Full
Outline
To address the issues of poor seedling establishment and uneven population growth in direct-?seeded rice in southern China, caused by rice seeds are sown on the soil surface after mechanized direct seeding and are subsequently affected by climatic and ecological conditions.
Based on the principle of simultaneous coverage of rice seeds with powdered organic materials, theoretical analysis of a cam-plate metering and application device was conducted. The key parameters of the cam, discharge rotor, material push plate, and discharge apparatus were determined, and a powdered organic material discharge apparatus was designed. Bench tests were carried out. A prototype rice direct seeder with simultaneous powdered organic material coverage was fabricated, and its field performance was validated through field experiments.
The results showed that for the powdered organic materials [organic fertilizer, seedling nursery substrate, nutrient soil A, and nutrient soil B (a 2:1 mixture of nutrient soil A and organic fertilizer)], the coefficient of variation for application rate was below 7.80% at rotational speeds of 33-118 r/min, indicating good application stability. Due to the characteristics of the materials, the coverage thickness gradually decreased with increasing rotational speed, but remained stable. When applying the seedling nursery substrate, the coefficient of variation for coverage thickness fluctuated within a relatively large range of 9.41%-18.67%. When applying organic fertilizer, nutrient soil A, and nutrient soil B, the coefficient of variation for coverage thickness was below 15% in all cases, meeting the agronomic requirements for simultaneous coverage of rice seeds with powdered organic materials. Regression equations for coverage thickness were established, all with fitting degrees exceeding 0.95. Field experiment results showed that for the rice varieties Zhongjiazao 17 and Wufengyou 286, the average emergence rates under the coverage treatment increased by 19.59% and 22.65%, respectively, compared with the non-covered treatment.
This apparatus improves the mechanized level of rice cultivation and provide a reference for the design of complete rice direct seeding machines with simultaneous powdered organic material coverage.
94
26
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
