Silicon accumulation and water deficit tolerance in Brachiaria grasses

Scientia Agricola

Suzana Pereira De Melo²  Gaspar Henrique Korndörfer¹  Clotilde Maria Korndörfer¹  Regina Maria Quintão Lana¹  Denise Garcia De Santana¹ 

[1] ,Universidade de São Paulo Escola Superior de Agricultura Luíz de Queiróz Programa de Pós-Graduação em Solos e Nutrição de PlantasPiracicaba SP ,Brasil

关键词: calcium silicate;    pasture;    water stress;    soil moisture;    silicato de cálcio;    pastagem;    estresse;    umidade do solo;   

DOI  :  10.1590/S0103-90162003000400022

来源: SciELO

【 摘 要 】

The beneficial effects of silicon (Si) fertilization have been observed for several plant species, especially when submitted to stress, either biotic or abiotic. Among the possible reasons for the greater adaptability and resistance of brachiaria grass in areas of low fertility soils in Brazilian savanna, stands its capacity of absorbing and accumulating Si in aerial parts. To evaluate the effect of Si on dry matter yield of Brachiaria decumbens Stapf and Brachiaria brizantha Hochst, grown under two soil moisture regimes, a trial was set up in a completely randomized design factorial scheme (5 × 2 × 2), with five Si rates: (0; 242; 484; 968 and 1,452 kg ha-1), two soil water tensions (60% and 80% of field capacity) and the two brachiaria species. The experiment was installed in a greenhouse, using one of the most representative soils in the region under cerrado, Typic Haplustox. Both brachiaria species can be considered Si-accumulating plants, since they present high Si contents in their aerial parts. Application of Si to the soil increased the contents of this element in both grass species but did not change their tolerance to water deficit, and did not affect dry matter yield.

【 授权许可】

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