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Evapotranspiration and crop coefficient of spring maize with plastic mulch using eddy covariance in northwest China

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  • Li, Sien
  • Kang, Shaozhong
  • Li, Fusheng
  • Zhang, Lu

Abstract

Spring maize under plastic mulch is the staple food crop in northwest China. Studying its evapotranspiration (ET) and crop coefficient (Kc) is important for managing water-saving irrigation in the region. Eddy covariance (EC) was applied to measure spring maize ET in 2007 in northwest China, focusing on the characteristics of the maize ET and Kc processes under plastic mulch. An interesting result was that a higher Kc in this study relative to the value of FAO 56 was presented in the mid and late season, e.g. average Kc was 1.46, 1.39 and 1.22 during the heading, filling and maturity stage, respectively. This result was mainly due to that (1) the plastic mulch had an effect on anti-senescence of maize and great green leaf still existed before the harvest; (2) the FAO 56 PM model may underestimate the reference crop ET in the mid and late season of maize in the region; (3) the planting density was higher in the study, which was about 374,800 plants ha-1. Though Kc during the mid and late season was high, a high water use efficiency of 25.2 kg ha-1 mm-1 was still obtained in the study. Our study confirmed that plastic mulch has beneficial effect on improving maize water use efficiency in this severe water shortage region of northwest China.

Suggested Citation

  • Li, Sien & Kang, Shaozhong & Li, Fusheng & Zhang, Lu, 2008. "Evapotranspiration and crop coefficient of spring maize with plastic mulch using eddy covariance in northwest China," Agricultural Water Management, Elsevier, vol. 95(11), pages 1214-1222, November.
    • Handle: RePEc:eee:agiwat:v:95:y:2008:i:11:p:1214-1222
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    1. Watanabe, Kota & Yamamoto, Takashi & Yamada, Takashi & Sakuratani, Tetsuo & Nawata, Eiji & Noichana, Chairat & Sributta, Akadet & Higuchi, Hirokazu, 2004. "Changes in seasonal evapotranspiration, soil water content, and crop coefficients in sugarcane, cassava, and maize fields in Northeast Thailand," Agricultural Water Management, Elsevier, vol. 67(2), pages 133-143, June.
    2. Li, Yu-Lin & Cui, Jian-Yuan & Zhang, Tong-Hui & Zhao, Ha-Lin, 2003. "Measurement of evapotranspiration of irrigated spring wheat and maize in a semi-arid region of north China," Agricultural Water Management, Elsevier, vol. 61(1), pages 1-12, June.
    3. Kang, Shaozhong & Gu, Binjie & Du, Taisheng & Zhang, Jianhua, 2003. "Crop coefficient and ratio of transpiration to evapotranspiration of winter wheat and maize in a semi-humid region," Agricultural Water Management, Elsevier, vol. 59(3), pages 239-254, April.
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