Effect of Nitrogen and Trinexapac-Ethyl Rates on the SPAD Index of Wheat Leaves

被引：16

作者：

Espindula, Marcelo Curitiba ^{[1
]}

Rocha, Valterley Soares ^{[1
]}

Rezende Fontes, Paulo Cezar ^{[1
]}

Correa da Silva, Raul Carvalho ^{[1
]}

de Souza, Leandro Torres

机构：

[1] Univ Fed Vicosa, Dept Fitotecnia, BR-36570000 Vicosa, MG, Brazil

来源：

JOURNAL OF PLANT NUTRITION | 2009年 / 32卷 / 11期

关键词：

Triticum aestivum; diagnosis; chlorophyll; green; CHLORMEQUAT CHLORIDE; MEPIQUAT CHLORIDE; GROWTH; CULTIVARS;

D O I：

10.1080/01904160903245113

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The objective of this studywas to evaluate the effect of nitrogen (N) and trinexapac-ethyl (TE) rates on the SPAD index in wheat flag leaf. The treatments were five N rates (30, 60, 90, 120, 150 kg ha(-1)) combined with four TE rates (0, 63, 125, 188 g ha(-1)). The experiment was carried out in a randomized block design with four repetitions. SPAD index, leaf N content and grain yield showed quadratic response to the increase in N rates, whereas area, wet and dry weight of flag leaf presented linear increase. TE caused linear increase in SPAD index, linear decrease in leaf area, reduction in grain yield with smaller N rates and increase with larger N rates. The N content, and the wet and dry weight of flag leaf were not affected by TE. SPAD calibration to estimate N status in wheat should be specific for each TE rate.

引用

页码：1956 / 1964

页数：9

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