Agriculture Reference
In-Depth Information
Fig. 4.17.
The effects of mechanical impedance on the elongation of emerging
onion seedlings. (a) The shoot length of onion seedlings growing at 20°C in
environments of constant strength: on sloping filter paper (
); in sand cultures with
pressure resistances to a penetrometer of 0.19 (
) and 0.75 (
)
MPa. The bars indicate the standard deviations for the means, which were based on
30 replicates of each treatment. The curves shown were obtained using Eqn 4.12.
(b) The growth in root length for the same as seedlings in (a) (from Whalley
et al
.,
1999. Courtesy of
Plant, Cell and Environment
).
●
), 0.39 (
▫
), 0.53 (
