Preliminary investigations of sand growth media for cotula

Murphy, J. W.; Nelson, S. H.

doi:10.1080/03015521.1979.10426199

Cited by 2 publications

(8 citation statements)

References 5 publications

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“…The porosity of the 5 aggregate size ranges, as well as the other physical characteristics, have been previously published (Murphy & Nelson 1979 Table 2 and there were highly significant differences among the 22 mixtures. The results, however, do not show a trend based on the amount of the finest aggregate, but rather an apparent interaction between the finest « 0.5 mm) and the coarsest aggregate (1.5 -3.0 mm).…”

Section: Porositymentioning

confidence: 91%

“…Root penetration (in glass-fronted containers) was measured weekly (Murphy & Nelson 1979). At the end of the experiment the dry weight of the roots was determined in four equal (7.5 cm) horizontal divisions of the root zone in all experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The source, porosity, capillary uptake, visible perching, percolation rates, moisture retention, and wa1er-air relations in the pore space have been described by Murphy & Nelson (1979).…”

Section: Methodsmentioning

confidence: 99%

“…In the third experiment 22 mixtures containing various percentages by volume of the aggregate size ranges (bulk density of 1.6250,1.5815, 1.5065, 1.5185, and 1.5900) were used. Because of the reduction in percolation and root growth in the < 0.5 mm size range (Murphy & Nelson 1979), this aggregate was limited to a maximum of 20%; other aggregates ranged from 15 to 40%.…”

Section: Methodsmentioning

confidence: 99%

“…Only percolation rates were established for the layered profiles but with the mixtures, capillary uptake, porosity, and percolation rates, as well as moisture retention and the percentage of pore space filled with water at various distances from the perched water layer, were determined by methods used in a previous experiment (Murphy & Nelson 1979).…”

Section: Methodsmentioning

confidence: 99%

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Physical characteristics of particle size and distribution on Penncross bentgrass

Nelson

Murphy²

1979

New Zealand Journal of Experimental Agriculture

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Five size ranges of sand and gravel aggregate, as well as mixtures of various proportions of the aggregate size ranges, were used as media to grow Penncross bentgrass (Agrostis palustris Hud.). Rate of root elongation and root dry weight were noticeably reduced when the finest grade aggregate ( < 0.5 mm) was used alone. The intermediate size ranges of 0.5 -1.0 mm appeared best suited to root growth. However, in the mixtures, where the finest size range was limited to a maximum of 20% by volume, there was no significant difference in root mass. The high percolation rates in the 2 coarsest aggregates (1.5 -3.00 mm and 1.0 -1.5 mm), and the lower percolation rate and particularly the amount of pore space filled with water in the finest grade, made this aggregate unsatisfactory for root growth. Capillary uptake and the amount of water in the pore space rose, and the percolation rates fell, as the amount of the finest aggregate in the mixture increased. Layers of the finest material in the profile severely reduced percolation and root penetration.

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Section: Porositymentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

“…The source, porosity, capillary uptake, visible perching, percolation rates, moisture retention, and wa1er-air relations in the pore space have been described by Murphy & Nelson (1979).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Physical characteristics of particle size and distribution on Penncross bentgrass

Nelson

Murphy²

1979

New Zealand Journal of Experimental Agriculture

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Effects of turf on percolation and water holding capacity of three sand mixtures

Murphy¹,

Nelson

1979

New Zealand Journal of Experimental Agriculture

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Penncross (Agrostis palustris Hud.) turf, grown on 3 sand mixtures containing 15,20, and 25% of aggregate size less than 0.5 mm, was sampled after 6.5 months. There was no difference in top or root growth on the 3 mixtures. The presence of turf greatly reduced percolation rates. Compaction of the turf in a saturated .:ondition further reduced percolation. Water retention and percentage pore space filled with water at the surface, were increased in the presence of turf. Lower in the profile, however, the presence of roots generally decreased moisture retention and percentage pore space filled with water. Under New Zealand conditions of high precipitation not more than 20% of the fine aggregate « 0.5 mm) should be used in mixtures because of the low percolation rates.

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Preliminary investigations of sand growth media for cotula

Cited by 2 publications

References 5 publications

Physical characteristics of particle size and distribution on Penncross bentgrass

Physical characteristics of particle size and distribution on Penncross bentgrass

Effects of turf on percolation and water holding capacity of three sand mixtures

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