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Biology Articles » Agriculture » Controlled alternate partial root-zone irrigation: its physiological consequences and impact on water use efficiency » Tables

Tables
- Controlled alternate partial root-zone irrigation: its physiological consequences and impact on water use efficiency

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Table 1. Leaf photosynthesis rate (Pn, µmol CO2 m–2 s–1), transpiration rate (Tr, µmol H2O m–2 s–1) and water use efficiency (WUE, µmol CO2 µmol–1 H2O) of maize grown in arid area in the year of 1998


Terms

Treat-ments

Irrigation water use each time (m3 h–1 m–2)

Measured date (before or after each irrigation)





B1

A1

B2

A2

A4

B5

Average

Pn CFI 450 11.7 20.8 13.2 19.3 21.4 10.3 16.1
    300 10.8 15.3 7.4 16.3 19.0 9.9 12.9
    225 6.7 16.3 5.4 14.3 17.3 6.3 11.1
  FFI 450 13.6 16.1 12.3 15.4 17.5 12.7 14.6
    300 9.6 14.3 10.3 14.0 16.1 13.0 12.9
    225 9.0 14.5 10.0 13.8 13.4 10.9 10.3
  AFI 450 14.3 16.3 13.8 16.9 17.6 15.4 15.7
    300 12.3 16.1 12.9 17.2 16.0 14.8 14.9
    225 11.0 15.2 10.3 16.4 18.5 13.3 14.1
Tr CFI 450 2.96 5.31 3.21 6.11 6.73 3.21 4.05
    300 2.30 4.96 2.87 5.80 5.31 2.96 4.40
    225 2.12 5.06 2.33 6.12 5.24 2.10 3.83
  FFI 450 2.72 3.21 1.94 4.00 3.45 2.15 2.91
    300 2.16 3.42 1.66 3.91 3.55 2.46 2.86
    225 1.52 3.67 5.60 3.52 3.28 2.17 3.29
  AFI 450 3.01 4.15 2.89 4.63 4.24 2.85 3.62
    300 2.53 4.16 2.43 4.51 4.40 2.36 3.39
    225 1.96 3.90 1.74 3.72 4.10 2.17 2.93
WUE CFI 450 3.95 3.92 4.12 3.14 3.18 3.21 3.98
    300 4.69 3.08 2.56 2.81 3.58 3.35 3.300
    225 3.19 3.22 2.32 2.34 3.30 3.01 2.89
  FFI 450 5.00 5.02 6.34 3.85 5.07 5.91 5.03
    300 4.44 4.18 6.300 3.58 4.54 5.28 4.50
    225 5.92 3.95 1.79 3.92 4.07 5.02 3.13
  AFI 450 4.75 3.93 4.78 3.65 4.15 5.40 4.34
    300 4.86 3.87 5.31 3.81 3.64 6.27 4.39




225

5.61

3.89

5.92

4.41

4.51

6.13

4.82

AFI, FFI and CFI are alternate, fixed and conventional furrow irrigation, respectively. Values are means of three plots for each treatment.

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Table 2. Root and trunk water flows of pear trees in an orchard under three irrigation methods


Treatments

DAB

Root sap flow (l)


Trunk sap flowa

    Total (l)

Average (l d–1)

Total (l) Average (l d–1) (mm d–1)




West

East

West

East







WRI 0–26 160.68 a 151.32 a 6.18 a 5.82 a 1704.82 65.57 3.65
  27–35 59.40 a 56.97 a 6.60 a 6.33 a 607.32 67.48 3.76
  36–66 211.11 a 218.55 a 6.81 a 7.05 a 2880.83 92.93 5.17
  67–89 164.34 a 159.27 a 7.14 a 6.93 a 2314.93 100.65 5.6
  0–89 595.53 a 586.11 a 6.69 a 6.59 a 7507.90 84.36 4.69
  27–89 434.85 434.79 6.9 6.90 5803.08 92.11 5.12
FPRI 0–26 154.92 a 151.38 a 5.97 a 5.82 a 1581.06 60.81 3.39
  27–35 67.23 a 34.29 b 7.47 a 3.81 b 485.73* 53.97* 3.01*
  36–66 269.70 a 129.27 b 8.70 a 4.17 b 2319.11* 74.81* 4.17*
  67–89 190.50 a 113.16 b 8.28 a 4.92 b 1952.84* 84.91* 4.73*
  0–89 682.35 a 428.10 b 7.67 a 4.81 b 6338.74* 71.22* 3.96*
  27–89 527.43 a 276.72 b 8.37 a 4.39 b 4757.68* 75.72* 4.20*
APRI 0–26 152.58 a 154.68 a 6.33 a 6.18 a 1598.48 61.48 3.42
  27–35 33.48 b 63.72 a 3.72 b 7.08 a 477.66* 53.07* 2.96*
  36–66 226.77 a 136.59 b 7.32 a 4.41 b 2480.62*{dagger} 80.02*{dagger} 4.46*{dagger}
  67–89 126.96 b 200.79 a 5.52 b 8.73 a 2263.64*{dagger} 98.41*{dagger} 5.48*{dagger}
  0–89 539.49 a 555.78 a 6.06 a 6.24 a 6820.40*{dagger} 76.63*{dagger} 4.26*{dagger}


27–89

387.21 a

401.10 a

6.15 a

6.37 a

5221.92*{dagger}

82.89*{dagger}

4.61*{dagger}

APRI, alternative partial root-zone irrigation; FPRI, fixed partial root-zone irrigation; WRI, the whole root-zone irrigation. Data are means of four measurements under the same treatment. Letters following numbers of consumptive water use indicate statistical significance of difference when the west and east sides within the same treatment were compared at P0.05 level (same letters indicate a non-significant difference). DAB means days after beginning of the experiment (Kang et al., 2002a)

a* Statistical significance at P≤0.05 level when compared with the corresponding values of WRI at the same experimental period. {dagger} Statistical significance at P≤0.05 level of trunk sap flow in APRI compared with the corresponding values of FPRI in the same experimental period.

http://www.biology-online.org/articles/references-controlled_alternate_partial_root-zone_irrigation_its_physiological_consequences_and_impact_on_water_use_efficiency.htm

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Source: Journal of Experimental Botany 2004 55(407):2437-2446 


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