The volumetric water contents in soil were 23.4 ± 0.3%
(mean ± SD), 15.3 ± 2.9%, and 10.2 ± 2.5%, respectively, during the
culture period in plots irrigated every day, every three days and
every six days. The water was mostly saturated in the soil irrigated
every day, because the water holding capacity in this field
was corresponding to 25% volumetric water content. Each of the
dry weights of tuberous roots and shoot (leaves + stems) in the
plot irrigated every three days were greatest among all treatments
(Fig. 3). From the supplementary soil ridge experiment with
Brussels sprouts, CO2 concentrations (Cs) increased linearly with
increasing volumetric water contents (Ws) in the soil ridge following
the equation, Cs = 0.102Ws − 1.018 (r2 = 0.929, n = 42). Therefore
CO2 concentrations in soil ridges with sweet potato irrigated every
day (the volumetric water content: 23.4%), every three days (15.3%),
and every six days (10.2%) were estimated to be 1.4%, 0.5%, and
0.02%, respectively.
The volumetric water contents in soil were 23.4 ± 0.3%(mean ± SD), 15.3 ± 2.9%, and 10.2 ± 2.5%, respectively, during theculture period in plots irrigated every day, every three days andevery six days. The water was mostly saturated in the soil irrigatedevery day, because the water holding capacity in this fieldwas corresponding to 25% volumetric water content. Each of thedry weights of tuberous roots and shoot (leaves + stems) in theplot irrigated every three days were greatest among all treatments(Fig. 3). From the supplementary soil ridge experiment withBrussels sprouts, CO2 concentrations (Cs) increased linearly withincreasing volumetric water contents (Ws) in the soil ridge followingthe equation, Cs = 0.102Ws − 1.018 (r2 = 0.929, n = 42). ThereforeCO2 concentrations in soil ridges with sweet potato irrigated everyday (the volumetric water content: 23.4%), every three days (15.3%),and every six days (10.2%) were estimated to be 1.4%, 0.5%, and0.02%, respectively.
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