| In order to investigate the characteristics of growth and photosynthetic parameters of winter wheat Aikang
-58, a field trial was carried out to study the effet of water retaining agent (0, 30, 60, 90 kg/hm2) on soil moisture, height，leaf area, leaf water potential and photosynthetic characteristics. The results indicated that moisture increased not only in top soil, but also in 20 cm deep soil after application of water retaining agent. At jointing stage, the leaf relative water content increased with the addition of water retaining ragent. While with the advance of growth stage，leaf relative water content decreased, but significantly higher than the CK. Plant height of wheat with 30 kg/hm2 of water retaining a gent was the highest, while the leaf area of wheat with 60 kg/ hm2 of water retaining agent at different growth stages was higher than other treatments . What s more, in the growth period, the photosynthetic rate of winter wheat showed: 30 kg/hm2>90 kg/ hm2>60 kg/hm2> CK(P<0.05),while transpiration rate showed: CK，30 kg/hm2 >60 kg/hm290 kg/hm2，and the water use eficiency of wheat with 90 kg/hm2 of water retaining agent was increased significantly com-
pared with other treatments. However, the biomass and yield of wheat with 60 kg/hm2 of water retaining agent was the highest. |