Structure and sowing principles of rice rope direct seeding machine are introduced. In order to test the machine＇ s working performance, such as compacting effect, sowing depth, influence of sowing device to rice rop...Structure and sowing principles of rice rope direct seeding machine are introduced. In order to test the machine＇ s working performance, such as compacting effect, sowing depth, influence of sowing device to rice rope, etc., field experiments were conducted. It is concluded that mean slip ratio of compacting wheel 1 is 4.44%, wheel 2 is 5.58%, wheel 3 is 7.81%, and wheel 4 is 6.96%; mean depth of planting is 29.72 mm, and mean variability coefficient of planting depth is 6.39%. Maximum variability coefficient of planting depth is 8.40%. Rice rope＇s snapping is closely related with the machine＇s speed and guide thread wheel by sowing device orthogonal experiments. Test results show that the machine has a rational design, safe work and meets to the requirements of planting. This study has laid the foundation for further studying the project.展开更多
Little is known about the impact of direct sowing under vegetation cover on the production and quality of New Rice for Africa （NERICA） on poor oxisol. In this study, two NERICA varieties （NERICA 3 and NERICA 8） w...Little is known about the impact of direct sowing under vegetation cover on the production and quality of New Rice for Africa （NERICA） on poor oxisol. In this study, two NERICA varieties （NERICA 3 and NERICA 8） were grown under tropical oxisol soil with very low nutrient contents. Four cultivation systems were used in completely randomized block design, including plowing （control）, unplowed soil with dead vegetation cover （DVC）, unplowed soil with live vegetation cover （LVC） and unplowed soil with mixed vegetation cover （MVC）. DVC significantly improved the exponential growth of NERICAs. NERICA 3 was the more productive （2.16–3.05 t/hm2） compared with NERICA 8 （0.71–1.21 t/hm2）. Cultivation systems improved the nutritional quality of NERICAs. The total protein content of NERICA 3 under DVC and MVC was 84.8% and 75.0% higher than control, respectively. The total soluble carbohydrate contents of NERICA 8 under LVC and MVC was 73.2% and 57.3% higher than control, respectively. These results suggested that conservative approach like direct sowing on unplowed soil with vegetation cover systems can improve the nutritional quality of rainfed NERICAs and their sustainable production under poor oxisol soil in sub-Saharan Africa.展开更多
采用田间小区试验法开展机械水直播稻田随播随用芽前除草剂防除杂草效果及其对水稻的安全性评价研究。结果表明:4%双唑草腈SC 1 500 m L∕hm^(2)对千金子、异型莎草、耳基水苋菜和陌生菜防除效果优异,10%嘧草醚WP 450 g∕hm^(2)对稗草...采用田间小区试验法开展机械水直播稻田随播随用芽前除草剂防除杂草效果及其对水稻的安全性评价研究。结果表明:4%双唑草腈SC 1 500 m L∕hm^(2)对千金子、异型莎草、耳基水苋菜和陌生菜防除效果优异,10%嘧草醚WP 450 g∕hm^(2)对稗草防除效果优异,两者混用能够有效扩大杀草谱,并可安全应用于机械水直播稻田。4%双唑草腈SC 1 500 m L∕hm^(2)+300 g∕L丙草胺EC 1 125 m L∕hm^(2)、4%双唑草腈SC 1 500 m L∕hm^(2)+10%嘧草醚WP 375 g∕hm^(2)于水稻机械直播后随播随用,对稗草、千金子、异型莎草、耳基水苋菜和陌生菜等稻田主要杂草的防效均可达96.7%—100%,且对水稻出苗率、株高和地上部鲜重均无不良影响,防除效果和安全性与常用对照药剂30%苄嘧·丙草胺OD 1 500 m L∕hm^(2)+专用安全剂375 m L∕hm^(2)无显著差异,生产上可进行交替使用。展开更多
基金supported by the National Natural Science Foundation of China(50775150)
文摘Structure and sowing principles of rice rope direct seeding machine are introduced. In order to test the machine＇ s working performance, such as compacting effect, sowing depth, influence of sowing device to rice rope, etc., field experiments were conducted. It is concluded that mean slip ratio of compacting wheel 1 is 4.44%, wheel 2 is 5.58%, wheel 3 is 7.81%, and wheel 4 is 6.96%; mean depth of planting is 29.72 mm, and mean variability coefficient of planting depth is 6.39%. Maximum variability coefficient of planting depth is 8.40%. Rice rope＇s snapping is closely related with the machine＇s speed and guide thread wheel by sowing device orthogonal experiments. Test results show that the machine has a rational design, safe work and meets to the requirements of planting. This study has laid the foundation for further studying the project.
基金Supported by the Subprogram " the Mechanization Development of High Speed Rice Sowing-Rice Direct Sowing Machine" of the Programs of Science Research for the "10th Five-year Plan" of MinistryScience and Technology (2001BA504B01-02)~~
基金the Laboratory of Biotechnology and Environment as well as the Food and Nutrition Research Center(CRAN)of Institute for Medical Research and Study of Medicinal Plants in Cameroon for their support
文摘Little is known about the impact of direct sowing under vegetation cover on the production and quality of New Rice for Africa （NERICA） on poor oxisol. In this study, two NERICA varieties （NERICA 3 and NERICA 8） were grown under tropical oxisol soil with very low nutrient contents. Four cultivation systems were used in completely randomized block design, including plowing （control）, unplowed soil with dead vegetation cover （DVC）, unplowed soil with live vegetation cover （LVC） and unplowed soil with mixed vegetation cover （MVC）. DVC significantly improved the exponential growth of NERICAs. NERICA 3 was the more productive （2.16–3.05 t/hm2） compared with NERICA 8 （0.71–1.21 t/hm2）. Cultivation systems improved the nutritional quality of NERICAs. The total protein content of NERICA 3 under DVC and MVC was 84.8% and 75.0% higher than control, respectively. The total soluble carbohydrate contents of NERICA 8 under LVC and MVC was 73.2% and 57.3% higher than control, respectively. These results suggested that conservative approach like direct sowing on unplowed soil with vegetation cover systems can improve the nutritional quality of rainfed NERICAs and their sustainable production under poor oxisol soil in sub-Saharan Africa.
文摘采用田间小区试验法开展机械水直播稻田随播随用芽前除草剂防除杂草效果及其对水稻的安全性评价研究。结果表明:4%双唑草腈SC 1 500 m L∕hm^(2)对千金子、异型莎草、耳基水苋菜和陌生菜防除效果优异,10%嘧草醚WP 450 g∕hm^(2)对稗草防除效果优异,两者混用能够有效扩大杀草谱,并可安全应用于机械水直播稻田。4%双唑草腈SC 1 500 m L∕hm^(2)+300 g∕L丙草胺EC 1 125 m L∕hm^(2)、4%双唑草腈SC 1 500 m L∕hm^(2)+10%嘧草醚WP 375 g∕hm^(2)于水稻机械直播后随播随用,对稗草、千金子、异型莎草、耳基水苋菜和陌生菜等稻田主要杂草的防效均可达96.7%—100%,且对水稻出苗率、株高和地上部鲜重均无不良影响,防除效果和安全性与常用对照药剂30%苄嘧·丙草胺OD 1 500 m L∕hm^(2)+专用安全剂375 m L∕hm^(2)无显著差异,生产上可进行交替使用。
