The long-term effects of monoculture maize cultivation on plant diversity

2021 ◽  
Vol 50 (4) ◽  
pp. 397-408
Author(s):  
Anneliese Fuchs ◽  
Vanessa Berger ◽  
Klaus Steinbauer ◽  
Tobias Köstl ◽  
Daniel Wuttej ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Long Term Effects ◽  
Maize Cultivation

Long-term effects of plant diversity and composition on plant stoichiometry

Oikos ◽  
2015 ◽  
Vol 125 (5) ◽  
pp. 613-621 ◽  
Author(s):  
Jordan Guiz ◽  
Helmut Hillebrand ◽  
Elizabeth T. Borer ◽  
Maike Abbas ◽  
Anne Ebeling ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Long Term Effects

Long-term effects of plant diversity and composition on soil nematode communities in model grasslands

Ecology ◽  
2009 ◽  
Vol 90 (1) ◽  
pp. 90-99 ◽  
Author(s):  
Maria Viketoft ◽  
Janne Bengtsson ◽  
Björn Sohlenius ◽  
Matty P. Berg ◽  
Owen Petchey ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Soil Nematode ◽  
Long Term Effects ◽  
Nematode Communities ◽  
Soil Nematode Communities

scholarly journals Long-Term Effects of the Use of Organic Amendments and Crop Rotation on Soil Properties in Southeast Spain

Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2363
Author(s):  
Antonio Sánchez-Navarro ◽  
Juan Sánchez-Martínez ◽  
Eva María Barba-Corbalán ◽  
Magdalena Valverde-Pérez ◽  
Aldara Girona-Ruíz ◽  
...  
Keyword(s):  
Crop Rotation ◽  
Carbon Sink ◽  
Organic Amendments ◽  
Chemical Properties ◽  
Soil Management ◽  
Degradation Process ◽  
Long Term Effects ◽  
Forage Maize ◽  
Maize Cultivation

The evolution of soil chemical properties over 20 years was monitored to assess the effects of the change in soil management from a rainfed to an irrigated model and the use of organic amendments and crop rotation. Intensive agriculture has been the activity that has caused most degradation and contamination of this soil. Long-term monitoring of the soil profile made it possible to assess its response to the application of sustainable agricultural techniques intended to offset these effects. Three profiles of the same soil were studied—P1 (1998), P2 (2003), P3 (2017)—to show the evolution in time and space. An incipient degradation process was detected in the first five years, verified by increases in salinity (2.3 dS m−1), exchangeable Na (0.5 g kg−1), and TN (1.3 g kg−1) in P2 in comparison with P1 (1.0, 0.2, and 1.1, respectively). There was also leaching towards the deep horizons for TN (0.4, 0.9, and 0.7 g kg−1 for P1, P2, and P3, respectively), and for assimilable elements such as P (1.1, 6.4, and 3.8), Fe (2.0, 2.1, and 5.6), Mn (0.3, 6.5, and 1.9), Zn (0.3, 0.5, and 0.9), and Cu (0.5, 0.6, and 1.3) (all mg kg−1, for P1, P2, and P3, respectively). Between 2004 and 2017, organic amendments (sheep manure) were reduced by 50%, crop rotation was intensified, and green fertilization and forage maize cultivation were included. As a result, P3 showed an improvement in comparison with P2, with decreases in EC (1.4 dS m−1), exchangeable Na (0.2 g kg−1), and TN (0.8 g kg−1). The change in soil management enhanced some soil functions (carbon sink and chemical fertility) and attenuated soil degradation.

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

Long-term effects of a course on dental care for handicapped persons

1989 ◽  
Vol 53 (12) ◽  
pp. 722-724 ◽  
Author(s):  
R Bedi ◽  
D O'Donnell
Keyword(s):  
Dental Care ◽  
Long Term Effects

903: What are the Long Term Effects on Erectile Function of Taking Sildenafil on a Daily Basis?

2004 ◽  
Vol 171 (4S) ◽  
pp. 239-239 ◽  
Author(s):  
Frank Sommer ◽  
Udo H. Engelmann ◽  
Keyword(s):  
Erectile Function ◽  
Daily Basis ◽  
Long Term Effects
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