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Soil and Tillage Research
Collins, G., Roseworthy Agricultural College, Roseworthy, SA 5371, Australia
Stibbe, E., Agricultural Research Organisation, Institute of Soils and Water, P.O. Box 6, Bet Dagan, 50200, Israel
Kroesbergen, B., Tillage Laboratory, the Agricultural University, Diedenweg 20, 6703 Wageningen, Netherlands
The imbibition of corn seeds (Zea mays L.) was examined in a sandy soil compacted to simulate the effect that might be expected from pressure wheels behind a planting machine. Water uptake was found to be exponential and to be the only factor contributing to the increase in volume of the seed during imbibition. Changes in bulk density of the soil over the range from 0.90 to 1.31 Mg cm-3 produced no significant effects on water uptake. It was therefore concluded that the degree of contact between seed coat and soil particles is not an important factor in influencing the rate of imbibition of corn seeds under the specific conditions which were examined. Water flux into the seeds was calculated to be several orders of magnitude lower than bulk soil water flux at all soil water potentials tested. Estimates of seed coat permeability suggest that, for corn, this factor is the major restriction on entry of water into the seed during imbibition. At a field level, the widespread use of pressure wheels behind corn planters as a means of increasing seed/soil contact appears not to be necessary in sandy soils. © 1984.
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Influence of soil moisture stress and soil bulk density on the imbibition of corn seeds in a sandy soil
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Collins, G., Roseworthy Agricultural College, Roseworthy, SA 5371, Australia
Stibbe, E., Agricultural Research Organisation, Institute of Soils and Water, P.O. Box 6, Bet Dagan, 50200, Israel
Kroesbergen, B., Tillage Laboratory, the Agricultural University, Diedenweg 20, 6703 Wageningen, Netherlands
Influence of soil moisture stress and soil bulk density on the imbibition of corn seeds in a sandy soil
The imbibition of corn seeds (Zea mays L.) was examined in a sandy soil compacted to simulate the effect that might be expected from pressure wheels behind a planting machine. Water uptake was found to be exponential and to be the only factor contributing to the increase in volume of the seed during imbibition. Changes in bulk density of the soil over the range from 0.90 to 1.31 Mg cm-3 produced no significant effects on water uptake. It was therefore concluded that the degree of contact between seed coat and soil particles is not an important factor in influencing the rate of imbibition of corn seeds under the specific conditions which were examined. Water flux into the seeds was calculated to be several orders of magnitude lower than bulk soil water flux at all soil water potentials tested. Estimates of seed coat permeability suggest that, for corn, this factor is the major restriction on entry of water into the seed during imbibition. At a field level, the widespread use of pressure wheels behind corn planters as a means of increasing seed/soil contact appears not to be necessary in sandy soils. © 1984.
Scientific Publication
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