São José dos Campos, Brazil
São José dos Campos, Brazil

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The experiment was carried out to evaluate the dry mater accumulation rate (TAMS) and levels of crude protein (PB), neutral detergent fiber (FDN) and sulfuric acid lignin (LAS) in dwarf elephantgrass genotypes submitted to different cutting intervals. The experimental design was a randomized block with three replicates in a splitplot, where genotypes were allocated plots and subplots in the cutting intervals. Were evalued five genotypes of dwarf elephantgrass (CNPGL 00-1-3, CNPGL 94-34-3, CNPGL 92-198-7, CNPGL 92-117-3, CNPGL 00-1-5) and cv. Mott in six cutting intervals (14, 28, 42, 56, 70 and 84 days). The genotype CNPGL 00-1-3 showed higher TAMS, however, among other dwarf genotypes, those who stood out were the genotypes CNPGL 92-198-7, Mott, CNPGL 94-34-3 and CNPGL 92-117-3. As for protein level, the CNPGL 00-1-3 and CNPGL 00-1-5 genotype showed linear behavior and the other genotypes showed quadratic behavior. The level of FDN showed significant variation depending on the cutting intervals only for the genotypes CNPGL 00-1-3 and CNPGL 92-198-7. There was an interaction among genotypes and cutting intervals for the values of LAS only for the CNPGL 00-1-3, CNPGL 92-198-7 and CNPGL 92-117-3. Genotypes CNPGL 92-198-7 and CNPGL 94-34-3 were selected, together with the Mott genotype for the evaluation phase under grazing.

de Macedo C.M.P.,Laboratorio Of Fitotecnia | Pereira M.G.,Laboratorio Of Melhoramento E Genetica Vegetal | Cardoso D.L.,Laboratorio Of Melhoramento E Genetica Vegetal | da Silva R.F.,Laboratorio Of Fitotecnia
Journal of Seed Science | Year: 2013

This study aimed to evaluate the physiological quality of seeds of three hybrid combinations and their reciprocals, as well as the selfed parents, and to estimate genetic parameters associated with seed quality, and possible reciprocal effects. The experiment used F1 hybrid papaya seeds and their reciprocal crosses between JS12 and Sunrise Solo 72/12, Sekati and Waimanalo, and the seeds of the parents and two varieties, totaling 12 treatments in a completely randomized design with four replications. Weight of 1,000 seeds, germination, seedling fresh weight and seedling dry weight, first count, speed of germination and seedling emergence were determined. There was no xenia effect for weight of 1,000 seeds and seedling fresh weight. The reciprocal effect was not expressed for germination and seedling emergence, while for the other traits, it was not expressed only for JS12 x Sekati. Differences among hybrids and their parents occurred as a result of the action of pollen in the crosses, and justified by early heterosis. The most sensitive vigor tests to discriminate differences in performance of hybrids and their reciprocals were speed of germination and seedling fresh weight. There were high magnitudes of the estimates for the genotypic determination coefficient for most of the evaluated variables, except for seedling fresh weight.

Rubim R.F.,Laboratorio Of Fitotecnia | Freitas S.P.,Laboratorio Of Fitotecnia | Vieira H.D.,Laboratorio Of Fitotecnia | Gravina G.A.,Laboratorio Of Engineering Agricola
Journal of Seed Science | Year: 2013

For an adequate conservation of seeds it is essential previously establishing the ideal conditions for their storage. Thereby, this study aimed at evaluating influence of packaging types and storage environmental conditions on physiological quality of fennel seeds. The seeds were stored into three different packaging types (cotton bags, multiwall paper bags, and glass containers), and stored under two environmental conditions (laboratory and cold chamber) during a twelve months period. Physiological seed quality was assessed before storage and at every two months after storage through tests of germination, germination speed index, and electrical conductivity. Experiment was performed on a completely randomized design with treatments arranged in a split-split plot arrangement in time (two environmental storage conditions × three packaging types × six storage periods + a control treatment), with four replications. Fennel seeds packaged into glass containers have maintained their physiological quality stable over the twelve storage months regardless storage environmental conditions; being considered the best container for storing fennel seeds; and cotton packaging was considered as the least efficient for both storage under laboratory environmental conditions as well as for storage under cold chamber conditions.

Silva J.I.,Federal University of Pelotas | Vieira H.D.,State University of Norte Fluminense | Vieira H.D.,Laboratorio Of Fitotecnia | Viana A.P.,State University of Norte Fluminense | And 3 more authors.
Coffee Science | Year: 2010

In coffee transplant production, substrate is one of the factors limiting growth. The ideal substrate should meet the oxygen, water and nutrient requirements for normal plant growth. The objective of this work was to verify the effect of different substrates and containers on the growth of coffee transplants in the nursery, and also to develop a new methodology for producing Coffea canephora Pierre ex A. Froehner transplants using agroindustrial residues. The following containers were used: polyethylene bags, conical tubettes with 80 cc and 120 cc capacity and pressed blocks (mixture of organic material). Each treatment corresponded to one type of substrate and one type of container. The results showed that organic material may be a potential substrate for C. canephora transplant production. The transplants produced in the organic material, organic material + controlled nutrients, soil + cow manure + controlled nutrients substrates presented the best results for all the traits compared, in relation to the other substrates, indicating that they are the best option for producing coffee transplants. The pressed block, polyetilene bags and big size tubettes may be appropriate containers for C. canephora transplant production. The commercial substrate was inadequate for coffee transplant production, regardless of the container.

Robaina R.R.,UENF | Marinho C.S.,Laboratorio Of Fitotecnia | de Souza R.M.,Laboratorio Of Nematologia | Campos G.S.,State University of Norte Fluminense
Revista Brasileira de Fruticultura | Year: 2012

Previous screenings have found resistance to M. enterolobii in cattley guava (Psidium cattleyanum sabine) genotypes, but not in guava (P. guajava). This study aimed to evaluate inarching between the guavas 'Paluma' and cattley as a mean to obtain nematode-resistant guava plants. Eighty 'Paluma' plantlets were produced from stem cuttings and cultivated in 5L pots (one plant per pot) until they reached a stem diameter of about 8 mm at 10 cm from the collar. Cattley guavas were obtained from true seeds of the accessions 115, 116 and 117. When all the plants reached a stem minimum diameter for inarching, two cattley guava seedlings were transplanted to each of the 5L pots, into holes of about 280 cm3 dig on each side of the 'Paluma' plants. For inarching, a cut was made in the 'Paluma' stem, and one of the cattley guava or 'Paluma' seedling was inserted under the bark. The other side plant remained as a blank control. Every 20 days the following variables were evaluated: fusion of tissues between the grafted plants and growth of the plants ́ stem diameter. successful inarching, as measured by initial connection between vascular tissues and survival of the plants, occurred more often between 'Paluma' plants than between 'Paluma' and cattle guava. Nonetheless, in the long term the plants often failed to develop functional vascular connection, since removing the root system of 'Paluma' plants resulted in their death, since root system of the cattley guavas were unable to sustain their nutrition. in conclusion, more study is needed to develop inarching as a method to produce guava rootstocks.

Robaina R.R.,State University of Norte Fluminense | Campos G.S.,Laboratorio Of Fitotecnia | Marinho C.S.,Laboratorio Of Fitotecnia | Souza R.M.,State University of Norte Fluminense | Bremenkamp C.A.,Laboratorio Of Fitotecnia
Ciencia Rural | Year: 2015

The use of resistant rootstocks could be a promising method to control nematode Meloidogyne enterolobii in commercial plantations of guava. The present study aimed to evaluate the success of grafting guava as a scion on accessions of cattley guava as rootstocks resistant to M. enterolobii. The treatments consisted of the rootstocks cattley guava plants (three accessions of Psidium cattleyanum) and common guava (control). In the apical wedge grafting method, scion of ‘Paluma’ cultivated variety was used. The experiment was arranged in a randomized block design with four treatments and five replicates, and eight plants per plot. The saplings produced as described before were planted in the field where the initial growth of the different combinations were evaluated. Graft success was observed for the control (common guava) and for accessions 115 and 117 of cattley guava plants, with success rates of 63, 32 and 29%, respectively. In the field, the cattley guava used as rootstocks hampered Paluma canopy development and caused death of plants. Incompatibility of P. cattleyanum as rootstocks for P. guajava Paluma was confirmed one year after cultivation in field. © 2015, Universidade Federal de Santa Maria. All rights reserved.

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