Effects of transplanting time and plant density on yield, quality and antioxidant content of onion (Allium cepa L.) in southern Italy
Effects of transplanting time and plant density on yield, quality and antioxidant content of onion (Allium cepa L.) in southern Italy
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DOI：
10.1016/j.scienta.2013.12.019
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发表时间：
2014-02-13
影响因子：
4.3
通讯作者：
Amalfitano, Carmine
中科院分区：
文献类型：
--
作者：
Caruso, Gianluca;Conti, Stefano;Amalfitano, Carmine
本研究的目的是评价四种移栽时期的效果（2月1日、2月16日、3月3日、3月18日）和三种植物密度（21.2、27.2和38.1 pt m（-2））对生长、生产力和鳞茎质量指标的影响（大小、干重、可溶性固形物含量、糖、酸、氨基酸、抗氧化剂、矿物质组成）。种球平均重量和直径从最早到最晚移植时间显著下降。种植密度对产量的影响不显著，但种植密度对产量的影响最大，（21.2 pt m（-2））产生的鳞茎尺寸最大。鳞茎品质指标对移植时间的反应不同：干重、葡萄糖、果糖、棉子糖、柠檬酸和苹果酸以及维生素C含量没有变化;可溶性固形物、蔗糖和草酸含量从2月1日到3月18日增加，而草酸、钙、氯化物和硝酸盐含量下降。移植时间的顺序导致复杂的模式的变化的矿物质成分和游离氨基酸含量的灯泡。鳞茎总多酚含量不随移植时间而变化，干重约为7 mg g（-1），外皮中多酚含量是内层新鲜鳞片的两倍以上。对“Ramata di Montoro”洋葱的研究表明，早期移植可增加鳞茎产量和大小，而后期移植可改善鳞茎质量的某些方面。(C)2014爱思唯尔有限公司版权所有。
The aim of this research was to evaluate the effects of four transplanting times (1 February, 16 February, 3 March, 18 March) and three plant densities (21.2, 27.2 and 38.1 pt m(-2)) on the growth, productivity and bulb quality indicators (size, dry weight, soluble solids content, sugars, acids, amino acids, antioxidants, mineral composition) of long-day onion crops, cultivar "Ramata di Montoro".Crop yield, bulb mean weight and calibre decreased significantly from the earliest to the latest transplanting time. Plant density did not affect production significantly but the most spaced crop (21.2 pt m(-2)) produced bulbs of the biggest size.The bulb quality indicators responded differently to transplanting time: dry weight, glucose, fructose, raffinose, citric and malic acids and vitamin C content did not change; soluble solids content, sucrose, and oxalic acid increased from the 1 February to the 18 March transplanting time, while pyruvic acid, calcium, chlorides and nitrates content decreased. The sequence of transplanting times resulted in complex pattern of variations of the mineral composition and of the free amino acid content of the bulbs. The bulb total polyphenol content did not vary with the transplanting time and it was about 7 mg g(-1) dry weight, with the outer skins containing more than double polyphenols compared to the inner fresh scales.This research on "Ramata di Montoro" onion has shown that early transplanting increases bulb yield and size, whereas some aspects of bulb quality improve with late transplants. (C) 2014 Elsevier B.V. All rights reserved.