Investigating the relationship between water stress index (CWSI) and yield of maize in Qazvin region
Subject Areas : Irrigation and drainage
1 - Dept of Water Engineering, Faculty of Agriculture and Natural Resources, Imam Khomeini International University, Qazvin, Iran.
Keywords: Water stress, Leaf surface temperature, Maize growth stages, Stomatal resistance,
Abstract :
In order to scheduling the irrigation time and estimation the crop yield with CWSI index, a research was done on maize (S.C. 704). The experiment was performed as factorial in a randomized complete block design. Treatments were included the water stress in growth stages of 6-leaf, 12-leaf, flowering, seeds doughing and a control treatment with full irrigation. At the threshold of water stress, CWSI index values for the above growth stages were estimated to be 0.37, 0.54, 0.63 and 0.47, respectively. Therefore, irrigation time was recommended when the CWSI index reached to the above values. Maize biomass yield in control and stress treatments at growth stages of 6-leaf, 12-leaf, flowering and seeds doughing, was measured equal to 60.1, 55.5, 48.2, 45.1 and 50 (t.ha-1), respectively. The results showed there was a relationship of Y(ton.ha-1)=-25.603CWSI+62.049 between the CWSI index and maize yield. Therefore, crop yield was estimated by the amount of CWSI index.
_||_
