Modelling the effect of soil moisture on germination and emergence of wheat and sugar beet with the minimum number of parameters

A - Papers appearing in refereed journals

Rinaldi, M., Di Paolo. E., Richter, G. M. and Payne, R. W. 2005. Modelling the effect of soil moisture on germination and emergence of wheat and sugar beet with the minimum number of parameters. Annals of Applied Biology. 147 (1), pp. 69-80.

AuthorsRinaldi, M., Di Paolo. E., Richter, G. M. and Payne, R. W.
Abstract

Soil moisture and temperature, sowing depth and penetration resistance affect the time and percentage of seedling emergence, which are crucial for the simulation of drought-limited crop production. The aim of this research was to measure the effect of soil water potential on germination and emergence, shoot and root elongation rates (SER and RER) of two different seed/crop types. Sugar beet and durum wheat seeds were sown into two soils (clay and loam), submitted to five matric potentials (-0.01, -0.1, -0.2, -0.4 and -0.8 MPa) and incubated at constant temperature (25 degrees C) and humidity. Cumulative count analysis was used to estimate parameters of the distribution of germination or emergence times for each box of beet or wheat seeds and to derive estimates for base potentials (psi(b)), hydrothermal times (H) and numbers of viable units. In a second experiment, NaCl solution was used to mimic the soil matric potentials to estimate potential RER and SER. Germination of sugar beet was slightly more sensitive to matric potential than durum wheat (psi(b) Of - 1.13 and - 1.23 MPa, respectively). H-(g) was longer for sugar beet than for durum wheat (67 vs 47 MPa degrees Cd). For emergence Ob was similar for both seed types and soils but hydrothermal times (H-(e)) were 40 MPa degrees Cd higher for sugar beet than for wheat. Emergence was about 20 MPa degrees Cd earlier in loam than in clay. SER measured in soils were similar for both crops and for durum wheat it agreed with those determined in NaCl solution. RER and SER fell with decreasing osmotic potential to approximately 20% of their maximum values (1.03 rum h(-1) and 0.57 mm h(-1), respectively). Seedling viability decreased with decreasing matric potential and more in clay than in loam soil and more for sugar beet than durum wheat. Seed and soil aggregate size are discussed with respect to the effects of water diffusion and soil-seed contact on germination and emergence modelling.

KeywordsAgriculture, Multidisciplinary
Year of Publication2005
JournalAnnals of Applied Biology
Journal citation147 (1), pp. 69-80
Digital Object Identifier (DOI)doi:10.1111/j.1744-7348.2005.00018.x
Open accessPublished as non-open access
Funder project or code511
513
ISSN00034746
PublisherWiley

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