Evaluation of photosensitive films for light measurements in the fruiting zone of grapevine canopies

Andrea Bontempo, Jason P. Smith, M. Brandt, E. Peterlunger, M. Stoll
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引用次数: 2

Abstract

The potential influence of fruit exposure and canopy manipulations on grape berry composition is well recognized. However, a simple and low cost method for quantifying the amount of light reaching the fruiting zone is lacking. The objective of the present study was to test the application of a commercial system of photosensitive azo-dye coated plastic films for characterizing light conditions within grapevine canopies. The fading rates of three films of differing light sensitivity were initially monitored in a fully exposed position, and these all showed a linear or near linear relationship with radiation measured by an adjacent global solar radiation sensor. When mounted in the fruiting zone of a vertically trained cool climate 'Riesling' vineyard for two periods following early and late leaf removal treatments, the films were able to quantify the change in light exposure within the fruiting zone. Total radiation values calculated using an on-site calibration or manufacturer´s equation were comparable. While some consideration is needed with regard to the choice of film sensitivity and positioning within the canopy, these initial evaluations suggest these light sensitive films can provide a simple and accurate method for characterizing light conditions and quantifying cumulative radiation within the fruiting zone.
葡萄冠层果实区光测量用光敏膜的评价
果实暴露和冠层操作对葡萄果实成分的潜在影响是公认的。然而,缺乏一种简单而低成本的方法来量化到达结果区的光量。本研究的目的是测试光敏偶氮染料涂覆塑料薄膜的商业系统的应用,以表征葡萄树冠内的光条件。在完全暴露的情况下,对三种不同光敏度薄膜的褪色速率进行了初步监测,结果表明,这三种薄膜的褪色速率与相邻的全球太阳辐射传感器测量的辐射呈线性或近线性关系。当安装在一个垂直训练的凉爽气候的雷司令葡萄园的结果区,在早期和晚期的叶片去除处理后的两个时期,这些薄膜能够量化结果区光暴露的变化。使用现场校准或制造商公式计算的总辐射值具有可比性。虽然在膜的灵敏度和冠层内位置的选择上还需要考虑一些因素,但这些初步评价表明,这些光敏膜可以为表征出结果区的光条件和量化累积辐射提供一种简单而准确的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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