scholarly journals Winter weather and lake‐watershed physical configuration drive phosphorus, iron, and manganese dynamics in water and sediment of ice‐covered lakes

2017 ◽  
Vol 62 (4) ◽  
pp. 1620-1635 ◽  
Author(s):  
DongJoo Joung ◽  
Meagan Leduc ◽  
Benjamin Ramcharitar ◽  
Yaoyang Xu ◽  
Peter D. F. Isles ◽  
...  
Keyword(s):  
Winter Weather ◽  
Water And Sediment ◽  
Phosphorus Iron ◽  
Iron And Manganese

Effects of Moisture and Nitrogen on Growth, Yield and Mineral Content of Rice

1969 ◽  
Vol 5 (2) ◽  
pp. 125-132 ◽  
Author(s):  
H. K. Pande ◽  
Panjab Singh
Keyword(s):  
Crop Yield ◽  
Mineral Content ◽  
Manganese Content ◽  
Growth Yield ◽  
Significant Difference ◽  
Moisture Supply ◽  
Phosphorus Iron ◽  
Limited Moisture ◽  
Nitrogen Phosphorus ◽  
Iron And Manganese

SummaryLimited moisture supply caused reduction in leaf area, number of effective tillers, ratio of sound to unsound grains and the nitrogen, phosphorus, iron and manganese content of rice. Crop yield was adversely affected in the absence of standing water. Two levels of nitrogen (40 and 60 kg.N/ha.) caused no significant difference in yield in 1965, but in 1966, when 30 and 60 kg. N/ha. were used, the latter gave better yields.

Effect of heating vermiculites on extractability of phosphorus and some essential plant micronutrients

Clay Minerals ◽  
2012 ◽  
Vol 47 (3) ◽  
pp. 365-371
Author(s):  
E. M. M. Marwa ◽  
A. A. Meharg ◽  
C. M. Rice
Keyword(s):  
Acetic Acid ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flow Injection ◽  
Absorption Spectrometry ◽  
Diethylene Triamine ◽  
Phosphorus Iron ◽  
Diethylene Triamine Pentaacetic Acid ◽  
Agricultural Use ◽  
Iron And Manganese

AbstractThe study assessed the effect of heating vermiculites on extractability of phosphorus, iron, zinc and manganese with respect to their potential agricultural use. Of these elements, phosphorus was from apatite and monazite that occur as accessory minerals in vermiculites. Vermiculites were heated at 15–800°C and digested by acetic acid for extracting phosphorus and diethylene triamine pentaacetic acid (DTPA) for extracting zinc, iron and manganese. Phosphorus in the extract was analysed by a flow injection method while zinc, iron and manganese were measured by atomic absorption spectrometry. The results showed that heating vermiculites to 400°C enhanced extractability of phosphorus from apatite and monazite to a level of 335 mg kg–1. Further heating to 800°C reduced extractable phosphorus to less than 75 mg kg–1. Maximum extractable zinc, iron and manganese found were 2.7, 19.1 and 22.9 mg kg–1, respectively, values that are beneficial and tolerable by most plants. Thus, it was concluded that heating vermiculites to ⩽ 400°C optimizes extractability of phosphorus from incorporated apatite and monazite and some essential plant micronutrients in vermiculites.

The mobility of phosphorus, iron, and manganese through the sediment–water continuum of a shallow eutrophic freshwater lake under stratified and mixed water-column conditions

2015 ◽  
Vol 127 (1) ◽  
pp. 15-34 ◽  
Author(s):  
Courtney D. Giles ◽  
Peter D. F. Isles ◽  
Tom Manley ◽  
Yaoyang Xu ◽  
Gregory K. Druschel ◽  
...  
Keyword(s):  
Water Column ◽  
Freshwater Lake ◽  
Phosphorus Iron ◽  
Mixed Water ◽  
Iron And Manganese

scholarly journals Genotypic Variation in Nickel Accumulation and Translocation and Its Relationships with Silicon, Phosphorus, Iron, and Manganese among 72 Major Rice Cultivars from Jiangsu Province, China

2019 ◽  
Vol 16 (18) ◽  
pp. 3281
Author(s):  
Ya Wang ◽  
Chengqiao Shi ◽  
Kang Lv ◽  
Youqing Li ◽  
Jinjin Cheng ◽  
...  
Keyword(s):  
Genotypic Variation ◽  
Jiangsu Province ◽  
Rice Cultivars ◽  
Phosphorus Iron ◽  
Nickel Accumulation ◽  
Translocation Factors ◽  
Hydroponic Conditions ◽  
Ni Accumulation ◽  
Uptake And Transport ◽  
Iron And Manganese

Nickel (Ni) is a ubiquitous environmental toxicant and carcinogen, and rice is a major dietary source of Ni for the Chinese population. Recently, strategies to decrease Ni accumulation in rice have received considerable attention. This study investigated the variation in Ni accumulation and translocation, and also multi-element (silicon (Si), phosphorus (P), iron (Fe), and manganese (Mn)) uptake and transport among 72 rice cultivars from Jiangsu Province, China, that were grown under hydroponic conditions. Our results showed a 2.2-, 4.2-, and 5.3-fold variation in shoot Ni concentrations, root Ni concentrations, and translocation factors (TFs) among cultivars, respectively. This suggests that Ni accumulation and translocation are significantly influenced by the genotypes of the different rice cultivars. Redundancy analysis of the 72 cultivars revealed that the uptake and transport of Ni were more similar to those of Si and Fe than to those of P and Mn. The Ni TFs of high-Ni cultivars were significantly greater than those of low-Ni cultivars (p < 0.001). However, there were no significant differences in root Ni concentrations of low-Ni and high-Ni cultivars, suggesting that high-Ni cultivars could translocate Ni to shoots more effectively than low-Ni cultivars. In addition, the cultivars HD8 and YD8 exhibited significantly lower levels of Ni accumulation than their parents (p < 0.05). Our results suggest that breeding can be an effective strategy for mitigating excessive Ni accumulation in rice grown in Ni-contaminated environments.

Colloidal systems in soils

1994 ◽  
Vol 52 ◽  
pp. 64-65
Author(s):  
J. Thieme ◽  
J. Niemeyer ◽  
P. Guttman
Keyword(s):  
Clay Minerals ◽  
Polymeric Materials ◽  
Spatial Arrangement ◽  
High Specific Surface Area ◽  
Turnover Rates ◽  
Colloidal Systems ◽  
Chemical Conditions ◽  
Aggregation Phenomena ◽  
Iron And Manganese ◽  
Soil Colloids

In soil science the fraction of colloids in soils is understood as particles with diameters smaller than 2μm. Clay minerals, aquoxides of iron and manganese, humic substances, and other polymeric materials are found in this fraction. The spatial arrangement (microstructure) is controlled by the substantial structure of the colloids, by the chemical composition of the soil solution, and by thesoil biota. This microstructure determines among other things the diffusive mass flow within the soils and as a result the availability of substances for chemical and microbiological reactions. The turnover of nutrients, the adsorption of toxicants and the weathering of soil clay minerals are examples of these surface mediated reactions. Due to their high specific surface area, the soil colloids are the most reactive species in this respect. Under the chemical conditions in soils, these minerals are associated in larger aggregates. The accessibility of reactive sites for these reactions on the surface of the colloids is reduced by this aggregation. To determine the turnover rates of chemicals within these aggregates it is highly desirable to visualize directly these aggregation phenomena.

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