scholarly journals Dry aggregate stability of soils influenced by crop rotation, soil amendment, and tillage in the Columbia Plateau

2019 ◽  
Vol 40 ◽  
pp. 65-73 ◽  
Author(s):  
Huawei Pi ◽  
David R. Huggins ◽  
Brenton Sharratt
Keyword(s):  
Crop Rotation ◽  
Soil Amendment ◽  
Aggregate Stability ◽  
Columbia Plateau

Residual Dry Matter, Weeds and Soil Aggregates after Winter Cover Crop

2019 ◽  
pp. 1-11
Author(s):  
Edleusa Pereira Seidel ◽  
João Henrique Silva Caetano ◽  
Arthur Schafer Karpinski ◽  
Willian Dos Reis
Keyword(s):  
Crop Rotation ◽  
Cover Crops ◽  
Cover Crop ◽  
Soil Aggregates ◽  
Block Design ◽  
Aggregate Stability ◽  
Dry Mass ◽  
No Tillage ◽  
Common Vetch ◽  
Winter Cover

Soil quality maintenance in a no-tillage system (NTS) depends on cover crops. They are essential for crop rotation, affect several soil attributes, and contribute to phytosanitary control. However, cover crop efficacy is influenced by their root function and the presence of plant straw on soil surfaces. The objective of this study was to compare various winter cover crops in terms of their effects on dry mass yield, straw persistence after 40 d, weed incidence, and soil aggregate stability. The soil tested was an Oxisol Ustox Hapludox in Western Paraná State, southern Brazil. A randomized block design was used with four replicates and six treatments (fallow, black oat, fodder turnip, field pea, common vetch, and fodder turnip + black oat). Cover crops were managed 88 d after sowing. Dry mass (DM) and residual dry mass (RDM) were measured at 20 d and 40 d after harvest. Aggregate stability and weed type and density were evaluated after 40 d of management (DAM). The results showed that black oat obtained the lowest decomposition; therefore, a potential species to be used in the system of crop rotation in the no-tillage. The consorted of fodder turnip and black oat provided relatively higher dry mass yields and improved soil aggregation. Cover crops reduced the incidence of weeds, being important for no-till sustainability.

scholarly journals Crop Rotation and Soil Amendment Alters Sorghum Grain Quality

Crop Science ◽  
2007 ◽  
Vol 47 (4) ◽  
pp. 1764-1764 ◽  
Author(s):  
Nanga Mady Kaye ◽  
Stephen C. Mason ◽  
David S. Jackson ◽  
Tom D. Galusha
Keyword(s):  
Crop Rotation ◽  
Soil Amendment ◽  
Grain Quality ◽  
Sorghum Grain

scholarly journals Crop Rotation and Soil Amendment Alters Sorghum Grain Quality

Crop Science ◽  
2007 ◽  
Vol 47 (2) ◽  
pp. 722-727 ◽  
Author(s):  
Nanga Mady Kaye ◽  
Stephen C. Mason ◽  
David S. Jackson ◽  
Tom D. Galusha
Keyword(s):  
Crop Rotation ◽  
Soil Amendment ◽  
Grain Quality ◽  
Sorghum Grain

Effects of crop rotation on properties of a Vietnam clay soil under rice-based cropping systems in small-scale farmers' fields

Soil Research ◽  
2017 ◽  
Vol 55 (2) ◽  
pp. 162 ◽  
Author(s):  
Tran Ba Linh ◽  
Vo Thi Guong ◽  
Vo Thi Thu Tran ◽  
Le Van Khoa ◽  
Daniel Olk ◽  
...  
Keyword(s):  
Crop Rotation ◽  
Cropping Systems ◽  
Mekong Delta ◽  
Aggregate Stability ◽  
Stability Index ◽  
Small Scale ◽  
Rice Soils ◽  
Upland Crop ◽  
Small Scale Farmers ◽  
Soc Stocks

In tropical deltas, intensive monoculture with three rice crops per year (RRR) has been the standard for decades. However, in recent years some farmers have started rice-based rotations with one or more upland crops per year. The trends for increased grain yields with this new system raises the question as to whether the introduction of upland crops affects properties of alluvial clay paddy soil. This was evaluated in the present study, which was performed at 40 paddy fields in the Vietnamese Mekong Delta under four different cropping systems (10 farms per system) on paddy rice soils: RRR; crop rotation with two rice crops and one upland crop per year (RUR); crop rotation with one rice and two upland crops per year (RUU); and upland crop (UUU). Soil samples were collected at depths of 0–10, 10–20 and 20–30cm. Most soil properties differed significantly between the RRR and the RUR, RUU or UUU. The RUR, RUU and UUU systems alleviated soil compaction, resulting in reduced penetration resistance and bulk density and increased total and macroporosity at 20–30cm depth. In addition, aggregate stability index and plant-available water capacity were higher for RUR, RUU and UUU compared with RRR at the 20–30cm depth. Average soil organic carbon (SOC) stocks ranged from 59.3tha–1 in UUU to 72.3tha–1 in RUR, with SOC stocks in RRR and RUU being intermediate (66.4 and 68.3tha–1) and not significantly different to that of the RUR system. Carbon hydrolysable by HCl (Chydrolysable) was 74–84% greater in the RUR, RUU and UUU than in RRR systems. In conclusion, rice–upland crop systems may alleviate soil degradation resulting from continuous rice monoculture.

scholarly journals Improvement of Soil Physical Properties of Cambisol Using Soil Amendment

2018 ◽  
Vol 7 (2) ◽  
pp. 93-102
Author(s):  
Darusman Darusman ◽  
Devianti Devianti ◽  
Edi Husen
Keyword(s):  
Physical Properties ◽  
Soil Water ◽  
Soil Amendment ◽  
Soil Depth ◽  
Block Design ◽  
Maximum Yield ◽  
Aggregate Stability ◽  
Stability Index ◽  
Soil Physical Properties ◽  
Cow Manure

Managing dryland requires intergrated knowledges on soil, water and plants relationship in order to achieve maximum yield. Using local and unused resource is important not only in aspect of reducing pollution but low price and also affordable for farmers. Thus, using amendment from in situ resources is suggested by many experts. This amendment used is assumed it could contribute improvement physical properties of soil and result better yields. This study aimed to studi more deeply on how much of soil amendment might improve physical properties of Cambisol under dryland environment and furthermore find out the crop response to soil amendments. The research was conducted during July to Oct. 2016 at Gampong Paud, Muara Tiga District, Pidie District, Aceh Province  with the altitude ± 30 m asl and slope 0-3 %.  A Randomized Completely Block Design (RCBD) with two factors replicated three times was used. First factor was soil amendment consisting of 4 levels ; no amendment (control), cow manure amount 10 ton ha -1, straw compost 10 ton ha-1, and  cow manure 10 ton ha -1 + compost 10 ton ha-1. The second factor was 5 varieties of peanut: Tuban, Hypoma 2, Bima, Kelinci and Gajah. The parameters observed were soil bulk density, permeability, total soil porosity, aggregate stability index, soil water holding capacity at water potential -3 and -15 bar.  Results of our studies showed soil amandement improves some soil physical properties, combination amendment with variety of peanuts resulted significant effects to soil physical properties, and combination treatments mostly influenced soil physical properties at soil depth of 0 -20 cm.  Addition of 10 tons ha -1 cow manure or 10 ton ha -1  straw compost  is enough to improve soil physical properties

Lack of Stability of Aggregates after Thrombin-Induced Reaggregation of Thrombin-Degranulated Platelets

1992 ◽  
Vol 67 (04) ◽  
pp. 453-457 ◽  
Author(s):  
Raelene L Kinlough-Rathbone ◽  
Marian A Packham ◽  
Dennis W Perry ◽  
J Fraser Mustard ◽  
Marco Cattaneo
Keyword(s):  
Von Willebrand Factor ◽  
Platelet Rich Plasma ◽  
Thrombus Formation ◽  
Aggregate Stability ◽  
Relative Importance ◽  
Platelet Aggregates ◽  
The Stability ◽  
Von Willebrand ◽  
Induced Aggregation ◽  
Willebrand Factor

SummaryThe stability of platelet aggregates is influenced by the extent of the release of granule contents; if release is extensive and aggregation is prolonged, deaggregation is difficult to achieve. The relative importance of the contributions of released substances to aggregate stability are not known, although stable thrombin-induced aggregates form in platelet-rich plasma from patients with barely detectable plasma or platelet fibrinogen, and ADP stabilizes thrombin-induced aggregates of platelets from patients with delta storage pool deficiency which otherwise deaggregate more readily than normal platelets. We degranulated platelets with thrombin (0.9 U/ml caused greater than 90% loss of delta and alpha granule contents) and recovered them as individual platelets in fresh medium. The degranulated platelets were reaggregated by thrombin (2 U/ml). To prevent continuing effects of thrombin, FPRCH2C1 was added when thrombin-induced aggregation of thrombin-degranulated platelets reached its maximum. EDTA (5 mM) or EGTA (5 mM) added at maximum aggregation did not deaggregate these platelets, indicating that the stability of these aggregates does not depend on Ca2+ in the medium. Whereas with control platelets a combination of PGE1 (10 μM) and chymotrypsin(10 U/ml) was required for deaggregation, with thrombin-degranulated platelets either PGE1 or chymo-trypsin alone caused extensive deaggregation. The rate and extent of deaggregation of thrombin-degranulated platelets by a combination of PGE1 and chymotrypsin was greater than with control platelets.Electron microscope gold immunocytochemistry using antihuman fibrinogen IgG, anti-von Willebrand factor and anti-fibronectin showed a) that fibrinogen in the vacuoles of degranulated platelets was visible at focal points of platelet contact in the aggregates, but that large areas of platelet contact had no fibrinogen detectable between them; and b) in comparison to fibrinogen, little fibronectin or von Willebrand factor (vWf) was detectable in the platelets.Since the linkages between thrombin-degranulated platelets reaggregated by thrombin can be disrupted either by raising cAMP (thus making glycoprotein IIb/IIIa unavailable) or by proteolysis, these linkages are less stable than those formed between normal platelets. It might therefore be expected that platelets that take part in thrombus formation and then recirculate are likely to form less stable thrombi than platelets that have not released their granule contents.

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