Evaluation of physiological indices of winter wheat under different irrigation treatments using weighing lysimeter
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 24
Abstract
In order to evaluate physiological indices of winter wheat in different irrigation treatments in climatic condition of Beijing, an experiment was conducted in National Precision Agriculture Demonstration Station in Xiaotangshang Town of Beijing. Irrigation treatments were (I1) irrigation before sowing (60 L); (I2) Irrigation before sowing (30 L) + before freezing (30 L); (I3) irrigation before sowing (30 L) + before freezing (30 L) + at erecting stage (60 L) + flowering stage (60 L); (I4) Irrigation before sowing (30 L) + before freezing (30 L) + jointing stage (60 L) + flowering stage (60 L). The crop growth was low in the beginning of sampling, thereafter increased considerably up to 125 days after planting (22 g/m2/day) with a peak in 130 days after planting, then showed a declining trend after that. The decrease in crop growth rate towards maturity is due to senescence of leaves and decrease of leaf area index. The maximum and the minimum CGR was related to irrigation one and irrigation four, respectively. RGR decrease during plant growth and reached to a zero at 185-195 days after planting, and it reached into negative after these days until harvesting time. Moreover, the highest LAI was related to irrigation treatment number 2, and the lowest one was obtained for treatment number one. The NAR was low in the beginning of sampling, thereafter increased considerably up to 105 days after planting which was 8.6 g/m2/day. Then showed a declining trend after that toward zero (192 days after planting), then it has negative trend.
Authors and Affiliations
Mohamad Hesam Shahrajabian, Xuzhang Xue, Ali Soleymani, Peter Oko Ogbaji, Yuegao Hu
Keywords
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