Topics

Intensive fertilizer use increases orchard N cycling and lowers net global warming potential.

08:00 EDT 12th March 2020 | BioPortfolio

Summary of "Intensive fertilizer use increases orchard N cycling and lowers net global warming potential."

Nitrogen (N) fertilizer use has simultaneously increased global food production and N losses, resulting in degradation of water quality and climate pollution. A better understanding of N application rates and crop and environmental response is needed to optimize management of agroecosystems. Here we show an orchard agroecosystem with high N use efficiency promoted substantial gains in carbon (C) storage, thereby lowering net global warming potential (GWP). We conducted a 5-year whole-system analysis comparing reduced (224 kg N ha yr) and intensive (309 kg N ha yr) fertilizer N rates in a California almond orchard. The intensive rate increased net primary productivity (Mg C ha) and significantly increased N productivity (kg N ha) and net N mineralization (mg N kg soil d). Use of N tracers demonstrated short and long-term mechanisms of soil N retention. These low organic matter soils (0.3-0.5%) rapidly immobilized fertilizer nitrate within 36 h of N application and N in tree biomass recycled back into soil organic matter over five years. Both fertilizer rates resulted in high crop and total N recovery efficiencies of 90% and 98% for the reduced rate, and 72% and 80% for the intensive rate. However, there was no difference in the proportion of N losses to N inputs due to a significant gain in soil total N (TN) in the intensive rate. Higher soil TN significantly increased net N mineralization and a larger gain in soil organic carbon (SOC) from the intensive rate offset nitrous oxide (NO) emissions, leading to significantly lower net GWP of -1.64 Mg CO-eq ha yr compared to -1.22 Mg CO-eq ha yr for the reduced rate. Our study demonstrates increased N cycling and climate mitigation from intensive fertilizer N use in this orchard agroecosystem, implying a fundamentally different result than seen in conventional annual cropping systems.

Affiliation

Journal Details

This article was published in the following journal.

Name: The Science of the total environment
ISSN: 1879-1026
Pages: 137889

Links

DeepDyve research library

PubMed Articles [7098 Associated PubMed Articles listed on BioPortfolio]

Global warming: the implications for urologic disease.

Global warming is receiving more attention in both the lay and scientific press. However, many individuals still view global warming as an abstract, distant concern that has little, if any, impact on ...

Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland.

Subsoil contains more than half of soil organic carbon (SOC) globally and is conventionally assumed to be relatively unresponsive to warming compared to the topsoil. Here we show substantial changes i...

The human imperative of stabilizing global climate change at 1.5°C.

Increased concentrations of atmospheric greenhouse gases have led to a global mean surface temperature 1.0°C higher than during the pre-industrial period. We expand on the recent IPCC Special Report ...

Combined effects of nitrogen fertilizer and biochar on greenhouse gas emissions and net ecosystem economic budget from a coastal saline rice field in southeastern China.

Biochar amendment has complex impacts on greenhouse gas emissions, crop production and economic benefit. However, few studies have comprehensively investigated the effects of biochar amendment in coas...

Can white clover facilitate apple orchard residue composting?

Aiming to assess the efficiency of white clove (WC) as an alternative nitrogen source for composting and to facilitate the utilization of orchard waste, WC as compared with chicken manure (CM) was aer...

Clinical Trials [4211 Associated Clinical Trials listed on BioPortfolio]

In-Bed Cycling in ICU Patients Post Cardiac Surgery

The purpose of this study is to determine if in-bed cycling is safe and feasible in critically-ill patients after open heart surgery. The investigators hypothesize that in-bed cycling can ...

Comparison of a New Patient Warming System Using Polymer Conductive Warming With Forced Air Warming During Surgery

Two patient warming systems will be compared with 40 patients each in a convective warming group (BairHugger, Arizant) and in a conductive warming group (HotDog, Augustine Biomedical). ...

Early Rehabilitation Using Functional Electrical Stimulation Assisted Supine Cycling in the Intensive Care Unit

Critically ill patients in the intensive care unit are known to lose muscle mass and function at a rapid rate. Currently, there is a global recognition and shift in the ICU culture to redu...

Comparison of a New Patient Warming System Using a Polymer Conductive Warming Under-body and Upper-body Blanket With Forced Air Warming

Intraoperative active warming is usually performed by skin warming. There are several forced-air systems on the market; forced air warming is generally described as the most effective yet ...

Intraoperative Warming During Major Surgical Procedures Using the Esophageal Temperature Management System

The aim of this study is to assess the effectiveness of EnsoETM as a supplemental warming device compared to the standard of care warming practice in patients having major surgery.

Medical and Biotech [MESH] Definitions

Increase in the temperature of the atmosphere near the Earth's surface and in the troposphere, which can contribute to changes in global climate patterns.

A set of opposing, nonequilibrium reactions catalyzed by different enzymes which act simultaneously, with at least one of the reactions driven by ATP hydrolysis. The results of the cycle are that ATP energy is depleted, heat is produced and no net substrate-to-product conversion is achieved. Examples of substrate cycling are cycling of gluconeogenesis and glycolysis pathways and cycling of the triglycerides and fatty acid pathways. Rates of substrate cycling may be increased many-fold in association with hypermetabolic states resulting from severe burns, cold exposure, hyperthyroidism, or acute exercise.

The effect of GLOBAL WARMING and the resulting increase in world temperatures. The predicted health effects of such long-term climatic change include increased incidence of respiratory, water-borne, and vector-borne diseases.

Hospital units providing continuous surveillance and care to acutely ill infants and children. Neonates are excluded since INTENSIVE CARE UNITS, NEONATAL is available.

A progressive form of dementia characterized by the global loss of language abilities and initial preservation of other cognitive functions. Fluent and nonfluent subtypes have been described. Eventually a pattern of global cognitive dysfunction, similar to ALZHEIMER DISEASE, emerges. Pathologically, there are no Alzheimer or PICK DISEASE like changes, however, spongiform changes of cortical layers II and III are present in the TEMPORAL LOBE and FRONTAL LOBE. (From Brain 1998 Jan;121(Pt 1):115-26)

Quick Search


DeepDyve research library

Relevant Topic

Food
Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism ...


Searches Linking to this Article