biológia 1 [vynechat] damage to soils 1 [vynechat] ekológia pôdy 1 [vynechat] humus 1 [vynechat] poškodenie pôdy 1 [vynechat] pôda 1 [vynechat] pôdna biológia 1 [vynechat] pôdne organizmy 1 [vynechat] soil 1 [vynechat] soil biology 1 [vynechat] soil ecology 1 [vynechat] soil organisms 1 [vynechat] soil properties 1 [vynechat] soil use 1 [vynechat] učebnice 1 [vynechat] vlastnosti pôdy 1 [vynechat] využitie pôdy 1 [vynechat]