Abstract:

To investigate the effect of 0.02% iron dihydroporphyrin soluble powder on wheat in different ways and dosages, ‘Huaimai 139’ was used as the test material, 0.02% iron dihydroporphyrin soluble powder was applied at 22.5, 45, 67.5 and 90 g per hectare, and clear water was used as the control (CK). The optimum dosage range and application technique of 0.02% iron dihydroporphyrin soluble powder for wheat were investigated by seed dressing and foliar spraying at the nodulation stage and the beginning of ears, respectively. The results showed that compared with the CK, both seed dressing and foliar spraying at 45 g/hm² and 67.5 g/hm² could improve wheat yield, among which the highest yield was obtained at 67.5 g/hm² with 8.4% increase in seed dressing, and 6.89%, 7.8% and 1.8% increase in effective spike number, spike grain number and grain weight; foliar spraying at both the nodulation stage and the beginning of ears, the highest yields were obtained at the treatment of 67.5 g/hm², with 11.8% and 14.04% increase in yield and 10.15% increase in thousand grain weight at the beginning of the spike. This indicated that 45 g/hm² and 67.5 g/hm² 0.02% iron dihydroporphine soluble powder enhanced leaf photosynthetic capacity and grain filling capacity by increasing wheat plant biomass and chlorophyll content, and enhanced catalase (CAT), superoxide dismutase (SOD) and peroxidase (POD) activities to improve wheat stress tolerance and provide material conditions for yield formation. Therefore, different application methods with corresponding 0.02% iron dihydroporphyrin soluble powder dosage can effectively improve wheat yield, and the application rate of 67.5 g/hm² had the largest yield increase. Considering all indicators, the effect of foliar spraying is better than seed dressing.

Key words: 0.02% iron dihydroporphyrin soluble powder, wheat, application method, dosage