Abstract:

To explore the application dosage and growth-promoting effect of the new fast straw return to field rot-promoting fungicide on the wheat straw return in rice field, a related field experiment was carried out. On the basis of conventional fertilization and wheat straw crushing and returning to field, 4 gradients of application dosage were set up: M1 (CK), M2 (30 kg/hm²), M3 (75 kg/hm²) and M4 (120 kg/hm²), and the effect of different application dosages on rice yield factors and rice yield was studied. The results showed that the application of the new fast straw returning fungicide not only promoted the degradation of straw, but also had a significant impact on the number of ears, grains per hectare and yield of rice. Compared with the control group M1, the M3 (75 kg/hm²) group had the best yield promotion effect, and the number of ears per hectare was 4.6635 million, increased by 16.09%; the number of grains per hectare was 86.03, increased by 12.12%. In terms of actual yield, the yield of M3 group was 7510.35 kg/hm², which was 12.94% higher than that of the control. The physical and chemical properties of soil showed that the decay promoter significantly increased the content of alkaline hydrolyzable nitrogen, available phosphorus, and available potassium in soil, which was increased by 93.33%, 18.13% and 46.93%, respectively, compared with the control group. In conclusion, this study evaluated the effects of applying different dosages of new fast straw-returning fungicide on the degradation of wheat straw in rice field and on rice yield, and lays a foundation for future research.

Key words: Wheat Straw Returning to Field, Saprophytic Agent, Rice, Yield Factors, Soil Physical and Chemical Properties