A note on the capillary rise of water in soils

1919 ◽  
Vol 9 (4) ◽  
pp. 396-399 ◽  
Author(s):  
Bernard A. Keen

Very diverse views are expressed on the height to which water can rise in soils under the forces of capillarity. Alway and MacDole in the course of a brief historical review, point out that these estimates range from two or three feet only, to as much as two or three kilometres, although the majority do not exceed 200 feet. Most of the investigators who advance a high value for the capillary rise are careful to point out that in all probability the movement of water in this case would be exceedingly slow, owing to the excessive friction in the minute capillary spaces. Actual experiments on the rise of water in tubes of compacted soil result in low values, which are in all probability exceeded in the field. Warington in his book Physical Properties of Soil gives a typical table showing the results of Loughridgeb for Californian soils.

2017 ◽  
Vol 29 (3) ◽  
pp. 04016225 ◽  
Author(s):  
Diego Alejandro Gutiérrez-Orrego ◽  
Edwin Fabián Garcia-Aristizabal ◽  
Maryory Astrid Gomez-Botero

2017 ◽  
Vol 15 (3) ◽  
Author(s):  
Sandi Aji ◽  
Afandi Afandi ◽  
Lestari Wibowo ◽  
K.E.S. Manik

This research was conducted in the planting area of pineapple (Ananas comosus) PT. GGP Terbanggi Besar Central Lampung indicated attacked by pests simphylid in March 2014 until May 2014. Analysis of soil physical properties carried out in the Laboratory of Soil Science, Department of Agrotechnology, Faculty of Agriculture, University of Lampung. The method used in this study is a survey method. Soil sampling conducted at three locations indicated simphylid pests. Soil sampling done at some point and some depth. Results from this research that pest symphilid most numerous in one location with a number of acquisition 172 tail where the location of the physical properties of good land which the density value of the content is low, the total pore low, macropores and high hardness low ground , allowing sinphylid be able to live and thrive. While at the location of two and three with the condition density value of the content is high, the total pore high, macropores low, and violence high soil pests simphylid not so much discovered as simphylid can not multiply and survive on the physical condition of poor soil Keywords: Pineapple, Symphilid, and physical properties of soil


Author(s):  
L. Raus ◽  
G. Jitareanu

Optimal crop rooting soil physical conditions are a result of complex interactions between soil strength and oxygen and water supply to plant roots. Spatial/temporal variability in soil properties can be critical in the evaluation of the effects of tillage management practice on soil and crop parameters. In this paper tillage were evaluated for theirs effects on soil physical and hydrological properties. Tillage treatments were plough to 20 cm, plough to 30 cm, chisel and disc harrow applied to wheat in to been/ wheat/ maize rotation. The experiments have been conducted in the Didactic Station of the USAMV – Iasi, Ezăreni Farm, during the period between 2002-2004, on a cambic chernozem with 3,4 % humus and pH 7. Tillage system modify, at least temporarily, some of the physical properties of soil, such as soil bulk density, penetration resistance, soil porosity and soil structural stability. Hydraulic properties of the soil did not differ significantly. All the tillage operation was significantly different in their effects on soil properties.


2005 ◽  
Vol 45 (1) ◽  
pp. 65-72 ◽  
Author(s):  
Arvydas Kanapickas ◽  
Jonas Mažeika ◽  
I. Paulaitienė ◽  
Ieva Baužienė

Author(s):  
David Lindbo ◽  
David L. L indbo ◽  
Deb A. Kozlowski ◽  
Clay Robinson ◽  
Wale Adewunmi ◽  
...  

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