Determination of Maturity of Blueberry Fruit Based on IAD Index and Its Application Research

doi:10.11923/j.issn.2095-4050.cjas2024-0023

Abstract

Abstract:

In order to accurately evaluate the harvest maturity of blueberries and ensure fruit quality, the experiment selected six blueberry cultivars: ‘Northland’, ‘Bluecrop’, ‘Draper’, ‘Reka’, ‘Duke’, and ‘Blue gold’ as test materials, and used near-infrared spectroscopy to establish regression model to determine the relationship between soluble solids, titratable acids, hardness, anthocyanins, vitamin C, and absorbance difference index (I_AD value). Research had found that with fruit maturity increase, the titratable acid and hardness of blueberries significantly decreased, while the contents of soluble solids, vitamin C, and anthocyanins generally showed an upward trend. The I_AD value of blueberries showed a highly significant positive correlation with anthocyanins (r=0.90, p≤0.01) and a significant negative correlation with hardness (r=-0.82, p≤0.01). Additionally, there was a positive correlation with vitamin C and soluble solids, and a negative correlation with titratable acid. Regression equations were derived to describe the changes in the I_AD value based on the five quality indicators, demonstrating that the I_AD value can reflect the fruit maturity. The recommended harvest standards for the six main cultivars are as follows. The I_AD values of ‘Northland’ and ‘Lanjin’ are 1.9-2.0, the I_AD values of ‘Bluecrop’ and ‘Draper’ are approximately 1.8, and the I_ADvalues of ‘Reka’ and ‘Duke’ are 1.7-1.8.

Key words: blueberry, non-destructive, DA-Meter, ripeness, fruit quality, harvest

WANG Bowei, GAO Yukai, WANG Yushen, FENG Shaoran, CHE Limei, XING Lu, SUN Haiyue. Determination of Maturity of Blueberry Fruit Based on I_AD Index and Its Application Research[J]. Journal of Agriculture, 2025, 15(4): 42-48.

Figures/Tables 4

References 30

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品质指标	回归拟合方程及相关系数
品质指标	花青素	硬度	维生素C	可溶性固形物	可滴定酸
北陆	Y=4.273X-5.118	Y=-1.957X-5.197	Y=16.04X-14.23	Y=2.678X+5.758	Y=-0.1431X+0.7522
北陆	r=0.999**	r=-0.996*	r=0.676	r=0.984*	r=-0.466
蓝丰	Y=3.059X-3.766	Y=-1.052X-3.104	Y=38.46X-46.43	Y=3.688X+4.878	Y=-2.009X+4.068
蓝丰	r=0.966*	r=-0.998**	r=0.981*	r=0.91	r=-0.981*
德雷珀	Y=3.917X-4.791	Y=-2.899X+6.659	Y=26.69X-24.59	Y=1.987X+7.930	Y=-1.363X+2.803
德雷珀	r=0.971*	r=-0.94	r=0.893	r=0.948	r=-0.956*
瑞卡	Y=5.801X-7.037	Y=-2.598X+5.947	Y=28.56X-32.36	Y=3.772X+4.391	Y=-1.322X+2.719
瑞卡	r=0.961*	r=-0.975*	r=0.886	r=0.976*	r=-0.928
都克	Y=3.989X-3.873	Y=-2.570X+6.228	Y=33.70X-40.60	Y=3.427X+5.330	Y=-1.507X+3.012
都克	r=0.983*	r=-0.975*	r=0.875	r=0.76	r=-0.998**
蓝金	Y=4.145X-4.794	Y=-2.150X+5.941	Y=16.33X-14.83	Y=1.261X+7.727	Y=-0.5175X+1.829
蓝金	r=0.982*	r=-0.995*	r=0.76	r=0.85	r=-0.708

品质指标	回归拟合方程及相关系数
品质指标	花青素	硬度	维生素C	可溶性固形物	可滴定酸
北陆	Y=4.273X-5.118	Y=-1.957X-5.197	Y=16.04X-14.23	Y=2.678X+5.758	Y=-0.1431X+0.7522
北陆	r=0.999**	r=-0.996*	r=0.676	r=0.984*	r=-0.466
蓝丰	Y=3.059X-3.766	Y=-1.052X-3.104	Y=38.46X-46.43	Y=3.688X+4.878	Y=-2.009X+4.068
蓝丰	r=0.966*	r=-0.998**	r=0.981*	r=0.91	r=-0.981*
德雷珀	Y=3.917X-4.791	Y=-2.899X+6.659	Y=26.69X-24.59	Y=1.987X+7.930	Y=-1.363X+2.803
德雷珀	r=0.971*	r=-0.94	r=0.893	r=0.948	r=-0.956*
瑞卡	Y=5.801X-7.037	Y=-2.598X+5.947	Y=28.56X-32.36	Y=3.772X+4.391	Y=-1.322X+2.719
瑞卡	r=0.961*	r=-0.975*	r=0.886	r=0.976*	r=-0.928
都克	Y=3.989X-3.873	Y=-2.570X+6.228	Y=33.70X-40.60	Y=3.427X+5.330	Y=-1.507X+3.012
都克	r=0.983*	r=-0.975*	r=0.875	r=0.76	r=-0.998**
蓝金	Y=4.145X-4.794	Y=-2.150X+5.941	Y=16.33X-14.83	Y=1.261X+7.727	Y=-0.5175X+1.829
蓝金	r=0.982*	r=-0.995*	r=0.76	r=0.85	r=-0.708