The growth dynamics in Brachiaria species according to nitrogen dose and shade

Revista Brasileira de Zootecnia

Domingos Sávio Campos Paciullo²  Priscila Beligoli Fernandes¹  Carlos Augusto De Miranda Gomide²  Carlos Renato Tavares De Castro²  Fausto De Souza Sobrinho²  Carlos Augusto Brandão De Carvalho¹ 

[1] ,Embrapa Gado de LeiteJuiz de Fora MG

关键词: Brachiaria brizantha;    Brachiaria decumbens;    Brachiaria ruziziensis;    morphogenesis;    silvopastoral system;    tillering;    Brachiaria brizantha;    Brachiaria decumbens;    Brachiaria ruziziensis;    morfogênese;    perfilhamento;    sistema silvipastoril;   

DOI  :  10.1590/S1516-35982011000200006

来源: SciELO

【 摘 要 】

It was studied the effects of shading (0, 36 and 54%) and of four nitrogen doses (0, 50, 100 and 150 mg N/dm³ of soil) on the morphogenetic traits and on the tillering of grasses of Brachiaria genus (B. decumbens, B. ruziziensis and B. brizantha cv. Marandu and cv. Xaraes), cultivated in pots with 5 kg substrate. It was used a complete random design, in a 3 × 4 × 4 factorial scheme with three replications. Nitrogen promoted increase in leaf appearance rate and in average leaf blade length, whereas shading increased stem elongation rate. Leaf elongation rate and tillering varied with the interaction among shading percentages and nitrogen doses. Shading increased response efficiency of leaf elongation rate to nitrogen doses, but reduced for tillering, evidencing priority existing tillering growth in detriment to appearance of new tillers when there is light restriction for the plants. Phenotypic adjustments, in response to light reduction, indicate that the studied grasses present tolerance to moderate shading.

【 授权许可】

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