Part 3 Plant Mineral Nutrition 3. 1 Overview of nitrogen in the biosphere and in plants
Part 3 Plant Mineral Nutrition 3.1 Overview of nitrogen in the biosphere and in plants
The nitrogen cycle Organic N Nitrogen fixation NH OH NO NO. NO
The nitrogen cycle
Nitrogen deficiency phenotype in leaves of sugar beet Nitrogen deficiency is often associated with uniform yellowing of older leaves
Nitrogen deficiency phenotype in leaves of sugar beet. Nitrogen deficiency is often associated with uniform yellowing of older leaves
Overview of N uptake by a nonnodulated plant (left) and by a nodulated plant with N-fixing symbionts(right) NO2→NH4+Amno Amino acid No2NH4→-Amin Amides ureides Vacuole Plastid NO2→NH4+-Amin Plastid acias NO A GIn NO3 Vacuole Root NO NHa Nodulated root
Overview of N uptake by a nonnodulated plant (left), and by a nodulated plant with N-fixing symbionts (right)
Table 3.1 Rates of natural and anthropogenic nitrogen fixation Se ource Amount of n fixed Lighting 10 Tg/year e Biological N-fixation in terrestrial systems 90-140 Tg/year o Biological N-fixation in marine systems 30-300 Tg/year e Nfertilizer synthesis 80 Tgye ear e Fossil fuel combustion 20 Tg/year g=1012
Table 3.1 Rates of natural and anthropogenic nitrogen fixation ⚫ Source Amount of N fixed ⚫ Lighting <10 Tg/year ⚫ Biological N-fixation in terrestrial systems 90-140 Tg/year ⚫ Biological N-fixation in marine systems 30-300 Tg/year ⚫ N fertilizer synthesis 80 Tg/year ⚫ Fossil fuel combustion >20 Tg/year ⚫ * Tg =1012 g