The Effects of Nitrogen Source and Concentration on the Growth and Mineral Composition of Privet

Stratton, Margie Lynn; Good, George L.; Barker, Allen V.

doi:10.1081/pln-100107310

Cited by 23 publications

(19 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Usually, in hydroponic culture in a greenhouse, maximum growth and yield of tomato or pepper is obtained with an optimal NH 4 + concentration not exceeding 30% of total N (Takács and Técsi 1992;Sandoval-Villa et al 2001;Claussen 2002;Xu et al 2001Xu et al , 2002. The superiority of mixed N forms to either form alone is related to the maintenance of nearly neutral pH (Marschner 1995), higher uptake of phosphorous, potassium, calcium and iron, etc., in mixed N forms than with either single NO 3 − or NH 4 + (Stratton et al 2001;Zou et al 2005;Kotsiras et al 2002), avoiding excessive consumption of carbohydrate upon NH 4 + assimilation at the expense of root growth (Schortemeyer et al 1993;Schortemeyer and Feil 1996;Salsac et al 1987), and cytokinin (CTK) enhancement (Smiciklas and Below 1992;Fetene and Beck 1993;Wang and Below 1996). Cytokinin is widely accepted as a long-range signal in response to NO 3 − for regulation of leaf growth at the whole plant level Rahayu et al 2005;Takei et al 2002).…”

Section: Introductionmentioning

confidence: 96%

“…The optimal proportions of NO 3 − to NH 4 + for plant growth depend on plant species, environmental conditions, developmental stage and the total concentration of supplied nitrogen (N) (Chaillou et al 1991;Xu et al 1992;Stratton et al 2001;Zou et al 2005;Kotsiras et al 2002;Xu et al 2001Xu et al , 2002Claussen 2002). Usually, in hydroponic culture in a greenhouse, maximum growth and yield of tomato or pepper is obtained with an optimal NH 4 + concentration not exceeding 30% of total N (Takács and Técsi 1992;Sandoval-Villa et al 2001;Claussen 2002;Xu et al 2001Xu et al , 2002.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of different nitrogen forms on the growth and cytokinin content in xylem sap of tomato (Lycopersicon esculentum Mill.) seedlings

Shen

et al. 2008

Plant Soil

View full text Add to dashboard Cite

In order to investigate the effects of homogeneous and localized supply of different nitrogen forms (nitrate, NO 3 − vs ammonium, NH 4 + ) on the growth of tomato seedlings, root morphology and six cytokinin (CTK) fractions in xylem sap were analyzed. Whole roots were supplied with different ratios of NO 3 − to NH 4 + (100:0, as 100-0NA; 75:25, as 75-25NA; 50:50, as 50-50NA) under homogeneous supply. In split-root experiments, three treatments were compared: a sole NO 3 − supply (N|N), a spatially separated supply of NO 3 − and NH 4 + (N|A), and a spatially separated supply of NO 3 − and a mixture of NO 3 − and NH 4 + nutrition at a ratio of 75:25 (N|AN). All concentrations of total N were set at 5 mM. The results showed that (1) homogeneous 75% NO 3 − plus 25% NH 4 + supply to the whole root zone led to maximum shoot and root dry matter (DM), root surface area (RS) and root volume (RV). The spatially separated supply of NO 3 − and NH 4 + (N|A) resulted in a contrasting effect on root morphology: in comparison to N|N, root DM in the NO 3 − -containing pot was increased by 50% whereas it was depressed by 50% in the NH 4 + -containing pot. The 75% NO 3 − plus 25%NH 4 + supply in the split-root experiment led to no significant effects either on shoot DM and root DM, or on RS and RV when compared to N|N. (2) The presence of NH 4 + in the external medium led to a significantly reduced total xylem-CTK concentration, and a close negative correlation was found between xylem NH 4 + and total CTK concentration irrespective of culture mode. A relatively high level of zeatin riboside (ZR) was maintained both in 75-25NA and N|A treatments. It was concluded that, in addition to the percentage of NH 4 + to NO 3 − in the nutrient solution, whether NH 4 + was supplied to the whole root system or to only part of the root system was also an important factor affecting plant growth. The fact that the 75-25NA and N|A treatments resulted in optimal growth of tomato seedlings might be attributed to the higher ZR concentration in xylem.

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Effects of different nitrogen forms on the growth and cytokinin content in xylem sap of tomato (Lycopersicon esculentum Mill.) seedlings

Shen

et al. 2008

Plant Soil

View full text Add to dashboard Cite

show abstract

“…The effects of NO − 3 -N/NH + 4 -N ratios on plant growth vary with plant species (Stratton et al, 2001;Alan, 1989;Santamaria et al, 1999;Cao and Tibbitts, 1993). Stratton et al (2001) found that privet (Ligustrum ibolium) fertilized with NH + 4 -N or a mixture of NO − 3 -N and NH + 4 -N contained higher phosphorus (P) concentration in leaves, stems, and roots and higher N in leaves than that supplied with NO − 3 -N, and that plants supplied with NO − 3 -N alone had more potassium (K) in leaves than plants supplied with sole or partial NH + 4 -N. An increasing proportion of NH + 4 -N significantly increased N concentrations in taro leaf, while P and K concentrations in leaf blades were not significantly affected (Osorio et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Growth, Nitrate Accumulation, and Macronutrient Concentration of Pakchoi as Affected By External Nitrate-N: Amino Acid-N Ratio

Wang

Zhu

et al. 2008

Journal of Plant Nutrition

View full text Add to dashboard Cite

A study was carried out to determine the influence of nitrogen (N) sources on the growth, nitrate (NO − 3 ) accumulation, and macronutrient concentrations of pakchoi (Brassica chinensis L.) in hydroponics. Plants were supplied with NO − 3 and two amino acids (AA), glutamic acid (Glu), and glutamine (Gln), at six NO − 3 -N/AA-N molar ratios: (1) 100:0, (2) 80:20, (3) 60:40, (4) 40:60, (5) 20:80, (6) 0:100. The total N concentration was 12.5 mmol/L for all treatments in nutrient solutions. Both AAs reduced plant growth with decreasing NO − 3 -N/AA-N ratios, but the reduction was for Gln than for Glu. At 80:20 NO − 3 -N: Gln-N ratio, the Gln had no significant effect on pakchoi fresh weights. Decreasing NO − 3 -N/AA-N ratios reduced NO − 3 concentrations in the plant, regardless of AA sources. Adding an appropriate portion of AA-N to nutrient solutions for hydroponic culture increased concentrations of N, phosphorus (P), and potassium (K) in pakchoi shoots. Substituting 20% or less of NO − 3 -N with Gln-N in hydroponic culture will increase the pakchoi quality by reducing NO − 3 concentration and increasing mineral nutrient concentrations in shoots without significant reduction of crop yields.

show abstract

“…Ammonium N had a strong effect on root morphology by increasing root diameter and the amount of secondary xylem with large tracheary elements. Some plant species do well with either the NH + 4 -N or NO − 3 -N sources alone (Conover and Poole, 1986;Stratton et al, 2001). Epstein and Bloom (2005) have suggested that NO − 3 -N assimilation is competitive with CO 2 .…”

Section: Introductionmentioning

confidence: 96%

Nitrogen Source and Concentration Affect Growth and Performance of Bedding-Plant Impatiens

Romero

Taber

Gladon

2006

Journal of Plant Nutrition

View full text Add to dashboard Cite

Impatiens (Impatiens wallerana Hook. f.) is the most important annual bedding plant in the United States, based on wholesale dollar volume. Production of high-quality plants requires optimization of the nutrition regimen during growth, especially the total nitrogen (N) concentration and the ratio of N sources. The objective was to determine the N concentration and the nitrate (NO − 3 -N):ammonium (NH + 4 -N) ratio of N source that optimized bedding-plant impatiens growth and flower development. Four N concentrations (3.5, 7, 10.5, and 14 mmol N · L −1 ) were used in factorial combination with four ratios of NO − 3 -N : NH + 4 -N (4:0, 3:1, 1:1, and 1:3). Application of treatments was made for 30 d. Then for 10 d only deionized water was applied to reduce salt buildup. Substrate pH was lowest (4.9) with the NH + 4 -N source and electrical conductivity (EC) highest, but never > 2.4 dS m −1 . Nitrogen concentration and N source displayed an interaction for most growth parameters. Shoot fresh and dry weights and flower bud number were maximized at the 1:3 NO − 3 -N : NH + 4 -N ratio with a N concentration of 10.5 mmol L −1 . However, plant diameter, leaf number, and leaf chlorophyll content responded quadratically to N form ratio, with the 1:1 ratio optimum at a concentration of 10.5 mmol N · L −1 .

show abstract

The Effects of Nitrogen Source and Concentration on the Growth and Mineral Composition of Privet

Cited by 23 publications

References 36 publications

Effects of different nitrogen forms on the growth and cytokinin content in xylem sap of tomato (Lycopersicon esculentum Mill.) seedlings

Effects of different nitrogen forms on the growth and cytokinin content in xylem sap of tomato (Lycopersicon esculentum Mill.) seedlings

Growth, Nitrate Accumulation, and Macronutrient Concentration of Pakchoi as Affected By External Nitrate-N: Amino Acid-N Ratio

Nitrogen Source and Concentration Affect Growth and Performance of Bedding-Plant Impatiens

Contact Info

Product

Resources

About