Aluminum distribution heterogeneity and relationship with nitrogen, phosphorus and humic acid content in the eutrophic lake sediment

2019 ◽  
Vol 253 ◽  
pp. 516-524 ◽  
Author(s):  
Qingwei Lin ◽  
Xue Peng ◽  
Biyun Liu ◽  
Fenli Min ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Humic Acid ◽  
Lake Sediment ◽  
Acid Content ◽  
Eutrophic Lake ◽  
Aluminum Distribution ◽  
Nitrogen Phosphorus

scholarly journals HUMIC ACID ON GERMINATION AND VIGOR OF CORN SEEDS1

2017 ◽  
Vol 30 (1) ◽  
pp. 149-154 ◽  
Author(s):  
LENNIS AFRAIRE RODRIGUES ◽  
◽  
CHARLINE ZARATIN ALVES ◽  
CARLOS HENRIQUE QUEIROZ REGO ◽  
TIAGO ROQUE BENETOLI DA SILVA ◽  
...  
Keyword(s):  
Humic Acid ◽  
Humic Substances ◽  
Acid Content ◽  
Dry Mass ◽  
Positive Influence ◽  
Seed Vigor ◽  
Seedling Vigor ◽  
Stand Establishment ◽  
Effect Of Treatment ◽  
Agriculture Products

ABSTRACT The development of technologies to increase stand establishment efficiency and seed vigor, as well as to maximize profits, is of fundamental importance for the sustainability of agriculture. Products based on humic substances, such as humic acids, have been recently used in Brazilian agriculture to produce seedlings with high vigor, which positively influences the establishment of the initial stand. Thus, this study aimed to evaluate the effect of treatment of corn seeds with a commercial humic acid-based product, Humykos® (18% of humic acid content), on germination and seedling vigor. The treatments consisted of six doses (0, 100, 200, 300, 400, and 500 mL 100 kg-1 seed) of Humykos®, and the treated seeds were analyzed for germination and vigor (first count, emergence, emergence speed index, length, and dry mass of shoots and roots). Our results show that humic acid promotes greater seedling growth and increased shoot dry mass in corn; in addition, it has a positive influence on the emergence speed index up to a dose 158 mL 100 kg -1 seeds.

Microbial interactions in heterotrophic nitrification

1986 ◽  
Vol 32 (3) ◽  
pp. 243-247 ◽  
Author(s):  
Jinnque Rho
Keyword(s):  
Carbon Source ◽  
Lake Sediment ◽  
Water Samples ◽  
Eutrophic Lake ◽  
Nitrogen Transformation ◽  
Heterotrophic Nitrification ◽  
Microbial Interactions ◽  
Ammonium Ion ◽  
Inorganic Salts ◽  
Corynebacterium Sp

An Arthrobacter sp. capable of extensive nitrification was isolated from a eutrophic lake sediment employing inorganic salts medium with acetamide as the carbon source. This heterotrophic nitrifier was found to be closely associated with a Corynebacterium sp. both in growth and in nitrification. When the Arthrobacter sp. was jointly cultured with the Corynebacterium sp. in medium containing ammonium ion, acetate, and inorganic salts, the concentrations of nitrification products (nitrite and nitrate) increased approximately 10-fold. This stimulatory interaction was also determined in filter-sterilized sediment water samples amended with ammonium ion and acetate. Although both organisms failed to grow singly in media containing 1 mg/mL of nitrite N and of acetaldoxime N, they grew well in both media when cultured jointly. Nitrification, however, occurred only in the acetaldoxime medium. This is the first reported instance of mutualistic relationships in heterotrophic nitrification arid appears to be significant to our understanding of nitrogen transformation in lacustrine environments.

scholarly journals Nitrification and dentrification in a eutrophic lake sediment bioturbated by oligochaetes

2001 ◽  
Vol 23 ◽  
pp. 177-186 ◽  
Author(s):  
JM Svensson ◽  
A Enrich-Prast ◽  
L Leonardson
Keyword(s):  
Lake Sediment ◽  
Eutrophic Lake
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