Produtividade e qualidade de frutos de mamoeiro ‘sunrise solo’ em função de doses de nitrogênio e boro

The study aimed to evaluate the yield and fruit quality of papaya 'Sunrise Solo' as function of nitrogen and boron fertilization. The experiment had a randomized block design with four replications, two plants per plot with a single border. To make up the treatments, we used the experimental array Plan Puebla III, which set the rates for nitrogen (0.0 to 111.2 - 200 - 288.9 - 400 g plant(-1), and B (0.0 - 0.83 - 1.5 - 2.16 - 3.0 g plant(-1)), in a total of ten treatments. The addition of nitrogen increased the yield, average fruit weight and number of fruits per plant. The nitrogen and boron increased the diameter and length of the fruit, amount of seeds and content of soluble solids. The pH of the pulp decreased linearly with increasing doses of nitrogen and boron. It was observed a significant effect of N rates on the level of vitamin C.

Efeito de auxinas e boro no enraizamento de estacas caulinares de kiwi retiradas em diferentes épocas

This work was carried out to study the effects of some synthetical auxins and boron on the rooting of stem cuttings of kiwi (Actinidia deliciosa Pl. cv. Tomuri). Cuttings of semi-woody stems with two knots and leaves divided in two, with approximately 10 cm of length were utilized. The base of the cuttings received the following treatments: 1) water only; 2) NAA 300 ppm; 3) IBA 300 ppm; 4) NAA 300 ppm + B; 5) IBA 300 ppm + B; 6) NAA 0,5%-talc and 7) IBA 0,5%-talc. After these treatments, the stems were placed in suitable rooting dishes, with pure vermiculite in misty nebulization chamber for 120 days. Evaluations were made based on the following observations: percentage of rooted stem cuttings; reductor sugar and total sugar analyses and tryptophan analyses. The results showed that the autumm season is the best for rooting for kiwi stem cuttings. The exogenous application of 0.5% of IBA talc on the bases of the cuttings showed positive results.

Eficiência de uso de boro no crescimento de clones de eucalipto em vasos

This paper evaluated the critical level, responsivity and boron use effciency on growth and the biomass production in six Eucalyptus grandis x Eucalyptus urophylla clones (Ca, Cb, Cc, Cd, Ce and Cf). An experiment was carried out in pots containing ground silicon, under greenhouse conditions using four boron rates per solution (0; 0.135; 0.27; 0.54 mg L -1 of B). The treatments were combined in a randomized block experimental design in a 4 × 6 factorial scheme with three replications. Plant height, stem diameter, dry matter production in the shoots of the plant and boron use effciency in the leaves, stem and total dry matter at the 8th month of age were evaluated. Due to boron fertilization, growth and shoot biomass were observed in the Eucalyptus plants after 240 days of being planted in pots. The increases in growth and biomass were 35 to 54% and 21 to 64%, respectively. The boron rates that promoted major growth of the plants were 0.33 to 0.44 mg L -1 of B and in this range the most effcient clone for dry matter production of leaves was Cf and the least effcient one to stem biomass production and the shoot biomass was Cd, no signifcant differences among other clones were observed. The critical level of boron in solution was 0.09 to 0.24 mg L -1 of B in the growth of the plants.

Crescimento de cultivares de mamoneira em função da aplicação de boro, durante a formação de mudas

It was objectified to quantify the initial growth of varieties of castor bean with boron fertilization. Had been tested to cultivate they AL-Guarani, Mirante 10 and Nordestina to the doses of 0; 0.25; 0.50; 0.75 and 1.0 mg kg -1 of B in controlled environment of greenhouse in the Sector of Cafeicultura of the Department of Agriculture of the UFLA. The characteristics valued were: height of plants, length of roots, leaf number, diameter of stem, mass of dry substance (MS) of leafs, of stem, the root and total. To cultivate Mirante 10 it was the one that got minor growth of the system of root. For leaf number to cultivate AL-Guarani it was superior to Mirante 10 and Nordestina. Also to cultivate better AL-Guarani if it detached how much to the production of total mass of MS, while to cultivate Mirante 10 produced more mass of MS than Nordestina.

Respostas de clones de Eucalyptus grandis e E. grandis x E. urophylla à supressão de boro

The present work had as objective the study of clones of Eucalyptus grandis and E. grandis × E. urophylla under boron suppression on growth in height and diameter, development of symptoms of deficiency, boron content in leaf and polyols production. Plants were cultivated in pots with quartz in a greenhouse using two levels of boron per solution (0 and 0.5 mg L-1 of B). The 32 treatments followed a factorial scheme: 16 × 2 -16 clones and two doses of boron in a randomized block experimental design, with fve repetitions, totaling 160 plots. Plants were evaluated weekly for deficiency symptoms and monthly for height, stem diameter and leaf content of boron in different plant parts. The content of polyols was measured in two occasions: at 162 days and 192 days after starting the experiment. Decrease of growth and quick development of deficiency symptoms 40 days after boron suppression were observed, as well as a decrease of polyols synthesis. Foliar analysis, with boron supplement, resulted in the presence of mannitol and sorbitol in high enough concentration so that the evaluated plants could be considered rich in those polyols. Under boron suppression, boron levels in different portions of branches and stems of plants, as well as the presence of mannitol and sorbitol, indicated a conditional mobility of boron in Eucalyptus.

Avaliação da disponibilidade de boro em um latossolo de Mato Grosso/MT

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Análise do processo de torneamento a quente auxiliado por resistência elétrica de quartzo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeitos de auxinas e boro no enraizamento de estacas caulinares de louro (Laurus nobilis L.)

Pós-graduação em Agronomia (Horticultura) - FCA

Caracterização de um aço microligado ao boro e tratado termicamente utilizado na fabricação de tubos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Determinação de boro, enxofre e fósforo em plantas medicinais por espectrometria de absorção atômica de alta resolução com fonte contínua

Pós-graduação em Química - IQ

Mobilidade de boro (10B) em cajueiro (Anacardium occidentale L.) e pessegueiro (Prunus persica L.)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Maturadores associados à boro e silício aplicados via foliar em cana-de-açúcar (Saccharum spp.)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Absorção e mobilidade do boro em cultivares de algodão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Absorção e translocação de boro em cafeeiro

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Alterações anatômicas e translocação de boro no algodoeiro

Pós-graduação em Agronomia (Agricultura) - FCA