3,5,6-trichloro-2-pyridinyloxyacetic acid as effective thinning agent for fruit of 'Montenegrina' mandarin
3,5,6-trichloro-2-pyridinyloxyacetic acid as effective thinning agent for fruit of 'Montenegrina' mandarin
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3,5,6-三氯-2-吡啶氧基乙酸作为“黑山”柑橘果实的有效疏果剂
DOI：
10.1590/0103-8478cr20140057
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Schwarz
中科院分区：
文献类型：
--
作者：
M. P. Gonzatto;Gerson Nestor Böettcher;L. Schneider;Ângelo Azeredo Lopes;Jairo Camargo Silveira Júnior;Henrique Belmonte Petry;Roberto Pedroso de Oliveira;S. Schwarz
“黑山”柑橘（Citrus deliciosa Tenore）在巴西南部广泛种植。这个品种有互生结果的倾向，需要削薄果实。然而，化学稀释剂的研究，直到现在在这个品种还没有成功。本研究的目的是评估3，5，6-三氯-2-吡啶氧基乙酸（3，5，6-TPA）对'黑山'柑橘的产量和果实品质的影响，与人工疏果和化学疏果的选择相比，以前的研究。手工疏伐和不疏伐作为对照。乙烯利200 mg L ~（-1）、300 mg L ~（-1）或200 mg L ~（-1）+3%尿素3种剂量; 3，5，6-TPA 10、20、30、40 mg L ~（-1）4种剂量。结果表明，人工疏果和40 mg L ~（-1）处理的果实平均大小、商品径分布和橙子色均较好。无治疗减少交替轴承。用40 mg·L ~（-1）的3，5，6-TPA作化学稀释剂，在幼果生理落果期进行疏果，对‘黑山’蜜柑的产量和品质有类似的效果。
The 'Montenegrina' mandarin ( Citrus deliciosa Tenore) is widely cultivated in southern Brazil. This cultivar has a great tendency for alternate bearing, requiring thining of the fruit. However, the chemical thinners studied until now in this cultivar have not been successful. The objective of this research was to evaluate the effect of 3,5,6-trichloro-2-pyridinyloxyacetic acid (3,5,6-TPA) on the production and fruit quality of the 'Montenegrina' mandarin, in comparison with hand thinning and the options of chemical thinning previously studied. Hand thinning and no thinning were used as controls. Ethephon was applied in three doses: 200mg L-1, 300mg L-1 or 200mg L-1 + 3% urea; or 3,5,6-TPA, in four doses: 10, 20, 30 or 40mg L-1. Fruits of the hand thinned trees and those treated with 40mg L-1 showed greater average size, greater distribution of commercial caliber and more orange colors. No treatment reduced alternate bearing. Applications of 40mg L-1 of 3,5,6-TPA as a chemical thinner, during the physiological drop of young fruit, had a similar effect that of hand thinning over yield and quality of fruits of 'Montenegrina' mandarin.