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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