Predicting soil water retention characteristics from soil physical and chemical properties

1991 ◽  
Vol 22 (17-18) ◽  
pp. 1847-1860 ◽  
Author(s):  
L.A. Manrique ◽  
C.A. Jones ◽  
P.T. Dyke
Keyword(s):  
Soil Water ◽  
Water Retention ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Soil Water Retention ◽  
Retention Characteristics ◽  
Physical And Chemical ◽  
And Chemical Properties

Effects of subsoil amendments on soil physical properties, crop response, and soil water quality in a dry year

Soil Research ◽  
2010 ◽  
Vol 48 (2) ◽  
pp. 140 ◽  
Author(s):  
T. M. McBeath ◽  
C. D. Grant ◽  
R. S. Murray ◽  
D. J. Chittleborough
Keyword(s):  
Soil Water ◽  
Chemical Properties ◽  
Crop Productivity ◽  
Residual Effects ◽  
Physical And Chemical Properties ◽  
Deep Placement ◽  
Growing Seasons ◽  
Texture Contrast ◽  
Physical And Chemical ◽  
And Chemical Properties

In southern Australia the ability of field crops to extract soil moisture and nutrients from depth depends on the physical and chemical properties of the subsoil. In texture-contrast soils accumulation of water and nutrients in the E or A2 horizon, immediately above a clay B horizon of much lower hydraulic conductivity (herein called the interface), may generate lateral flows and enhanced nutrient and solute transfer to water bodies. Evidence that deep-ripping with addition of subsoil nutrients can increase crop productivity in regions having hostile, alkaline subsoils led to experiments to test whether this response was related to an increase in the use of water and nutrients in the subsoil. Our study measured the effects of deep-ripping with and without amendments on soil physical and chemical properties of the A and upper B horizons of 2 South Australian soils. Deep-ripping and deep-placement of nutrients increased grain harvest weight even in an exceptionally dry season. The greater yield was accompanied by significantly lower field-penetration resistance to 0.35–0.50 m depth, which we hypothesise enabled the crop to better access stored soil water and deep placed nutrients in the subsoil. Residual effects from deep-ripping were minimal after 4 growing seasons; therefore, ripping will need to be practiced at regular intervals to maintain treatment effects. The ripping and nutrient amendments had no significant effect on exchangeable sodium percentage, electrical conductivity, and readily extractable phosphorus and nitrate-nitrogen, despite changes in these soil properties between spring and harvest sampling.

Fertilization effects of compost produced from maize, sewage sludge and biochar on soil water retention and chemical properties

2020 ◽  
Vol 197 ◽  
pp. 104493 ◽  
Author(s):  
Tomasz Głąb ◽  
Andrzej Żabiński ◽  
Urszula Sadowska ◽  
Krzysztof Gondek ◽  
Michał Kopeć ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Soil Water ◽  
Water Retention ◽  
Chemical Properties ◽  
Soil Water Retention ◽  
Fertilization Effects ◽  
And Chemical Properties

scholarly journals Review on uranium in soil: levels, migration

2020 ◽  
pp. 117-132
Author(s):  
N. I. Sanzharova ◽  
A. N. Ratnikov ◽  
S. V. Fesenko ◽  
D. G. Sviridenko
Keyword(s):  
Soil Water ◽  
Natural Radionuclides ◽  
Chemical Properties ◽  
Soil Types ◽  
Physical And Chemical Properties ◽  
Additional Source ◽  
Phosphorus Fertilizers ◽  
And Migration ◽  
Physical And Chemical ◽  
And Chemical Properties

The problems of radioactive contamination of biosphere with the 238U in recent years have attracted a large number of experts in various fields of knowledge. Natural radionuclides are an integral part of the biosphere. They are concentrated everywhere: in rocks, in soil, water, air and food. Various types of phosphorus fertilizers and other natural ameliorants used in agriculture are also an additional source of heavy natural radionuclides. The review describes the behaviour and migration of 238U in biosphere, which depend on various factors acting simultaneously. It is noted that the behaviour of 238U in the soil depends on the forms of its presence in it and the physical and chemical properties of the soil. The processes of sorption and desorption of 238U by different soil types are significant indicators.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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