How silicon fertilizer improves nitrogen and phosphorus nutrient availability in paddy soil?

To determine how soil nutrient availability influences nutrient cycling, fluxes of nutrients through litterfall and decomposition were determined for four forest stands similar in all respects except soil nutrient availability and microclimate, within Neotoma Valley, a small watershed in southern Ohio, U.S.A. Litterfall varied from 10 to 60% among sites while nutrient concentrations and masses in new leaf litter varied as a function of extractable soil nutrient levels. Mass loss from litterbags was significantly higher in more fertile sites. Stepwise regression indicated that initial litter nitrogen and phosphorus concentrations were strongly correlated with relative decomposition rate while lignin concentration and microclimate variables were only correlated weakly. Thus, both litterfall nutrient transfers and decomposition rates were under the control of soil nutrient levels. Nitrogen was immobilized in litter at all sites during the 1st year of decay; litter from more fertile sites mineralized nitrogen during the 2nd year, while that from less fertile sites continued to immobilize nitrogen. Phosphorus and calcium mineralization rates were strongly correlated with the availability of these elements in the soil. Magnesium and potassium were leached rapidly from litter; amounts mineralized were correlated with amounts in litterfall. Interrelations among soil fertility, litterfall, and nutrient mineralization, as well as litter redistribution, are discussed as processes important in the development and maintenance of the soil fertility gradient in this watershed.

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Nitrogen and phosphorus stoichiometry of common reed (Phragmites australis) and its relationship to nutrient availability in northern China

Aquatic Botany ◽

10.1016/j.aquabot.2013.08.002 ◽

2014 ◽

Vol 112 ◽

pp. 84-90 ◽

Cited By ~ 32

Author(s):

Liping Li ◽

Stefan Zerbe ◽

Wenxuan Han ◽

Niels Thevs ◽

Weiping Li ◽

...

Keyword(s):

Phragmites Australis ◽

Nutrient Availability ◽

Northern China ◽

Common Reed ◽

Nitrogen And Phosphorus

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Females and hermaphrodites of the gynodioecious Geranium maculatum respond similarly to soil nutrient availability

10.1101/2020.08.21.261305 ◽

2020 ◽

Author(s):

Katharine Putney ◽

Mavis Wolf ◽

Chase Mason ◽

Shu-Mei Chang

Keyword(s):

Nutrient Availability ◽

Natural Populations ◽

Soil Nutrient ◽

Nitrogen And Phosphorus ◽

Soil Nutrient Availability ◽

Leaf Quality ◽

Nitrogen Levels ◽

Growth Allocation ◽

Leaf Chlorophyll ◽

Growth And Allocation

AbstractSexual dimorphism in plant growth and/or reproductive responses to the surrounding environment has been documented in some plant species. In gynodioecious plants, it is especially important to understand whether females and hermaphrodites differ in their response to environmental stressors, as the fitness of females relative to hermaphrodites determines the extent to which these separate sexes are maintained in natural populations. Soil nutrient availability is of particular importance given the different nutrient requirements of male and female sexual functions in plants. Here, we evaluated and compared the growth of females and hermaphrodites of Geranium maculatum in response to varying levels of nutrients. Using a greenhouse experiment, we manipulated the overall nutrient, nitrogen, and phosphorus levels in the soil and measured growth, allocation, and leaf quality responses in both females and hermaphrodites. We found that sexes responded similarly in their growth and allocation responses to nutrient availability, albeit evidence that female leaf chlorophyll content may have increased more than that of hermaphrodites across soil nitrogen levels. Our findings demonstrate that hermaphrodites differ from females in terms of their physiological response to varying nutrient levels, however these physiological differences did not translate into meaningful growth or reproduction differences.

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The effects of the depth of fertilization on losses of nitrogen and phosphorus and soil fertility in the red paddy soil of China

PeerJ ◽

10.7717/peerj.11347 ◽

2021 ◽

Vol 9 ◽

pp. e11347

Author(s):

Kun Hou ◽

Ying Huang ◽

Xiangmin Rong ◽

Jianwei Peng ◽

Chang Tian ◽

...

Keyword(s):

Paddy Soil ◽

Ammonia Volatilization ◽

Soil Column ◽

Nitrogen And Phosphorus ◽

Total N ◽

Optimal Depth ◽

Significant Difference ◽

Research Objects ◽

Minimal Environmental Impact ◽

Red Paddy Soil

Nitrogen (N) and phosphorus (P) losses from agroecosystems are dominant nonpoint pollution. To minimize the losses of N and P, the optimal depth of fertilization was explored using a soil column study with the red paddy soil as the research objects. The losses of N and P were measured under five depths of fertilization (0, 5, 7.5, 10, and 12.5 cm) as well as no fertilization. The results showed that ammonia volatilization was significantly decreased with increasing fertilization depth within 0–10 cm, and there was no significant difference among the 10 cm, 12.5 cm, and no-fertilization treatments. Comparing with surface fertilization (0 cm), N and P losses by runoff could be reduced by 30.7–67.1% and 96.9–98.7% respectively by fertilization at 5–12.5 cm. In addition, deep fertilization (5–12.5 cm) did not increase N and P losses by leaching at the depth of 40 cm. Total N and P contents in the tillage layer of soil were increased by 5.1 to 22.8% and by −1.0 to 7.5%, respectively. Fertilization at 10cm depth has the potential to minimal environmental impact in the red paddy soil of south China, at this depth, NH3 volatilization was reduced by 95.1%, and N and P losses by runoff were reduced by 62.0% and 98.4%, respectively, compared with surface fertilization.

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Relationship between nutrient availability and content of nitrogen and phosphorus in tissues of the aquatic macrophyte, Eichornia Crassipes (Mart.) Solms

Hydrobiologia ◽

10.1007/bf00036789 ◽

1971 ◽

Vol 38 (1) ◽

pp. 15-28 ◽

Cited By ~ 36

Author(s):

D. R. Gossett ◽

W. E. Norris

Keyword(s):

Nutrient Availability ◽

Aquatic Macrophyte ◽

Nitrogen And Phosphorus ◽

Eichornia Crassipes

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The elemental and biochemical composition of bryophytes from the maritime Antarctic

Antarctic Science ◽

10.1017/s095410209900022x ◽

1999 ◽

Vol 11 (2) ◽

pp. 157-159 ◽

Cited By ~ 9

Author(s):

Martin C. Davey

Keyword(s):

Short Duration ◽

Nutrient Availability ◽

Biochemical Composition ◽

Seasonal Patterns ◽

Physical Factors ◽

Maritime Antarctic ◽

Nitrogen And Phosphorus ◽

Protein Nitrogen ◽

Moss Species ◽

Antarctic Mosses

The elemental and biochemical composition of eight moss species from the maritime Antarctic were determined fornightly (summer) or monthly (winter) from December 1992 to November 1994. Short-duration summer carbohydrate maxima in Calliergon sarmentosum were seen in both years, but no other seasonal patterns were observed. The absence of seasonality in carbon, nitrogen and phosphorus concentrations or their atomic ratios suggest that the mosses were nutrient-sufficient throughout the year, and that nutrient availability was not important in determining moss productivity. Mosses from hydric habitats had lower carbohydrate and higher protein, nitrogen and phosphorus contents than those from drier habitats, possibly as a consequence of higher productivity and continual flushing with nutrients in wet habitats. The results are consistent with the importance of water and the primacy of physical factors in the ecology of Antarctic mosses.

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