25
Total rainfall during the experimental period was 71mm,
81.mm and 115 mm in year one, year two and year three
respectively. Before cotton emerged, all treatment plots were
irrigated with the same amount of water to ensure uniform
germination. After that, irrigation treatments were triggered
by different SMP thresholds.
Higher SMP threshold resulted in longer irrigation times and
hence greater amounts of irrigation being applied
(See Table
Three)
. The highest quantity of irrigation water was applied
in S1
(-5 kPa)
each year, while the maximum
(665.6 mm)
was applied in year one.
Spatial and temporal changes in soil nutrients
Soil N
In this study, soil inorganicN
(NO3 - -NandNH4+ -N)
distribution
within 40 cm depth was analyzed after irrigation ceased for
each treatment in year two. The two types of inorganic N
accumulated mainly in the upper soil layer
(0-20 cm)
.
$Iter the first groZing seDson D significDnt increDse in totDO
N was observed in the upper 40 cm of soil in all treatments,
compared with those before seeding.
Soil available P
7he soiO DYDiODbOe 3 distribXtions in the soiO SrofiOe Zere
siPiODr to those Ior soiO inorgDnic 1 %y the end oI the finDO
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Table : The concentration of total N and available 3 and . and inorganic N NO N and NH N at the test
site in ;inMiang Northwest
Soil depth
(cms)
Total N
(%)
Available P
mg kg
1)
Available .
mg kg
1)
NO
²
N
mg kg
1)
NH
²
N
mg kg
1)
0-30
0.03
4.06
115.4
8.4
18.7
31-60
0.02
2.44
119.5
10.6
9.9
61-90
0.02
1.83
132.0
10.3
10.8
91-120
0.01
2.23
82.4
11.1
9.9
121-180
0.02
0.81
701.
11.5
9.0