The low PAWC
under RRR relative to RUR and RUU appears to be due primarily to a decrease in the number of pores, which is consistent with the low matrix porosity of RRR relative to the other cropping systems.
Yield is a function of PAWC
at sowing and ICR, whereas PAWC
could be defined as DUL-CLL.
Gypsum application increases grain yield by reducing the degree of dispersion, reducing high levels of sodium with calcium, thereby improve calcium nutrition, increasing PAWC
and reducing salt load in the rooting depth (Rengasamy et al.
At the Oxisol site, however, lack of profile moisture and the low PAWC
of this soil type necessitated more frequent irrigations, with a total of 168 mm applied in five irrigation events from early January to mid-February 2014 (Table 2).
On a soil with low PAWC
the reductions in deep drainage were greater than for a soil with high PAWC
was 156mm under cropping and 180mm under pasture.
8 t/ha) across zones with different PAWC
, but in a below-average season, the variation might only be 1.
Recent studies have estimated PAWC
and soil depth from geophysical data (Wong et al.
We model the benefits from SOC of changed nutrient availability (specifically nitrogen) and PAWC
The PPG and NF fields depicted similar mean values of PAWC
, which were significantly higher than that of CC (by 66.
In this paper, we have chosen to develop PTFs for DUL and LL to allow calculation of PAWC
from these values.
In this pot trial in Texas, USA, correcting for the increased depth of the A horizon after mixing showed an increase in PAWC
for all three soils.