Weed suppression by cover crops soil

Planta Daninha

Mateus, G.P.¹  Instituto Agronômico, Votuporanga, Brasil¹  Universidade Estadual Paulista, Ilha Solteira, Brasil¹  Borges, W.L.B.¹  Freitas, R.S.¹  Sá, M.E.¹  APTA - Polo Regional Extremo Oeste, Andradina, Brasil¹  Alves, M.C.¹ 

关键词: Sorghum bicolor;    Pennisetum americanum;    Sorghum sudanense;    Urochloa ruziziensis;    germination;    sowing density.;   

DOI  :  10.1590/S0100-83582014000400010

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

This study aimed to evaluate soil cover and the suppressive effect on weeds by different cover crops at different seed densities. The experiments were set up in Votuporanga, state of São Paulo, Brazil and in Selvíria, state of Mato Grosso do Sul, Brazil, in March 2008, after conventional tillage. The experimental design was a randomized complete block with four replications, using the following cover crops at different seed densities per hectare: Sorghum bicolor : 6, 7 and 8kgha-1, Pennisetum americanum, 10, 15 and 20 kg ha-1, Sorghum sudanense, 12, 15 and 18kgha-1, hybrid of Sorghum bicolor with Sorghum sudanense: 8, 9 and 10kgha-1, Urochloa ruziziensis: 8, 12 and 16kgha-1. A control treatment with spontaneous vegetation was used. Soybean was sown after the management of cover crops. Dry matter and weed density were evaluated at cutting/harvesting of cover crops. In Votuporanga, another assessment of weed plants was made at 35 days after soybean had been sown. The ground cover provided by cover crops was assessed at the time of desiccation and flowering of soybeans. It was concluded that U. ruziziensis and S. sudanense reduced weed infestations by more than 90% and kept ground cover above 80% by the time of flowering of soybean.

【 授权许可】

Unknown