Results 61 to 70 of about 2,695 (217)
Comparative measurements of carbon dioxide fluxes from two nearby towers in a central Amazonian rainforest: the Manaus LBA site [PDF]
, 2002 Forests around Manaus have staged the oldest and the longest forest-atmosphere CO2 exchange studies made anywhere in the Amazon. Since July 1999 the exchange of CO2, water, and energy, as well as weather variables, have been measured almost continuously ...
Araújo, A.C. +11 more
core +2 more sources
Nitrogen fertilizer placement and its influence on snap bean production in North Florida
Agrosystems, Geosciences &Environment, Volume 8, Issue 3, September 2025.Abstract In sandy soils or areas with abundant rainfall, nutrients tend to leach from where plant roots grow. Nitrogen (N) is a mobile element that is consistently at risk of being lost to the environment. In the spring of 2023, a controlled‐release fertilizer (CRF) study with two locations was undertaken at the North Florida Research and Education ...
Rajkaranbir Singh +6 more
wiley +1 more source
Revista Brasileira de Ciência do Solo, 2010 Em solos de restinga de constituição areno-quartzosa aumenta a influência da fração orgânica e da atividade biológica em funções-chave dos solos, como a capacidade de reciclar e armazenar nutrientes.
João Bosco Vasconcellos Gomes +6 more
doaj +1 more source
Soils: A contemporary perspective [PDF]
, 2007 Soils are viewed in the context of ecosystem services, soil processes and properties, and key attributes and constraints. The framework used is based on the premise that the natural capital of soils that underlies ecosystem services is primarily ...
Alex Awiti +4 more
core +3 more sources
Vadose Zone Journal, Volume 24, Issue 5, September/October 2025.Abstract Predicting water retention is difficult for highly aggregated volcanic soils (Andisols) with heterogeneous pore size distribution. This paper aimed to examine how andic materials influence soil water retention based on soil composition. We compiled the data of water retention in the soils from literature with physicochemical properties and ...
Kazumichi Fujii +4 more
wiley +1 more source
Foliar nutrient levels of native tree species from Central Amazonia. 2. Campina
, 1985 Adult leaves of 14 woody species were sampled in the campina at km 62 of the road Manaus - Caracaraí. The lamina were classified as to their size and analysed for N, P, K, Ca, Mg and Na. Comparing the foliar levels of the bioelements to relevant data for
Klinge, H.
core
Long-term and seasonal variations in CO2: linkages to catchment alkalinity generation [PDF]
, 2001 International audienceAs atmospheric emissions of S have declined in the Northern Hemisphere, there has been an expectation of increased pH and alkalinity in streams believed to have been acidified by excess S and N.
Cosby, B.J. +4 more
core +2 more sources
Soil CO$_2$ efflux in Central Amazonia: Environmental and methodological effects [PDF]
, 2012 Soil respiration plays a significant role in the carbon cycle of Amazonian rainforests. Measurements of soil respiration have only been carried out in few places in the Amazon.
Kesselmeier, J. +4 more
core +3 more sources
Differential water and imidacloprid transport under unsaturated Florida citrus field conditions
Vadose Zone Journal, Volume 24, Issue 5, September/October 2025.Abstract Citrus production in Florida declined in the past 20 years by >72% due to citrus greening disease which is vectored by Asian citrus psyllid (ACP). Extensive use of pesticides such as imidacloprid (IDP) to manage ACP raises concerns of environmental pollution to shallow groundwater in citrus orchards dominated by sandy soils.
Qudus O. Uthman +3 more
wiley +1 more source
Ciência e Agrotecnologia, 2012 The scarcity of comprehensive characterizations of soils associated to gentle summit depressions of the Northeastern Brazilian Coastal Plains justifies this work, which had as objective to provide basic information for the more diverse agricultural and ...
Elen Alvarenga Silva +5 more
doaj +1 more source