Nitrogen Nutrition and Plant Growth, eds H. S. SRIVASTAVA & R. P. SINGH. x+347 pp. Enfield: Science Publishers Inc. (1999). £52.00 (hardback). ISBN 1 57808 032 0.

2000 ◽  
Vol 135 (1) ◽  
pp. 95-100
Author(s):  
P. B. BARRACLOUGH
Keyword(s):  
Plant Growth ◽  
Nitrogen Nutrition

Amending aeolian sandy soil in the Mu Us Sandy Land of China with Pisha sandstone and increasing phosphorus supply were more effective than increasing water supply for improving plant growth and phosphorus and nitrogen nutrition of lucerne (Medicago sativa)

2020 ◽  
Vol 71 (8) ◽  
pp. 785
Author(s):  
Honghua He ◽  
Zekun Zhang ◽  
Rui Su ◽  
Zhigang Dong ◽  
Qing Zhen ◽  
...  
Keyword(s):  
Plant Growth ◽  
Water Supply ◽  
Medicago Sativa ◽  
Sandy Soil ◽  
Nitrogen Nutrition ◽  
Sandy Land ◽  
Retention Capacity ◽  
Mu Us Sandy Land ◽  
N Nutrition ◽  
P Supply

Plant growth is often constrained by low availability of water and phosphorus (P) in soils in arid and semi-arid areas. Aeolian sandy soils cover >90% of the sandy area of the Mu Us Sandy Land (MUSL) in Northwest China. These soils have low water- and nutrient-retention capacity, limiting their ability to support plant growth. Pisha sandstone, a type of loose rock widely distributed in the MUSL, is regarded as an environmental hazard because it easily weathers, resulting in severe soil erosion and water loss. However, the retention capacity of the aeolian sandy soil can be significantly improved through blending with Pisha sandstone. We investigated the impacts of water supply (35% and 70% of soil water-holding capacity) and P supply (0, 5 and 20 mg P kg–1 soil) on plant growth and P and nitrogen (N) nutrition by growing lucerne (Medicago sativa L.) in MUSL aeolian sandy soil amended or not with Pisha sandstone. Soil type and P supply had greater effects than water supply on lucerne growth and on P and N nutrition. Biomass accumulation and shoot P and N concentrations were increased by amending the aeolian sandy soil with Pisha sandstone and increasing P supply. The N:P ratios in shoots indicated that plant growth was limited by P but not by N. Aeolian sandy soil amended with Pisha sandstone and supplied with P at 5 mg kg–1 enhanced lucerne growth; this practice is feasible for pasture development in the MUSL.

Defoliation, Nitrofen, and Competition: Effects on Plant Growth and Nitrogen Nutrition

Ecology ◽  
1989 ◽  
Vol 70 (3) ◽  
pp. 721-727 ◽  
Author(s):  
H. Wayne Polley ◽  
James K. Detling
Keyword(s):  
Plant Growth ◽  
Nitrogen Nutrition ◽  
Competition Effects

scholarly journals Ethylene Evolution by Tomato Plants Receiving Nitrogen Nutrition from Urea

HortScience ◽  
1990 ◽  
Vol 25 (4) ◽  
pp. 420-421 ◽  
Author(s):  
Allen V. Barker ◽  
Kenneth A. Corey
Keyword(s):  
Plant Growth ◽  
Nitrogen Nutrition ◽  
Ethylene Evolution ◽  
Soil Culture ◽  
N Transformations ◽  
Relative Growth ◽  
Tomato Plants ◽  
The Media ◽  
Nutrient Solutions ◽  
Urea Fertilization

Urea fertilization of `Heinz 1350' tomato (Lycopersicon esculentum Mill.) in sand or soil culture did not enhance ethylene evolution or restrict growth relative to plants receiving \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathbf{NO}_{\mathbf{3}}^{\mathbf{-}}\) \end{document} whereas \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathbf{NO}_{\mathbf{4}}^{\mathbf{+}}\) \end{document} nutrition doubled the relative rates of ethylene evolution and restricted relative growth. Inhibitors of N transformations in media (nitrapyrin, Np; hydroquinone, HQ; and phenylphosphorodiamidate, PPD) had no apparent stimulator effects on ethylene evolution of plants grown on urea or \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathbf{NO}_{\mathbf{3}}^{\mathbf{-}}\) \end{document} nutrition in sand or soil. Ethylene evolution was enhanced by PPD relative to that by Np or HQ for plants receiving \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathbf{NO}_{\mathbf{4}}^{\mathbf{+}}\) \end{document} nutrition. Each inhibitor had toxic effects on plant growth. Increasing K+ supply from 0 to 8 mm in nutrient solutions decreased ethylene evolution and increased plant growth with urea fertilization. Urea had low phytotoxicity if its hydrolysis to \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathbf{NO}_{\mathbf{4}}^{\mathbf{+}}\) \end{document} was prevented in the media. Chemical names used: p-dihydroxybenzene (hydroquinone); benzenephosphorodiamide (phenylphosphorodiamidate); 2-chloro-6-(trichloromethyl)pyridine (nitrapyrin).

The importance of nitrate in ameliorating the effects of ammonium and urea nutrition on plant development: the relationships with free polyamines and plant proline contents

2005 ◽  
Vol 32 (11) ◽  
pp. 1057 ◽  
Author(s):  
Fabrice Houdusse ◽  
Angel M. Zamarreño ◽  
Maria Garnica ◽  
Josemaria García-Mina
Keyword(s):  
Plant Growth ◽  
Plant Species ◽  
Nutrient Solution ◽  
Nitrogen Nutrition ◽  
Specific Effect ◽  
Ammonium Assimilation ◽  
Negative Effects ◽  
Ammonium Accumulation ◽  
Free Polyamines ◽  
Specific Pathway

In order to investigate the possible involvement of free polyamines and proline in the mechanism underlying the action of nitrate in correcting the negative effects associated with ammonium and urea nutrition in certain plant species, we studied plant contents of free polyamines and proline associated with nitrogen nutrition involving different nitrogen forms (nitrate, ammonium, urea) in two plant species, wheat and pepper. The results showed that ammonium nutrition and, to a lesser extent, urea nutrition were associated with significant increases in plant putrescine content that were well correlated with reductions in plant growth. These negative effects of ammonium and urea nutrition were corrected by the presence of nitrate in the nutrient solution; the presence of nitrate was also related to a significant decrease in the plant putrescine content. These results are compatible with a specific effect of nitrate reducing ammonium accumulation through the improvement of ammonium assimilation. As for the plant proline content, in pepper a slight increase in this parameter was associated with ammonium and urea nutrition, but it was also decreased by the presence of nitrate in the nutrient solution. These changes, however, were not so clearly related to the variations in plant growth as in the case of putrescine content. These results are compatible with the hypothesis that putrescine biosynthesis might be related to proline degradation by a specific pathway related to ammonium detoxification.

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