Effects of Substrate Ratio on Root Growth and Physiological Characteristics of Carrot

doi:10.11924/j.issn.1000-6850.casb2022-0481

Abstract

Abstract:

To investigate the effect of different ratios of two substrates with significant differences in bulk density on the root growth of carrot, the ‘Kuroda’ carrot was used as experimental material, the organic cultivation substrate and fine sand were mixed in the ratio of 3:1 (T1), 2:1 (T2), 1:1 (T3), 1:2 (T4) and 1:3 (T5) for carrot cultivation. Then, the main agronomic characters, carotenoid and soluble sugar contents of carrots were determined. The results indicated that each agronomic trait of carrot showed a certain correlation. The total fresh weight, aboveground fresh weight, underground fresh weight, fibrous root fresh weight and fibrous root water content showed a trend of increasing and then decreasing with the increase of the proportion of fine sand in the substrate. The maximum values were 18.83 g, 6.79 g, 14.02 g, 6.68 g and 98.49%, respectively. The length of taproot tended to decrease and then increase, and the diameter of taproot tended to increase, with maximum values of 15.32 cm and 13.47 mm, respectively. The variation of root shoot ratio was relatively small, with a maximum value of 3.23. Carrot grown in the T3 treatment performed better overall for the main agronomic traits. The contents of carotenoids and soluble sugars in carrot fleshy root in different substrates were significantly different，increasing first and then decreasing with the increase of the proportion of fine sand. The carotenoid content and soluble sugar contents peaked at 39.74 μg/g and 27.92 mg/g in the T2 and T3 treatment groups, respectively, which were significantly higher than other treatment groups. The experiment proved that different substrate ratios had significant effects on the growth and nutrient accumulation of carrots.

Key words: carrot, organic cultivation substrate, fine sand, root growth, physiological characteristics

HE Lingfeng, CHEN Chen, DENG Yuanjie, LU Jie, WANG Guanglong, TAN Guofei, WANG Yahui, DUAN Aoqi, SHU Sheng, LIU Hui, XIONG Aisheng. Effects of Substrate Ratio on Root Growth and Physiological Characteristics of Carrot[J]. Chinese Agricultural Science Bulletin, 2023, 39(16): 12-19.

Figures/Tables 6

References 36

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	总鲜重	地上部鲜重	地下部鲜重	根冠比	肉质根长度	肉质根直径	须根鲜重	须根含水率	类胡萝卜素	可溶性糖
总鲜重	1.000
地上部鲜重	0.916^**	1.000
地下部鲜重	0.797^**	0.491	1.000
根冠比	-0.693^**	-0.912^**	-0.138	1.000
肉质根长度	-0.763^**	-0.802^**	-0.442	0.797^**	1.000
肉质根直径	-0.174	-0.466	0.316	0.644^**	0.294	1.000
须根鲜重	0.482	0.300	0.612^*	-0.132	-0.474	0.341	1.000
须根含水率	0.573^*	0.389	0.697^**	-0.158	-0.404	0.178	0.716^**	1.000
类胡萝卜素	0.393	0.457	0.137	-0.521^*	-0.728^**	-0.421	0.276	0.341	1.000
可溶性糖	0.733^**	0.579^*	0.725^**	-0.348	-0.586^*	-0.057	0.486	0.799^**	0.482	1.000

	总鲜重	地上部鲜重	地下部鲜重	根冠比	肉质根长度	肉质根直径	须根鲜重	须根含水率	类胡萝卜素	可溶性糖
总鲜重	1.000
地上部鲜重	0.916^**	1.000
地下部鲜重	0.797^**	0.491	1.000
根冠比	-0.693^**	-0.912^**	-0.138	1.000
肉质根长度	-0.763^**	-0.802^**	-0.442	0.797^**	1.000
肉质根直径	-0.174	-0.466	0.316	0.644^**	0.294	1.000
须根鲜重	0.482	0.300	0.612^*	-0.132	-0.474	0.341	1.000
须根含水率	0.573^*	0.389	0.697^**	-0.158	-0.404	0.178	0.716^**	1.000
类胡萝卜素	0.393	0.457	0.137	-0.521^*	-0.728^**	-0.421	0.276	0.341	1.000
可溶性糖	0.733^**	0.579^*	0.725^**	-0.348	-0.586^*	-0.057	0.486	0.799^**	0.482	1.000