| Popis: |
Abstract Background In order to improve the current situations in rice–wheat rotation region in the middle and lower reaches of the Yangtze River, such as large amount of rice straw, complex returning process, short-time stubble connection, high power consumption, poor smoothness and especially unstable performance, and further promote the resource utilization process of full straw returning in Jiangsu province, this study, combined with the agronomic requirements of wheat sowing in rice-stubble land, developed an innovation of strip fertilization planting for straw crushing with back-throwing and interrow-laying in full stubble fields. Results Structural design and theoretical analysis were carried out on key components such as straw crushing device, broken-straw control device, soil rotary-tillage device and power transmission device, etc., to determine the corresponding structure and operating performance parameters, and then the field performance and verification tests were completed on the uniformity of inter-row mulching-straw Y 1 and the variability of seed-band width Y 2 . The results showed that the crushing spindle rotation-speed A had an extremely significant impact on Y 1 , followed by the machine ground speed B. The conveying impeller rotation-speed C had an extremely significant effect on Y 2 , also secondary to the machine ground speed B. And the superior combination of factor levels as A 2 B 2 C 2 was adopted through the comprehensive power energy consumption analysis. The verification test results indicated that under the optimized operation parameter combination, namely, when the crushing spindle rotation-speed A was 2100 r/min, the machine ground speed B was 0.8 m/s, and the conveying impeller rotation-speed C was 210 r/min, the mean value of inter-row straw uniformity Y 1 and seed-band width variation Y 2 were 90.85% and 10.73%, respectively, after machine operation. Conclusion It meets the requirements of operation quality and planting agronomy of relevant protective tillage machinery, and provides technical and equipment support for the research and development of similar straw crushing and no-tillage sowing. |
