Condition of Quercus robur L. along a natural Luvisol microtoposequence on loess in Central Belgium

Abstract. This research aims to assess how the variability in soil morphology of Luvisols along a microtopographic sequence influences the condition of pedunculate oak ( Quercus robur ). The condition of 205 pedunculate oaks was observed during one growth season and related to morphological soil properties. Results show that the presence of a consolidated argillic B horizon or fragipan in Luvisols, has a negative influence on the condition of Q.robur .     

A case of chronic zinc poisoning in calves fed with zinc-contaminated roughage

A case of zinc intoxication in young female cattle is described. The clinical signs consisted of reduced appetite, emaciation, submandibular oedema and diarrhoea. The source of zinc proved to be roughage harvested in the vicinity of a factory galvanizing steel tubes. In this roughage zinc levels between 3000 and 7300 mg/kg dry weight were found. In the liver of four animals zinc levels varied between 420 and 1600 mg/kg, and between 910 and 1680 mg/kg dry weight in the kidneys.     

世界银行倡导以农业促发展

当今世界的农业发展概况 当今世界的农业,广袤、多样且快速变化.如果地方层面、国家层面乃至全球层面都有健全的政策和支持性投入,今天的农业将为数以亿计的农村穷人摆脱贫困提供新的契机.农业向他们敞开脱贫道路包括家庭种植业和养殖业、高附加值的"新型农业"就业机会、新兴的农村非农产业创业和就业机会等等.