Agriculture and its impact on ecosystem A.Agricultural farmland as a unstable ecosystem: An agricultural ecosystem is established and manipulated by human beings in various ways to suit their own purposes, e.g . for food production. This ecosystem is unstable in many aspects: 1.Continual removal of soil mineral nutrients due to absorption by crops and weeds. Natural recycling of minerals is hindered as a result of harvesting and subsequent export of biomass from the ecosystem. 2.…showed first 75 words of 1799 total…

…showed last 75 words of 1799 total…practise: -crop rotation -mixed cropping à growing different species of crops in alternate rows so as to intersperse them and slow down the spread of pests. Advantages of biological control: (1)no pollution (2)once the host - parasite ( or predator and prey ) relationship is established , no further action is needed. (3)Those predator-prey, parasite and host relations are highly specific. Not affecting the useful crop plants. (4)Its' a relatively long term control. (5)Cheap (if successful) (6)Safe in action.