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  • Title: [Effects of purified humic acid on growth and nutrient absorption of cucumber (Cucumis sativus)seedlings under low nitrogen stress.].
    Author: Gu DY, Wang XF, Yang FJ, Jiao J, Wei M, Shi QH.
    Journal: Ying Yong Sheng Tai Xue Bao; 2016 Aug; 27(8):2535-2542. PubMed ID: 29733141.
    Abstract:
    Taking 'Xintaimici' and 'Jinyou 1' as experimental cucumber cultivars, this paper studied the effects of watering purified humic acid (PHA) at different levels (0, 50, 100, 150, 200 mg·L-1) on growth and nutrient absorption of cucumber seedlings under low nitrogen stress (1 mmol·L-1 NO3-) in sand culture pots. The results showed that, under low N condition, PHA could significantly increase the total root length, root surface area, root tip number and root volume of cucumber seedlings, and promote plant height, stem diameter and leaf area. Proline and soluble sugar contents in cucumber leaves were significantly increased by PHA. The absorption of N, P, K, Ca, Mg, Fe in cucumber seedlings was promoted. According to the response of the two cucumber cultivars to PHA under low N stress, some traits of two cultivars showed different sensitivity to PHA level. The comprehensive analysis of the above results inferred that the PHA level from 100 mg·L-1 to 150 mg·L-1 could significantly enhance the growth and nutrient absorption of cucumber seedlings. 以黄瓜‘新泰密刺’、‘津优1号’为供试品种,研究沙培条件下不同浓度(0、50、100、150、200 mg·L-1)纯化腐植酸(PHA)浇灌对低氮胁迫(1 mmol·L-1 NO3-)下黄瓜幼苗生长及养分吸收的影响.结果表明: 在较低N供应条件下,沙培浇灌PHA可显著增加黄瓜幼苗的根总长、根表面积及根尖数,增大根体积,促进黄瓜幼苗株高和茎粗生长,增大叶面积;显著提高黄瓜幼苗叶片中脯氨酸及可溶性糖含量;促进N素以及P、K、Ca、Mg、Fe元素的吸收.由参试两黄瓜品种对低氮胁迫下PHA处理响应效果来看,不同品种的某些性状对PHA处理浓度的敏感程度稍有差异,综合结果显示,施用100～150 mg·L-1PHA可显著促进两品种幼苗生长及养分吸收.
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