BIBLIOTECA HORTICULTURA

BIBLIOTECA HORTICULTURA

  • Development of a Difference of Absorption (DA) Index for 5 major canned peach varieties

    Development of a Difference of Absorption (DA) Index for 5 major canned peach varieties

    The DA meter is an instrument that, by means of absorbance properties enables measurement of the chlorophyll content in fruit. The chlorophyll content is a precise index of the fruits ripening state, is very accurate and is not affected by any environmental factors. Fresh fruit orchards and pack houses have used the DA meter to better understand fruit ripening in the field and enabled growers to better grade fruit on ‘maturity’ rather than just colour as is currently the case. Fruit can be more reliably separated into three categories, namely: - ready to process, - ideal for short… Read more

  • DA-meter used for fruit maturity testing in a research related to improve size and portion of class I apple cv. Gala Mondial

    DA-meter used for fruit maturity testing in a research related to improve size and portion of class I apple cv. Gala Mondial

    The objective of the present work was to investigate alternatives to chemical crop load management (CLM) for cv. ‘Gala Mondial’ to improve fruit quality, particularly fruit size and portion of class I and its effects on June drop and return bloom as well as evaluate fruit maturation with the new, non-invasive DA-meter. Moderately flowering apple trees cv.’Gala Mondial’ at Klein Altendorf under white hail net in 2016 were subjected to four crop load motions: a) shading (90% for 77 daylight hours) at the end of May, b) mechanical blossom thinning with the Bonner device with… Read more

  • Maturity index meter and modelling to optimise pre- and post-harvest apple quality

    Maturity index meter and modelling to optimise pre- and post-harvest apple quality

    Determining the correct maturity for the harvest of apples is important for optimal storage and the prevention of storage disorders such as Superficial Scald (SS) and Internal Browning (IB). Traditionally, destructive techniques such as starch conversion, ethylene production, respiration rate and colour determination were performed by growers and researchers. A study undertaken by the Department of Jobs, Transport & Resources (DEDJTR) in collaboration with the University of Melbourne used a Difference of Absorption (DA) meter to non-destructively measure and track the maturity of ‘Rosy… Read more

  • Peach and nectarine fruit maturity can be predicted using IAD DA-Meter index

    Peach and nectarine fruit maturity can be predicted using IAD DA-Meter index

    Harvest maturity is closely related to peach fruit quality and has a very important effect on the fresh fruit market. Unfortunately, at present, it is difficult to determine the maturity level of peach fruits by artificial methods. The objectives of this study were to develop quadratic polynomial regression models using near-infrared spectroscopy that could determine the peel color difference, fruit firmness, soluble solids content (SSC), soluble sugar, organic acid components, and their relationships with the absorbance of chlorophyll (index of absorbance difference, IAD) in late… Read more

  • Stonefruit maturity & fruit quality

    Stonefruit maturity & fruit quality

    Information about stonefruit maturity and quality is available on the “Profitable Stonefruit” section of the Australian site Horticulture Industry Networks. http://www.hin.com.au/ Agriculture Victoria’s researchers at Agribio, Bundoora, are looking at ways to optimise fruit maturity at harvest, using non-destructive technologies, to meet market expectations and to understand how fruit maturity affects storage and its impact on fruit composition and quality. Variable maturity at harvest affects fruit responses to shelf life, cold storage and consequent quality through the handling… Read more

  • Non destructive firmness tester for a wide range of fruits

    Non destructive firmness tester for a wide range of fruits

    The FruitFirm meter, by T.R. TURONI, is a hand-held, self-contained device to test firmness of a wide range of fruits such as kiwifruit, cherries and other stone fruits, pears, olives, … Initially developed in New Zealand as a research tool to determining ripening & maturity stages, satisfies the need of a quality control device that can easily quantify the firmness without destroying the fruit. The data displayed may give individual readings or some degree of fruit or sample averaging. The sensor output can be Read more

  • DA meter, a valuable tool to divide apples within harvest dates to assess susceptibility to postharvest disorders

    DA meter, a valuable tool to divide apples within harvest dates to assess susceptibility to postharvest disorders

    Most physiological disorders of apples are associated with maturity. Examples include bitter pit and superficial scald, typically having highest incidences in earlier harvested fruit, and water-core, senescent breakdown and low temperature internal browning disorders such as soft scald, typically having highest incidences in later harvested fruit. The variation of occurrence of these disorders can be variable as within a given lot of fruit, presumably reflecting factors such variable maturity. Even fruit replications of 100 fruit each provide sample accuracy of only 10%. A new tool to… Read more

  • Confirmation of the reliability of the IAD as a ripening index for cherries

    Confirmation of the reliability of the IAD as a ripening index for cherries

    The color of sweet cherry fruit is an important indicator of ripeness and quality. However, the tools that can be used to determine the ripeness of cherry fruits on trees or at storage are mostly subjective in practice. A new portable device based on visible and near infrared (vis/NIR) spectroscopy developed by Bologna University was used to follow the ripening evolution of cherry fruits. The Cherry-Meter measures the IAD, an index that is able to follow the ripening evolution of cherry fruit. The reliability of the IAD as a ripening index is confirmed by the fact that it does… Read more

  • How to measure ripeness of fruit in 6 simple steps using the DA-Meter

    How to measure ripeness of fruit in 6 simple steps using the DA-Meter

    The DA-meter is an innovative tool for agriculture, by tr Turoni; it measures the fruit’s ΔA index that is an indicator of its maturation level. However how do you actually make a measurement with the DA-meter? Let’s go through the few simple actions you have to make every time you will start a set of measurements with the DA-meter. 1►Turning on the instrument Turn on the instrument by pressing the power button for less than a second, you will hear a low ‘beep’ when it turns on (see draws in the original information, HERE or below). At this point, unless you did it… Read more

  • Possibility of sorting asymptomatic peach fruit, by DA-meter, that will show different brown rot incidence during storage

    Possibility of sorting asymptomatic peach fruit, by DA-meter, that will show different brown rot incidence during storage

    The DA-meter is a hand-held instrument developed from vis/NIR spectroscopy that measures the index of absorbance difference (IAD) correlated with the flesh chlorophyll-α content of fruit. It was used to divide in two different ripening classes, class I (climacteric peak) and class II (onset of climacteric), harvested fruit belonging to three peach cultivars. At harvest and after 6 days of storage at 20°C, quality parameters such as flesh firmness (FF), soluble solid contents (SSC), ethylene emission and brown rot incidence were evaluated. Data on ethylene production reported a… Read more