Measuring air-filled porosity changes in an irrigated swelling clay soil

1986 ◽  
Vol 23 (1) ◽  
pp. A11
Keyword(s):  
Clay Soil ◽  
Swelling Clay ◽  
Porosity Changes

Studies on potassium. IV. Interspecific differences in the uptake of non-exchangeable potassium

Soil Research ◽  
1974 ◽  
Vol 12 (2) ◽  
pp. 147 ◽  
Author(s):  
IF Fergus ◽  
AE Martin
Keyword(s):  
Soil Solution ◽  
Clay Soil ◽  
Plant Roots ◽  
Exchangeable Potassium ◽  
Swelling Clay ◽  
Rhodes Grass ◽  
Interspecific Differences ◽  
Chloris Gayana ◽  
Macroptilium Atropurpureum ◽  
Plant Removal

Five soils were cropped with four plant species in pot experiments in the glasshouse, without addition of potassium, until growth virtually ceased, after which the depleted soils were replanted with either the same species, or a different one, to test the reproducibility of the 'exhaustion' conditions imposed. Uptake of potassium by the plants exceeded the changes in exchangeable potassium in four soils; the excess amounts taken up differed markedly between species and these differences were reproducible on replanting. Uptake by setaria (Setaria anceps) and siratro (Macroptilium atropurpureum) exceeded that by Rhodes grass (Chloris gayana) and lucerne (Medicago sativa), except for one swelling clay soil from which uptake by lucerne equalled that by siratro. Most of the differences between species were attributed to the uptake of initially non-exchangeable potassium, which was removed in significant amounts from three of the soils. For these three soils, uptake from non-exchangeable sources was detected only after about 80% of the exchangeable potassium had been removed. It is postulated that the efficiency of plant removal of non-exchangeable potassium from soil is directly related to the degree to which plant roots can lower the concentration of potassium in the soil solution.

Disposition of Fertilizer Nitrate Applied to a Swelling Clay Soil in the Field

1976 ◽  
Vol 5 (1) ◽  
pp. 66-71 ◽  
Author(s):  
D. E. Kissel ◽  
S. J. Smith ◽  
D. W. Dillow
Keyword(s):  
Clay Soil ◽  
Swelling Clay

Field studies of water and salt movement in an irrigated swelling clay soil. I. Infiltration during ponding

Soil Research ◽  
1982 ◽  
Vol 20 (2) ◽  
pp. 81 ◽  
Author(s):  
DS McIntyre ◽  
J Loveday ◽  
CL Watson
Keyword(s):  
Clay Soil ◽  
New South ◽  
Infiltration Rate ◽  
Field Studies ◽  
Deep Percolation ◽  
Soil Infiltration ◽  
Swelling Clay ◽  
South Wales ◽  
Plough Layer ◽  
Water And Salt Movement

Infiltration and deep percolation were measured during ponding of a saline sodic cracking clay soil, commonly used for rice production in the Riverina of New South Wales. Because gypsum may be used to ameliorate this soil for row cropping, the effect of incorporating gypsum into the plough layer was determined. Without gypsum, 292mm water infiltrated in 379 days of ponding, wetting the profile to approximately 2.1 m. In contrast when gypsum was incorporated in the plough layer, 605 mm of water infiltrated in 145 days, and water had penetrated beyond 4.5 m in 57 days. In the latter case, sufficient water percolated below 2.0m to raise the groundwater level by as much as 10m. The infiltration rate for the unameliorated soil was similar to values determined by others; for the ameliorated soil, infiltration behaviour was more like that of non-sodic self-mulching grey or brown clays, and raises questions regarding the amount of deep percolation when rice is grown on such soils.

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