4Howell T A, Musick J T, Tolk J A. Canopy temperature of irrigated winter wheat [J] .Trans of the ASAE, 1986,29:1692 - 1698,1706.
5Rashid A, Stark J C, Tanveer A, et al. Use of canopy temperature measurements as a screening tool for drought tolerance in spring wheat [J] .J Agron and Crop Sci, 1999,182(4) :231 - 237.
6Ayeneh A, Vanginkel M, Reynolds M P, et al. Comparison of leaf, spike, peduncle and canopy temperature depression in wheat under heat stress[J]. Field Crops Research,2002,79(2 - 3) : 173 - 184.
7Fischer R A, Rees D, Sayre K D, et al, Wheat yield progress associated with higher stomatal conductance and photosynthetic rate, and cooler canopies [ J]. Crop Sci, 1998,38 : 1467 - 1475.
8Petterson T G, Moss D V, Brum W A. Enzymatic changes during the senscene of filed-grown wheat [J]. Crop Sci, 1980,20:15.
