Growth dynamics of reed canarygrass ( Phalaris arundinacea L.) and its allocation of biomass and nitrogen below ground in a field receiving daily irrigation and fertilisation

摘要: Biomass and nitrogen in the roots, rhizomes, stem bases litter of reed canarygrass (Phalaris arundinacea L.) were repeatedly estimated by soil coring, root growth dynamics this potential energy crop was studied for two years using minirhizotrons. Results are discussed relation to above-ground biomass fertilisation. Five treatments used: C0, unfertilised control; C1, fertilised with solid N fertiliser spring; I1, irrigated daily, as C1; IF1 , I1 daily through a drip-tube system; IF2, but higher rates. below-ground plant parts increased between first second years. Up 50% total recovered below-ground. The highest proportions found C0. calculated annual input via turnover ranged 80 235 g m-2. In absolute terms, up 1 kg 10 m-2 nitrogen, respectively, fractions. High inputs stubble accumulated will occur when ley is ploughed, which result highly positive carbon balance comparison that conventional crops such cereals.