Zwart_Bastiaanssen_2004_Review of measured crop water productivity values for irrigated wheat, rice,
Zwart_Bastiaanssen_2004_Review of measured crop water productivity values for irrigated wheat, rice,
Zwart_Bastiaanssen_2004_Review of measured crop water productivity values for irrigated wheat, rice,
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S.J. <strong>Zwart</strong>, W.G.M. <strong>Bastiaanssen</strong> / Agricultural Water Management 69 (<strong>2004</strong>) 115–133 121<br />
the plants, thus reducing soil evaporation and improving soil <strong>water</strong> status <strong>of</strong> the root zone.<br />
Saranga et al. (1998) <strong>measured</strong> average lint yield <strong>values</strong> <strong>of</strong> 1300 kg ha −1 in a field trial with<br />
deficit irrigation, while seasonal ET act was very low with 390 mm (see Fig. 2c). Howell<br />
et al. (1984) <strong>measured</strong> similar <strong>values</strong> (0.33 kg m −3 ) in an experiment with high frequency<br />
trickle irrigation and reduced <strong>water</strong> deficits management <strong>for</strong> narrow row cotton in Cali<strong>for</strong>nia<br />
(USA). Lint yield was more than 2000 kg m −3 , while seasonal ET act was relatively<br />
low (617 mm). The range <strong>for</strong> cotton seed yield is with 0.41–0.95 kg m −3 higher than the<br />
range given in FAO33 (0.4–0.6 kg m −3 ). In Argentina maximum <strong>values</strong> were <strong>measured</strong><br />
12000<br />
9000<br />
r 2 = 0.35<br />
Y act<br />
(kg)<br />
6000<br />
3000<br />
(a)<br />
0<br />
0 200 400 600 800<br />
ET act (mm)<br />
12000<br />
9000<br />
Y act<br />
(kg)<br />
6000<br />
r 2 = 0.09<br />
3000<br />
(b)<br />
0<br />
0 200 400 600 800 1000 1200 1400<br />
ET act<br />
(mm)<br />
Fig. 2. Yield–evapotranspiration relations <strong>of</strong> (a) <strong>wheat</strong>, (b) <strong>rice</strong>, (c) cotton and (d) maize.
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