Precision planters are more and more widely used for planting corn in China.Seed meters of conventional precision corn planters are usually driven by ground wheel and chain and sprocket system at present.Because of th...Precision planters are more and more widely used for planting corn in China.Seed meters of conventional precision corn planters are usually driven by ground wheel and chain and sprocket system at present.Because of the slippage of ground wheels and vibration of chains,planting accuracy cannot be ensured,especially at higher forward speed.To improve the planting performance of precision planters,a mechatronic driving system was designed and its field working performance was evaluated in this research.A two-row pneumatic precision planter was modified to allow simultaneously using two different driving systems,i.e,with one row unit equipped with the newly designed mechatronic driving system and the other row unit equipped with conventional mechanical driving system,and used for planting at three forward speeds(9,11 and 12 km/h)on no-tillage and rotary-tillage lands.The distances between adjacent seeds in each plot were measured and the indices of uniformity in seed spacing,quality of feeding index(QFI),missing-seeding index and precision index were analyzed.With the average 4.70%increase of QFI and 3.54%decrease of missing-seeding index,the mechatronic driving system performed better than the mechanical driving system both on no-tillage and rotary-tillage lands at each forward speed.The values of QFI,missing-seeding index and precision index of the mechatronic driving system on rotary-tillage land are comparable to those on no-tillage land,by contrast,these indices of the mechanical driving system on rotary-tillage land are significantly worse than those on no-tillage land.The result indicates that the mechatronic driving system can eliminate the effect of ground wheel slippage on planting quality and maintain the uniformity of seed distribution.Although the QFI,missing-seeding index and precision index become worse with the increase of forward speed,with the worst values of QFI of 89.93%,missing-seeding index of 5.08%and precision index of 18.92%at the highest forward speed of 12 km/h,the mechatronic driving syste展开更多
Maize is the most important crop for food and widely used for industrial materials,leading to its increasing demand all over the world.Precision planting is the effective method to increase maize yield.To meet the agr...Maize is the most important crop for food and widely used for industrial materials,leading to its increasing demand all over the world.Precision planting is the effective method to increase maize yield.To meet the agronomic requirement of precision planting,different kinds of precision maize planters were developed.However,because of the difference of geographical environment,cropping system,farm scale and economic status among different countries,types of maize planters are various and the technologies involved are at different levels.This paper summarizes the precision maize planters currently available in the world and classifies them into four types:precision planters for tilled-land,minimum/no tilled-land,hilly&small land,and cold&arid land.Detailed characteristics have been provided for some typical precision planters and comparisons were made as to their suitability under particular working conditions.High-efficiency and high-accuracy are the main features of precision planters for tilled-land,while the ability to clean residue from seed rows and prevent planters to be blocked are the important function of precision planters for minimum/no tilled-land.To fit for hilly&small land,planters should be light-weighted and small-sized,and to warm up soil and keep moisture,planters for cold&arid land should be equipped with plastic-film mulching mechanism.Finally,developing trend of precision planting technology was analyzed and suggestions,including policy support and technical improvement,were made for developing countries to make suitable precision maize planters according to the local geographical conditions and cropping systems.展开更多
基金This study was supported by the 948 Program(2014-S8)the National Science and Technology Research Program(2013BAD08B01-3)。
文摘Precision planters are more and more widely used for planting corn in China.Seed meters of conventional precision corn planters are usually driven by ground wheel and chain and sprocket system at present.Because of the slippage of ground wheels and vibration of chains,planting accuracy cannot be ensured,especially at higher forward speed.To improve the planting performance of precision planters,a mechatronic driving system was designed and its field working performance was evaluated in this research.A two-row pneumatic precision planter was modified to allow simultaneously using two different driving systems,i.e,with one row unit equipped with the newly designed mechatronic driving system and the other row unit equipped with conventional mechanical driving system,and used for planting at three forward speeds(9,11 and 12 km/h)on no-tillage and rotary-tillage lands.The distances between adjacent seeds in each plot were measured and the indices of uniformity in seed spacing,quality of feeding index(QFI),missing-seeding index and precision index were analyzed.With the average 4.70%increase of QFI and 3.54%decrease of missing-seeding index,the mechatronic driving system performed better than the mechanical driving system both on no-tillage and rotary-tillage lands at each forward speed.The values of QFI,missing-seeding index and precision index of the mechatronic driving system on rotary-tillage land are comparable to those on no-tillage land,by contrast,these indices of the mechanical driving system on rotary-tillage land are significantly worse than those on no-tillage land.The result indicates that the mechatronic driving system can eliminate the effect of ground wheel slippage on planting quality and maintain the uniformity of seed distribution.Although the QFI,missing-seeding index and precision index become worse with the increase of forward speed,with the worst values of QFI of 89.93%,missing-seeding index of 5.08%and precision index of 18.92%at the highest forward speed of 12 km/h,the mechatronic driving syste
基金This study was supported by the National Industry System of Corn Technology(CARS-02)the Soil-Machine-Plant key laboratory of Ministry of Agriculture of China.
文摘Maize is the most important crop for food and widely used for industrial materials,leading to its increasing demand all over the world.Precision planting is the effective method to increase maize yield.To meet the agronomic requirement of precision planting,different kinds of precision maize planters were developed.However,because of the difference of geographical environment,cropping system,farm scale and economic status among different countries,types of maize planters are various and the technologies involved are at different levels.This paper summarizes the precision maize planters currently available in the world and classifies them into four types:precision planters for tilled-land,minimum/no tilled-land,hilly&small land,and cold&arid land.Detailed characteristics have been provided for some typical precision planters and comparisons were made as to their suitability under particular working conditions.High-efficiency and high-accuracy are the main features of precision planters for tilled-land,while the ability to clean residue from seed rows and prevent planters to be blocked are the important function of precision planters for minimum/no tilled-land.To fit for hilly&small land,planters should be light-weighted and small-sized,and to warm up soil and keep moisture,planters for cold&arid land should be equipped with plastic-film mulching mechanism.Finally,developing trend of precision planting technology was analyzed and suggestions,including policy support and technical improvement,were made for developing countries to make suitable precision maize planters according to the local geographical conditions and cropping systems.
