Globally relevant lessons from a long-term trial series testing universal hypothesis of the impacts of increasing biomass removal on site productivity and nutrient pools

2021 ◽  
Vol 494 ◽  
pp. 119325
Author(s):  
L.G. Garrett ◽  
S.J. Smaill ◽  
S.L. Addison ◽  
P.W. Clinton
Keyword(s):  
Site Productivity ◽  
Nutrient Pools ◽  
Biomass Removal ◽  
Term Trial ◽  
Trial Series

scholarly journals Studying the impacts of harvest intensity on site productivity of Ontario's black spruce ecosystems

1999 ◽  
Vol 75 (3) ◽  
pp. 439-445 ◽  
Author(s):  
Dave M. Morris ◽  
Dan R. Duckert
Keyword(s):  
Black Spruce ◽  
Complete Removal ◽  
Site Productivity ◽  
Northwestern Ontario ◽  
Biomass Removal ◽  
Core Study ◽  
Group A ◽  
Tree Length ◽  
Study Sites

As a result of a Class Environmental Assessment, the Ontario Ministry of Natural Resources (OMNR) was mandated to design and implement a research project pertaining to the effects of full-tree harvesting on long-term site productivity. This project, initiated in 1991, was designed to focus on ecosystem processes and the changes occurring to these processes after harvesting (e.g., quantifying the disruption and recovery) for the black spruce working group. A series of replicated, experimental harvest treatments with varying degrees of biomass removal were conducted on nine core study sites, representing different black spruce ecosites located in northwestern Ontario, Canada. The harvest treatments included: uncut — controls, tree length — delimbed at the stump, full tree — delimbed at the roadside, full-tree chipping — chipped debris was returned to the harvest plot, and whole tree — complete removal of vegetation and forest floor. Each site consisted of 16 plots, three replicates of the four harvest treatments (30 m × 30 m plots) and four replicates of the control plots (50 m × 50 m plots). Work on this project is anticipated to continue for a minimum of fifteen years to detail the early and most dynamic stages of post-harvest recovery. Key words: black spruce, site productivity, nutrient cycling, harvesting impacts

scholarly journals Long-Term Ecosystem Nutrient Pool Status for Aspen Forest Harvest Simulations on Glacial Till and Sandy Outwash Soils

Forests ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1556
Author(s):  
Robert P. Richard ◽  
Evan S. Kane ◽  
Dustin R. Bronson ◽  
Randall K. Kolka
Keyword(s):  
Nutrient Retention ◽  
Nutrient Budget ◽  
Glacial Till ◽  
Soil Survey ◽  
Low Fertility ◽  
Nutrient Pools ◽  
Nutrient Pool ◽  
Rotation Length ◽  
National Cooperative

Sandy outwash and glacial till soils compose large amounts of public forestland due to historically poor agricultural yields. The outwash soils have low fertility, poor nutrient retention and are restricted from whole-tree harvesting (WTH) in some states, whereas the glacial till has medium nutrient retention and fertility, and is unrestricted from WTH. To assess the long-term sustainability of harvesting, a nutrient budget was constructed from field measurements, the National Cooperative Soil Survey (NCSS) database, and literature values for stem-only harvesting (SOH) and WTH at a 45-year rotation length and 11 rotations were simulated. The budgets showed that SOH and WTH recovery years, or the time necessary for the inputs to match outputs through leaching and one harvest, exceeded common rotation lengths for both soil types under all weathering scenarios, and the average WTH reduced the total available rotations by one harvest. The large variation in soil nutrient pools and harvest removals complicated the ability to identify the difference between SOH and WTH early in the model, but differences became apparent with sequential harvests. The recovery years were 2–20 times the 45-year rotation length under all weathering rates. Taken together, models in this study bridge the gap between short- and long-term studies and bring into question the sustainability of WTH and SOH practices on nutrient-poor soils.

scholarly journals Researches Regarding the Crop Rotation and Irrigation Influences on Protein Content of the Wheat Grains in the Crişurilor Plain Conditions

1970 ◽  
Vol 66 (2) ◽  
Author(s):  
Ileana ARDELEAN
Keyword(s):  
Protein Content ◽  
Crop Rotation ◽  
Wheat Grains ◽  
Soybean Crop ◽  
Term Trial

The paper based on the researches carried out during 2006-2008 in the long term trial placed in 1990 on the preluvosoil from Oradea. Three kind of crop rotation (wheat – monocrop; wheat – maize; wheat – maize – soybean) were studied in unirrigated and irrigated conditions. The smallest content of the protein from wheat grains were registered in the wheat monocrop both nonirrigated and irrigated variant. In the wheat-maize and wheat-maize-soybean crop rotation the values registered were significant statistically bigger than in wheat monocrop. Irrigation determined the decrease of the protein content.

scholarly journals The Influence of Some Phytotechnical Elements on Attaque of Diabrotica Virgifera Virgifera Le Conte (The Western Root Worm) in Maize from Crisurilor Plain

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Cornelia CIOBANU ◽  
Cornel DOMUŢA ◽  
Gheorghe CIOBANU ◽  
Maria ŞANDOR ◽  
Alina Dora SAMUEL ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Diabrotica Virgifera Virgifera ◽  
Crop Rotations ◽  
Wheat Crop ◽  
Diabrotica Virgifera ◽  
Term Trial ◽  
Lower Plant

The paper based on the researches carried out during 2005 – 2008 in the long term trial placed in 1990 on the preluvosoil from Oradea. The monoculture of maize, maize – wheat and maize – soybean – wheat crop rotations were studied in unirrigated and irrigated conditions. The crop rotatin of six years (oat + clover – clover – maize – wheat – maize - sunflower) was studied in unirrigated conditions. The researches emphasized that the monoculture is the most responsible for the pest multiplication. In maize monoculture the larvae number on the roots was ranged between 4.91-8.23 and root attack degree in IOWA scale (with marks from 1 to 6 in which maximum attack is 6), had values between 3.84 and 5.62 and the frequent of attacked plants with the symptom “goose neck” ranged between 16,4% and 31.2% and larval aggressiveness being higher in the case of favorable soil moisture in irrigated condition. The maize rotation with other plants interrupts the biologic pest cycle. The results obtained emphasize that later maize sowing alongside by the utilizing of lower plant thickness level contribute to prevention of pest multiplication, while earlier sowing at high thickness favor the larvae developing.

scholarly journals THE BUCKWHEAT ROLE IN CROP ROTATION AND WEED CONTROL IN THIS SOWINGS IN LONG TERM TRIAL

2015 ◽  
Vol 1 ◽  
pp. 141
Author(s):  
Andris Lejiņš ◽  
Biruta Lejiņa
Keyword(s):  
Weed Control ◽  
Crop Rotation ◽  
Crop Rotations ◽  
Winter Rye ◽  
Term Trial ◽  
Experimental Plots ◽  
Yield Decrease ◽  
Research Institute

Buckwheat research has been carried out within the long-term crop rotation stationary that was established in 1969 as a part of the Research institute of Agriculture. Buckwheat proportion within the partcular crop rotations went up to 22%. The highest buckwheat yields were obtained from the buckwheat variants that where cultivated after winter rye, and within the buckwheat monoculture experimental plots. A considerable yield decrease was observed when cultivating buckwheat after potatoes. Weeds in the buckwheat sowing were effectively brought under control by the herbicide Butisane 400 (1.5 l ha-1), applied immediately after sowing and Betanal AM 2.5 l ha-1 after seedling in 2-3 leaves stage.

Cattle manure loadings and legacy effects on Cu and Zn availability under rainfed and irrigated conditions

2021 ◽  
Author(s):  
Srimathie Priyanthika Indraratne ◽  
Matthew Spengler ◽  
Xiying Hao
Keyword(s):  
Cattle Manure ◽  
Legacy Effects ◽  
Nutrient Pools ◽  
Application Rates ◽  
Wet Weight ◽  
Using Data ◽  
Time Required ◽  
Zn Availability ◽  
Cu And Zn

Long term cattle manure applications build up nutrient pools and can lead to trace element enrichments in soils. The objectives of this study were to evaluate Cu and Zn loadings in the soil during continuous annual cattle manure applications and determine the time required for soil to return to its pre-manure available Cu and Zn levels after manure is discontinued. The manure application rates were 0, 30, 60, and 90 Mg ha-1 for rainfed and 0, 60, 120, and 180 Mg ha-1 (wet weight) for irrigated plots. While manure was applied for 45 years in some plots, applications were terminated in one subset of treatments after 14 years and in another subset after 30 years to study legacy effects after 31 and 15 years, respectively. Soil samples were collected in the fall of 2003, 2008, 2013, and 2018 and analyzed for available Cu and Zn. Crops were grown in all years continuously with Cu and Zn concentrations measured in both silage and grains harvested. The regression model developed using data collected suggests long legacy effects with recovery time to pre-manure levels ranging from 10-20 years for Cu and 23-41 years for Zn at irrigated and 10-24 for Cu and 21-32 years for Zn under rainfed, respectively. Long term applications of cattle manure could lead to accumulation of Cu and Zn, creating long-lasting legacy effects in soils with the increased environmental risk of leaching to groundwater

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