil surface and between the adjacent drippers.
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