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Effects of Sunlight or Shade on Maturity and Optical Density in Blueberries

机译：日光或阴影对蓝莓成熟度和光密度的影响

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Sensing of maturity in blueberries (Vaccinium darrowi L.) using optical density measurements has long been known and used by researchers. This past year a large sample of berries (540) were visually selected with six levels of maturity; Green, White,Red. Just-Ripe, Ripe, and Over-Ripe. Subsequently, spectrographs of individual berries were obtained from about 400 nm to 900 nm. Each berry was chemically assayed for soluble solids (SS), pH, and titralable acidity (Acids). One interesting observation was that the SS/Acids ratios within each of the six carefully selected levels of maturity varied greatly and overlapped between the maturity categories. This study was initiated by one primary question. Is there an effect on the SS/Acids ratio of an individual berry if the berry is allowed to mature in either the presence or absence of sunlight? A secondary issue of investigation was: It" there is a sun/shade effect on aberry's SS/Acids ratio, can this effect be observed by measuring the optical densityratio at 740 and 800 nm? Results of 38 sun and 40 shade berries (Cultivars, 'NC 3103' and 'NC 3104') had mean SS/Acids ratios of 30.9 and 31.5, respectively, and were in the same (alpha = 0.05) Duncan's multiple range grouping. Results of 57 'NC 3103' and 21 'NC 3104' berries had mean SS/Acids ratios of 35.6 and 19.3, respectively, and were in different (alpha = 0.05) Duncan's multiple range groupings. Correlation coefficients between the SS/Acids ratios and the optical density ratio ranged from -0.88
机译：长期以来，研究人员已经知道并使用光密度测量技术来检测蓝莓的成熟度。去年，我们从视觉上选择了具有六个成熟度等级的大量浆果（540）。绿色，白色，红色。刚熟，成熟和过度成熟。随后，从约400nm至900nm获得单个浆果的光谱图。化学分析每个浆果的可溶性固体（SS），pH和可滴定酸度（酸）。一个有趣的观察结果是，六个精心选择的成熟度级别中的每个级别内的SS /酸比率大不相同，并且在成熟度类别之间重叠。这项研究是由一个主要问题发起的。如果允许浆果在有阳光或没有阳光的情况下成熟，它会对单个浆果的SS /酸比率产生影响吗？研究的第二个问题是：“对浆果的SS /酸比率有遮阳/遮光作用，可以通过测量740和800 nm处的光密度比来观察到这种作用吗？38个遮阳和40个遮光浆果（品种， 'NC 3103'和'NC 3104'）的平均SS /酸比率分别为30.9和31.5，并且在相同的（alpha = 0.05）Duncan多范围分组中。结果为57'NC 3103'和21'NC 3104浆果的平均SS /酸比率分别为35.6和19.3，并且处于不同的（α= 0.05）Duncan多范围分组中，SS /酸比率与光密度比之间的相关系数在-0.88

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