Nitrogen concentration % N in root and shoot biomass of lettuce plants and plant N uptake at the end of intensive plant growth second sampling day 44 Plants were cultivated in control soil without any amendment C in soil amended with 100 μg urea N g −1 U with biochar B and biochar and 100 μg urea N g −1 B U
Bacteria play an important role in pollutant transformation in activated sludge based wastewater treatment plants WWTPs Exploring the microbial community structure and diversity is essential to improving the performance of wastewater treatment processes This study employed Illumina MiSeq high throughput sequencing to investigate the microbial community
Introduction Nitrogen N is an essential nutrient for plant growth and survival and is also an important element limiting productivity in most terrestrial ecosystems Xu et al 2020; Xu and He 2020 How to allocate N among different plant organs is as fundamental as resource acquisition by the plant affecting material and energy cycles in ecosystems
By increase in N concentration from 5 to 10 and 15 respectively the increase in partitioning of biomass to leaves were recorded as 7% and 38% in plants under 75 µmol m −2 s −1 38% and 17%
Suitable concentrations of nitrogen and phosphorus can promote plant growth The low concentration of nitrogen and phosphorus in wastewater will lead to the nutrient deficiency of aquatic plants and then affect the growth of aquatic plants However high concentrations of nitrogen and phosphorus also inhibit the growth of aquatic plants Li et
The occurrence of nitrogen isotope discrimination with absorption and assimilation of nitrate NO 3 and ammonium NH 4 was investigated using two genotypes of barley Hordeum vulgare L cv Steptoe and Az12 Az70 the latter of which lacks the characterized nitrate reductase isozymes Plants were grown under two situations a closed
Plant absorb most of their nitrogen in the form of nitrate nitrogen NO 3 − N or ammonium nitrogen NH 4 N although some can directly absorb amino acids and organic nitrogen such as urea Azcón et al 1992 Because these different forms of nitrogen have differing effects on plant growth and photosynthesis Clarkson 1980 the type of nitrogen
Leaf nitrogen N and phosphorus P concentrations are two of the key leaf traits which play crucial roles in ecosystem function and dynamics Chapin et al 2002 Sterner and Elser 2002 As one of the major limiting elements for plant growth leaf N concentration is tightly linked to many ecosystem processes such as photosynthetic rate plant productivity
We conducted a meta analysis of 127 publications to synthesize the pathways underlying the responses of plant nutrient concentration and resorption to N addition across global grassland ecosystems
While there is little FACE data available on effects of elevated CO 2 on plant nitrogen and protein concentrations data from chamber experiments shows C 4 plants to be much less responsive than C
Concentration and Translocation of Nitrogen Compounds in the Corn Plant Zea Mays During Grain Development 1 R E Hay 2 E B Earley PHYSIOLOGICAL ROLE OF ASPARAGINE AND RELATED SUBSTANCES IN NITROGEN METABOLISM OF PLANTS Plant Physiol 1935 Jul; 10 3 447 464 [PMC free article] [Google Scholar] Sayre JD MINERAL
In plants nitrate and ammonium are two major inorganic N source For nitrate after uptake from root it is first reduced into nitrite by nitrate reductase NR in cytoplasm then nitrite is transported into plastid and reduced into ammonium by plastidic nitrite reductase NiR Fig 1 A Members of NR reported in different plants are varied with two in Arabidopsis three
Synthesis of existing data showed an average 14% reduction of N concentrations in plant tissue generated under elevated CO 2 regimes However elevated CO 2 appeared to have different effects on the N concentrations of different plant types as the reported reductions in N have been larger in C3 plants than in C4 plants and N 2 fixers
ABSTRACT The effect of salt stress on the concentrations of nitrogen N phosphorous P potassium K calcium Ca magnesium Mg and sodium Na in the young and mature leaves the shoots and the roots of six major Greek olive cvs Koroneiki Mastoidis Kalamon Amphissis Kothreiki and Megaritiki was investigated on self rooted one year old
Precision agriculture enables the assessment of plant nitrogen supply at the right time and in optimal amounts ensuring high nitrogen use efficiency while minimizing environmental pollution caused by excessive fertilizer applications However there have been limited studies on critical nitrogen concentration in horticultural crops
This work measured leaf N and P concentrations of 386 woody species at 14 forest sites across eastern China and explored the effects of climate soil and plant growth form on leaf N P and N P ratios Leaf chemistry is important in predicting the functioning and dynamics of ecosystems As two key traits leaf nitrogen N and phosphorus P concentrations set the
The results show that nutrient concentrations in leaves are less responsive to abiotic environments than those in woody stems and roots stable leaf nutrient concentration hypothesis and the relationships between vegetation primary productivity and leaf nutrient contents are stronger when less nutrients are allocated to the woody tissues
This phenomenon can be simply explained as that nitrogen application significantly increases the availability of soil nitrogen Ladwig et al 2011; Fu and Shen 2017 which extensively promotes the nitrogen concentration of plants and the growth of plants will lead to the increase of biomass thus diluting the phosphorus concentration of
The leaf N and P concentrations of A sparsifolia at all groundwater depths were the highest in June but these concentrations significantly decreased from July to October Figures 3C F The leaf C N and C P mass ratios increased as the growing season continued Figures 3G J The leaf C and N P mass ratios were relatively stable in the growing seasons in
Changes of plant relative biomass Increasing N addition decreased species richness in the semiarid grassland At species level the relative biomass of L chinensis greatly increased along N addition gradient while that of C glaucum first increased and then decreased Nitrogen addition decreased the relative biomass of S grandis and A sibiricum and did not
This review examines how nitrogen and phosphorus concentration and the N P ratio in wetland plants vary among species and sites and how they are related to nutrient availability and limitation We analyse data from field studies in European non forested wetlands from fertilisation experiments in these communities and from growth experiments
The efficient use of nitrogen N is essential for plants as it is one of the most limiting factors for plant growth Pellegrini 2016 Plant nitrogen use efficiency NUE is defined as the net dry mass production per unit of N uptake which is extensively employed for research into plant N use strategies Hirose 2011 Plants with higher NUE can better integrate limited N
Potassium K is a vital macronutrient and has significant roles in plants like osmoregulation membrane potential regulation cotransport of sugars stress adaption and growth Sanyal et al 2020; Sardans and Peñuelas 2021 Multiple types of transport occur for the transport of potassium ion K but their regulation under low and high content in external
