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Florescimento e frutifica??o de mangueira (Mangifera indica L.) Cv. Rosa promovidos por diferentes doses de paclobutrazol
Cardoso, Maria Gerolina Silva;S?o José, Abel Rebou?as;Viana, Anselmo Eloy Silveira;Matsumoto, Sylvana Naomi;Rebou?as, Tiyoko Nair Hojo;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000200004
Abstract: efficient techniques as the floral induction allow the establishment of commercialization strategies for favorable periods of market and economical success in the cultivation of mango fruits. an experiment, was conducted in order to study the effect of different paclobutrazol doses (pbz) on the flowering and production of mango fruits cv. rosa. the experiment design used was formed by randomized blocks with four treatments with five replications. the treatments were composed of: t1-control (only water); t2- pbz- 0,40g a.i./m canopy; t3- pbz- 0,80g a.i./m canopy; and t4. pbz- 1,20g a.i./m canopy. the evaluation consisted of the following characteristics: flowering anticipation, number and fruits production per plant. the obtained results were submitted to regression analysis and dunnet test. it was observed a higher percentage of flowering and fruit production for t2 (0,40g) t3 (0,80g) and t4 (1,2g) in comparison to the control. the pbz treatment also anticipated flower initiation and fruit harvest, what means production out of season higher prices and more profitability.
Paclobutrazol no florescimento e na produ??o da mangueira 'Tommy Atkins'
Fonseca, Nelson;Castro Neto, Manoel Teixeira de;Ledo, Carlos Alberto da Silva;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000400012
Abstract: efficient techniques for controlling the production time are important for the economical success in the mango cultivation. in this study, it was evaluated the flowering and production of mango fruit, variety tommy atkins, in response to the paclobutrazol application (pbz), either in the soil (2 ml of the active ingredient per plant), or on foliage at different doses (0.5, 1, 1.5 and 2 ml of a.i. per plant in single or two applications), under conditions of irrigated cultivation, in the semi-arid area of northeastern of brazil. the studied variables were percentile flowering, number of fruits, and production per plant, being appraised in three times after the application of the growth regulator (68 to 110, 131 to 179 and 190 to 216 days after, for the flowering of the plant; and 162 to 203, 256 to 287 and 327 to 337 days after, for the number and production of fruits for plant). the application of pbz in the soil determined percentile of flowering, number of fruits and production for plant superiors to the control (water to foliage) and to the treatments with pbz to foliage, besides anticipating the flowering of the plants. pbz to foliage, independent of the application number and used doses, didn't overcome the control significantly. applied pbz in the soil anticipated the flowering in 23 days, in relation to the control and to the treatments with pbz to foliage, in the second evaluation time.
Utiliza??o do paclobutrazol, ethephon e nitrato de potássio na indu??o floral da mangueira no semi-árido nordestino
Mendon?a, Vander;Ramos, José Darlan;Menezes, Josivan Barbosa;Innecco, Renato;Pio, Rafael;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000600012
Abstract: an experiment was conducted in order to verify the effect of different concentrations of paclobutrazol, ethephon and potassium nitrate in the production of mango cv. tommy atkins at agricultural area of mossoró-assu. the experiment was carried out in 1999, under an experimental design of randomized blocks, with an factorial arrangement of 3x2x3 (dose of paclobutrazol: 0 mg.l-1; 1000 mg.l-1 and 1500 mg.l-1); 2 (potassium nitrate concentrations: 3 and 4%); 3 (dose of ethephon: 0,0 ml.l-1; 0,50 ml.l- and 1,0 ml.l-) with four replicates. the dosage of 1500 mg.l-1 of paclobutrazol caused the largest reduction of plants growth. this product showed good growth inhibition characteristics. the kno3 and ethephon, separately, did not influence none of the evaluated characteristics.
Paclobutrazol e estresse hídrico no florescimento e produ??o da mangueira (Mangifera indica) 'Tommy Atkins'
Fonseca, Nelson;Castro Neto, Manoel Teixeira de;Ledo, Carlos Alberto da Silva;
Revista Brasileira de Fruticultura , 2005, DOI: 10.1590/S0100-29452005000100008
Abstract: the use of growth regulators and water stress are important practices for the induction of flowering and production of mango in tropical areas. flowering and fruit production of mango trees cv. tommy atkins were evaluated in semi-arid area of northeast brazil, in response to paclobutrazol applications (pbz) to the soil (2 ml of a.i./plant), under irrigation, and to the leaves in different doses (0.5 and 1 ml of a.i. in one applicaqtion and split into two fractions), without irrigation, besides the control (one foliar application of water followed by water stress). the variables were evaluated in three different times after the application of pbz (68 to 91, 131 to 179 and 190 to 216 days to the percentage of flowering per plant; and 180 to 203, 267 to 287 and 299 to 337 days to the number of fruits and production per plant. results indicated that the water stress imposed to the plants without pbz applications was as efficient in flowering induction and fruit production of mango trees as were the applications of pbz to the soil, using irrigation, and to leaves, without irrigation. the second evaluation time was superior to the first and third times in flowering and production per plant. the pbz application in soil advanced in 23 days the flowering of plant in the second time in relation to the application of water stress. the work proposes that the water stress has potential to flowering induction and may replace the stress caused by pbz application in mango trees under tropical semi-arid conditions.
Influência do paclobutrazol e da temperatura ambiente sobre o florescimento e frutifica??o da limeira ácida 'Tahiti'
Cruz, Maria do Céu Monteiro da;Siqueira, Dalmo Lopes de;Salom?o, Luiz Carlos Chamhum;Cecon, Paulo Roberto;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000400017
Abstract: the growth retardant paclobutrazol (pbz) was applied on the acid lime 'tahiti's cultivated in pots in a growth chamber under controlled temperature of 28 oc day/ 18 oc night, and photoperiod of 16 hours of light, with photosynthetic photons flow (ppf) of about 170 μmol m-2 s-1on grafted on the lemon tree 'cravo', coming from two temperature conditions (25 oc day/ 20 oc night) and (36 oc the maximum average and 16 oc the minimum average ones). after 30 days the application of pbz, when plants from greenhouse were in the middle of flowering, it was evaluated the number of shooting, number and flowers and, later on, the number of fruits per plant. the pbz application increased the flowering and fructification in the plants submitted to the conditions of low temperatures. in those plants the pbz increased the number of fruits due to the high flowering. however the pbz was not effective in the induction of flowering on the acid lime 'tahiti' under the conditions of temperature of 25 oc day and 20 oc night.
Influence of Paclobutrazol and Ethephon on Vegetative Growth of Guava (Psidium guajava L.) Plants at Different Spacing  [cached]
Jaswinder Singh BRAR
Notulae Scientia Biologicae , 2010,
Abstract: To ascertain the growth retarding potential of Paclobutrazol (PBZ) and Ethephon on guava plants at different spacing viz 6×2 m, 6×3 m, 6×4 m and 6×5 m; both were applied at 500 ppm, 1000 ppm as a foliar spray. Investigation revealed that all treatments influence the vegetative growth of plants compared to untreated plants at all spacing levels. However, paclobutrazol considerably restrict the overall vegetative growth of trees. Stock and scion girth was found to be increased with ethephon treatments. The tree height and E-W tree spread was found to increased with increasing plant density. Similarly, trunk girth in terms of stock and scion girth was also increased with increase in plant spacing. Although, the PBZ 500 ppm markedly restrict the plant growth but it may be further investigated for managing the guava tree canopies under high density planting systems, taking the fruit quality and economic aspects into consideration.
Combina o do paclobutrazol, sulfato de potássio e etefon na indu o floral da mangueira cv. Tommy Atkins  [PDF]
José Algaci Lopes da Silva,Josynaria Araújo Neves
Comunicata Scientiae , 2011,
Abstract: Amongst the techniques used for the regulation of the vegetative growth of mango trees withthe purpose in floral induction, is common the arranged use of the substances Paclobutrazol,Potassium Sulfate and Ethephon. Under conditions of semi-arid tropic the precipitated techniquehas persuaded an abundant flower induction, however has produced inconsistent effects in theconditions of warm and rainy climate. With the purpose to study that combination in the growth eflowering of mango trees, variety Tommy Atkins, it was experimented in the mesorgion of TeresinaCity, State of Piauí, under conditions of humid tropic, using an experimental design of randomizedcomplete blocks, with an factorial arrangement 4 x 3: four Paclobutrazol doses (zero; 0.7; 1.0 and 1.3g of a.i. m-1 of diameter tree canopy) and three practices that combined applications of PotassiumSulfate (2%), Ethephon (240 ppm) on three periods of floral induction, 90, 105 and 120 days, to thestart of application of dormancy-breaking, which was counted from the Paclobutrazol application.Plants untreated produced only vegetative branches and the various products and periods ofapplications combinations tested showed low rates flowering and high rates of dormant buds.
Influênciado ethephoncom e sem uréia no florescimento de plantas de abacaxi (Ananas comosus (L.) Merrill 'Cayenne') Influence of ethephon and urea on the flowering of pineapple (Ananas comosus (L.) Merril 'Cayenne')
J.I. Fahl,M.L.C. Carelli,J.F. Franco
Planta Daninha , 1981, DOI: 10.1590/s0100-83581981000200003
Abstract: Foram estudados os efeitos de ethephon, com e sem uréia no controle do florescimento de abacaxizeiro 'Cayenne". Foram utilizadas as concentra es de 475 e 950 ppm de ethephon, e essas mesmas doses em combina o com uréia a 2%, em pulveriza o sobre toda a planta. Verificou-se que 60 dias após os tratamentos, a porcentagem de inflorescências emergidas das plantas das parcelas que receberam 950 ppm de ethephon foi significativamente maior do que as que receberam 475 ppm; por outro lado, essa dose quando acrescida de uréia foi superior à de 950 ppm isolada. Entretanto, a concentra o de 950 ppm de ethephon adicionado de uréia foi o melhor tratamento, apresentando mais de 50% de inflorescéncias emergidas, enquanto que a testemunha permaneceu em estádio vegetativo. Aos 116 dias da aplica o, todas as plantas apresentaram inflorescências emergidas excetuando-se as plantas testemunhas, das quais apenas 4,6% atingiram esse estádio de desenvolvimento. A adi o de uréia ao ethephon aumentou significativamente a eficiência deste produto em antecipar o florescimento. O tempo necessário para se obt er ce rca de 100% de inflorescências emergidas foi 74, 95, 95 e 116 dias após a aplica o, respectivamente para os tratamentos de 950 ppm de ethephon + uréia a 2%, 950 ppm de ethephon, 475 ppm de ethephon + uréia a 2% e 475 ppm de ethephon. The effects of ethephon, applied at concentrations of 475 and 950 ppm alone or with urea at 2%, on the flowering of pineapple, were studied in a field experiment. At 60 days after appl ication, the treatment with 950 ppm of ethephon alone showed higher percentage of emerged inflorescences than that with 475 ppm, but this concentrations plus urea was superior than 950 ppm alone. The highest number of inflorescences, over 50%, was achieved with 950 ppm of ethephon plus urea, while the check remained in vegetative stage. At 116 days after application, all plants showed emerged inflorescences except in the check where only 4,6% reached that stage. The addition of urea to ethephon enhanced sig ni fi cative ly the efi ciency of this product in anticipate flowering. The time necessary to obtain 100% of emerged inflorescence were 74, 95, 95 e 116 days after application for 950 ppm of ethephon + urea at 2%, 950 ppm of ethephon, 475 ppm of ethephon + urea at 2% and 475 ppm of ethephon, respectively.
Efeito do paclobutrazol em duas épocas de produ??o da mangueira
Mouco, Maria Aparecida do Carmo;Albuquerque, Jo?o Ant?nio Silva;
Bragantia , 2005, DOI: 10.1590/S0006-87052005000200008
Abstract: the growth regulators have been used as a practice to alter the mango phenologic cycle in order to forecast the harvest. with the aim to define doses and paclobutrazol (pbz) application forms, an experiment was carried out in itaberaba, state of bahia, brazil. two ways of application were tested, via soil and foliar, and two different paclobutrazol doses. it was found that pbz via soil, promotes flowering in mango trees in any season of the year, under tropical semi-arid conditions, but its efficiency are related to the maximum and minimum air temperatures at the time of bud break. the results showed that pbz is inefficient when applied via foliar.
Florescimento de tangerineiras satsuma 'Owari' tratadas com paclobutrazol, anelamento do caule e baixa temperatura
Siqueira, Dalmo Lopes de;Barcena, José Luis Guardiola;Esposti, Marlon Dutra Degli;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000300009
Abstract: the growth retardant paclobutrazol (pbz) and stem girdling were applied to satsuma 'owari' mandarin plants cultivated in pots in a growth chamber under two different environmental conditions: one with temperature at day time set in 150c and night time in 80c, and another with temperature at day time set in 260c and night time in 20 0c. the low temperature (15/8oc) significantly increased flowering, but pbz was not effective. the flowering increased when the plants were girdled, mainly in the conditions of low temperatures (15/8oc). paclobutrazol and the girdling induced variations in carbohydrates concentrations of leaf and root, however it was not possible to establish a relationship between flowering and carbohydrates level in the plant.
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