842 research outputs found

    Integration of terrestrial laser scanning and spectral canopy scanner in horticulture applications

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    One of the most difficult challenge in the everyday practice to describe the canopy growing of fruit trees in an orchard. The photosynthetic activity is the basic of the primer production of plants. The measurement of leaf area and determination of the photosynthetic activity could be occurred with some elaborated methods between experimental conditions. In this article we present such an integrated methodology, which is ideal to determine the geometric and spectral characteristic of fruit trees between field conditions.We have carried out laser scanning technology to investigate the geometric-topological characteristics and parallel the active infra-red sensor to collect spectral data about an apple orchard. The surveys were worked out in an intensive apple orchard with drip irrigation system, protected by hail net in Study and Regional Research Farm of the University of Debrecen near Pallag. This study shows the filtering and interpretation methods of created data. The produced high accuracy data can be directly used in the precision horticulture. It could serve as a guiding data to implementation a future “virtual horticulture”. Higher spatial and temporal resolution could help for a better recognition of water balance of orchards

    A Stochastic Model to Describe the Fruit Number and Position on Long Peach (Prunus Persicae) Shoot

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    A stochastic model of fruit number and position on a long peach (Prunus persica cv. yingzhui) shoot of 10-year-old tree is presented. In model there are generally 3 states in which state 2 represents that a node with two fruits, state 1 represents that a node with one fruit, state 0 represents that a node without fruit. Parameters of model are estimated using the STAT module of Matlab software. The observed data are sampled from mature trees at two harvest seasons during two years in a row (2013-2014) in Lianping, Guangdong, China. Results indicate that upper nodes usually have one fruit, middle nodes have no more than one to two fruits, and most of basal nodes have zero to one fruit. The total number of fruits increases with the number of remaining nodes after pruning. Occupancy distributions of different states in model demonstrate that pruned long shoots had 5 to 7 fruits, whereas unpruned long shoots averaged more than 10 fruits. The fruit distributions on the shoots follow a well-defined pattern: nodes that bear one or two fruits were significantly higher in the median part of the shoot but lower on the basal and distal nodes. In addition, three-dimensional representations of the fruit position were reconstructed using PruningSim software

    Integration of terrestrial laser scanning and spectral canopy scanner in horticulture applications

    Get PDF
    One of the most difficult challenge in the everyday practice to describe the canopy growing of fruit trees in an orchard. Thephotosynthetic activity is the basic of the primer production of plants. The measurement of leaf area and determination of thephotosynthetic activity could be occurred with some elaborated methods between experimental conditions. In this article we present such anintegrated methodology, which is ideal to determine the geometric and spectral characteristic of fruit trees between field conditions.We havecarried out laser scanning technology to investigate the geometric-topological characteristics and parallel the active infra-red sensor to collectspectral data about an apple orchard. The surveys were worked out in an intensive apple orchard with drip irrigation system, protected by hailnet in Study and Regional Research Farm of the University of Debrecen near Pallag. This study shows the filtering and interpretation methodsof created data. The produced high accuracy data can be directly used in the precision horticulture. It could serve as a guiding data toimplementation a future “virtual horticulture”. Higher spatial and temporal resolution could help for a better recognition of water balance oforchards

    From scientist to society

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    • How to restore a park or an old mansion? • Is it possible to grow grapes in your own garden? • Should you plant birch-trees in a fallow field? • How to restore an old mill inherited from your Grandpa? • Is the pond behind the sauna at our farm suitable for breeding carps? The researchers at the Eesti Maaülikool (Estonian University of Life Sciences) are sure to know the answers to these five questions. The scientists of the EMU are bound to know answers to many other questions as well. You can find such questions by the dozen in the present booklet. On the other hand, we would like to draw your attention to the know-how at our University and show where the disciplines fostered here are heading to. The booklet includes a list of themes for applied research and development. The themes break up into nine groups: plant, forest, animal, food, energy, environmental, economic, construction, and technological science. We are gladly ready to help the farmer, entrepreneur or local government

    Simulation and Quantitative Analysis of Branching Patterns of the Plum Tree

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    Background and Aims: Pruning fruit tree is undoubtedly a critical cultural practice which leads to sustainable production along with profitability of the trees. Several limitations of classic approaches pertaining to studying pruning techniques based mostly on fruit yields and quality evaluations have kept us from thoroughly understanding the growth habits of branches under field conditions. A simulation model of branching patterns of the plum tree (Prunus salicina cv. Sanhua) introduced in this paper enables both non-professionals and professionals to better understand and predict pruning effects on branching pattern and fruiting habit of the trees. The visual comparison of branching and fruiting characteristic of the prunedparent shootprovides immediate feedback on different pruning intensities at the level of shoots.Methods: Semi-Markov chains were built with diverse initial probabilities, transition probabilities and occupancy distributions to describe the number of occurrence of girl shoots along the pruned parent shoot. Branching structures were reconstructed using AmapSim computer software with different shoot types, considering topological and geometrical functions.Key Results: The results demonstrated different branching zones in the pruned parent shoot were found in the same order. Moderate heading back and slight heading back parent shoots differed in short shoot position. Of all pruning intensities, the branching zone in severe heading back parent shoots was shorter than the sylleptic branching zone. The three-dimensional reconstruction images of pruned parent shoots displayed illustrative examples to elucidate proper pruning technique among three pruning intensities.Conclusions: Severe heading back parent shoot had a strong branching capability. In comparison with moderate heading back, slight heading back parent shoot had a higher proportion of fruiting zones, therefore the latter is usually considered balancing vegetative and reproductive growth in the conventional pruning of plum trees.The stochastic model could serve as a feasibility groundwork against which quantitative differences in branching structures of prune parent shoot under different pruning systems can be compared
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