Aims: This study aimed to evaluate the effects of different light spectra (quality of light) on the germination and vigour of seeds of Dovyalis abyssinica Warb.
Study Design: The treatments were arranged in a completely randomized experimental design.
Place and Duration of Study: The experiment was conducted in the Laboratory of Seed Technology, belonging to the State University of Western Paraná (UNIOESTE), Marechal Cândido Rondon – Paraná, Brazil, in the period from May to June 2017.
Methodology: The seeds were subjected to the following light regimes: white, blue, yellow and red, and the absence of light. Absence of light was obtained by the use of aluminium foil involving the gerbox type plastic boxes. The lights red, yellow and blue were obtained with cellophane, involving the gerbox boxes, and for the white light were used gerbox without coverage. The effects of treatments were evaluated using the following tests: germination, germination speed index and seedling performance. The results were tested for normality by the lilliefors test and subjected to analysis of variance (F test) and the means were compared by the Tukey test at 0.05 probability.
Results: The germination percentage was similar (p > 0.05) among the absence of light, and yellow, red and white lights. The results shows that the absence of light which the seeds and seedlings of D. abyssinica were submitted, stimulated a super stretching.
Conclusion: In general appearance, the results observed in this study show that despite the seeds of D. abyssinica present themselves as indifferent to light for germination; it was revealed that the quality of light to which the seeds and seedlings are subjected has significant influence in its development.
Alceu Pedrotti, Renisson Neponuceno de Araújo Filho, Sara Julliane Ribeiro Assunção, Sérgio Carlos Resende, Raimundo Rodrigues Gomes Filho, Fernanda Cristina Caparelli de Oliveira, Francisco Sandro Rodrigues Holanda, Djail Santos, João Lucas Aires Dias, Ana Paula Silva de Santana
The productivity level in the agroecosystems of the coasts of the Coastal Tracks 37°12'00"W 11°01'00"S can be affected by the management system adopted in the soil, altering their physical, chemical and biological properties, compromising productivity of cultivated crops. This study evaluated the effect of no-tillage systems (no-tillage, minimum and conventional tillage) and previous ones: peanut (Arachis hypogaea), crotalaria (Crotalaria juncea), beans (Phaseolus vulgaris) and pigeon pea (Cajanus cajan). The spike yield of sweet corn (Zea mays L.) on an Ultissol, aimed to measure the productivity of the agroecosystem studied in the Coastal Tablelands Sergipano. The maize productivity evaluation parameters were: number of ears, number of productive plants, weight of green ears and relation between number of plants with ears and total number of plants; being measured for each system of preparation of the soil and for each culture antecedent to the corn. The data were submitted to the analysis of variance and the means were compared by the test of Tukey at 5% of probability. The no - tillage system provided better levels of sweet corn yield (9.2 t.ha-1), as well as a higher number of plants per hectare (44,382 plants.ha-1), a higher number of spikes per hectare (39,679 spikes.ha-1), and a higher proportion of plants with spike and total plants (89%). Among previous crops, solar hemp provided higher yields of sweet corn in conventional and minimum cultivation systems (7.263 t.ha-1 and 9.004 t.ha-1, respectively), while bean cultivation was the preferable previous crop in the no-tillage system (9.674 t.ha-1) after eight years of experimentation.
Kleber V. Cordeiro, Hosana A. F. Andrade, Edson D. de Oliveira-Neto, Nayron A. Costa, Bruna R. dos S. Rocha, Samuel F. Pontes, Yasmine O. T. Marzullo, Francisca E. do N. Pinto, Nitalo A. F. Machado, Raissa R. S. da Silva-Matos
Melon production in recent years has shown great growth and success in cultivation which depends on a good production of seedlings, and poor quality of the substrate can cause problems in the germination process. The study aimed to evaluate changes of melon with different proportions of the substrate based on the decomposed stem of babassu. For this, different proportions of decomposed babassu stem (DBS) were used viz., S1: 100% soil; S2: 20% DBS+ 80% soil; S3: 40% DBS + 60% soil; S4: 60% DBS + 40% soil; S5: 80% DBS + 20% soil; and S6: 100% DBS, using a completely randomized design, having six treatments with four replicates. Parameters such as, emergence speed index, germination percentage (%), plant height (cm); stem diameter (mm); root length (cm); root volume (cm3), dry root mass and dry mass of shoot (g) were evaluated. Although germination did not show any difference, the rate of emergence showed statistically equal results between them and higher than the control. Based on the data obtained, the study concludes that substrates based on the decomposed stem of babassu with proportions between 40, 60 and 80% can be used for the production of melon seedlings. These predictors, however, need further work to validate reliability.
Hancornia speciosa Gomes is a Brazilian native tree. Its fruit, mangaba, has both social and economic importance and is collected by traditional people, mainly women. However, its natural habitats are being threatened by anthropic pressure. Our aim in this work was to characterize the population structure of H. speciosa along the Mangabeira trail at the Reserva do Caju (11°6’10.12” S, 37°11’4.59” W) located in Sergipe, Brazil. We sampled all mangabeira individuals in the trail and divided them into three classes of development (seedlings, juvenile and adult trees). In order to analyse their horizontal and vertical distribution, we measured the trees' diameter and height. The population structure of H. speciosa at the Mangabeira trail is mainly composed of seedling (46%) and juvenile (29%) individuals, which indicates a regeneration process. The diameter distribution of seedlings and adults was divided into six classes. The three lowest classes accounted for 94% of the total of trees. We also observed a typical “inverted J” pattern, with a high number of young plants, which is common to tropical forests. In terms of their vertical distribution, the majority of the individuals were classified under the lower stratum, which corresponded to 47% of the total population featuring 1.01-m average height. The high coefficient of variation in the lower stratum may explain the heterogeneity of the vertical structure, formed by individuals with different strategies to capture sun light and different behaviour towards resources supply. Thus, it is not possible to state that this population is in balance.
Pineapple is a delicious tropical fruit with a fine flavor and high nutritive value. It is one of the most important commercial fruits crop in the world. The study examined the constraints and prospects of pineapple in Delta State. Multi stage sampling technique was used to extract relevant information from sixty pineapple farmers from one Agricultural Zone in Delta State. Data collected were analyzed using descriptive statistics such as frequency distribution, percentages and mean. The result indicates that majority (47%) of the farmers are within middle age with a mean of 45.2. The average farming experience of pineapple farmers was 12.8years. The result also revealed that most (78.3%) of the farmers are located far from their residence, while majority (50%) of the pineapple farmers cultivated local variety. Respondents attested to the fact that there are high prospects for new pineapple investors and exiting farmers in the area. The study identified the potentials of pineapple production in the area. These includes; boosting of income (mean =2.60), promotion of good health through consumption among farmers ((mean =2.52) and checking of social vice as a result of idleness ((mean =1.84) among others. The major identified problems of pineapple farmer’s include; lack of improved planting materials, high fruit perishabilty and low fruit price e.tc. The study recommends that government should established cold storage facilities to reduce fruit perishability, make available improved pineapple suckers to farmers and easy access to loan by farmers from government and NGO to expand their farm size.