Design Of Variable Rate Irrigating Hill-seeder

The area of our contry’s northern arid and semi-arid regions of north of Qinling Mountains, Kunlun Mountains and Huaihe River is half percentage of our contry’s total area. The agricultural acreage of this region is about forty percentage of our contry’s total agricultural acreage.But it is exterm lack of water resource in this area which maks only twenty percentage of our contry’s total water resource. And the rainfall capacity of this area is very different between years and years or seasons and seasons which always lead to droughts.It is problem which demands to solve as soon as possible to develop technology and equipment of drought resistance and water saving.It is very effective to use irrigating hill-seeding to solve the problem of can’t sow and no plants after sowing due to droughts. But we can not achieve the best effect by the same irrigating water amount. For the problem of variable rate irrigating, lot’s of universities and research institutes have carried out the related research for variable equipment and technology for water sowing. The variable equipment and technology played a role to some extent in water saving, drought resistance and production increasing.But they have common in structure of using mechanical device to make variable rate and irrigating and seeding to the same hill and generally using manual way to control water amount.And it is entirely using hardware to improve the irrigating property. It also have flaws, for example there’s little freedom degrees for contrying of irrigating water amount and it is very complex to contry irrigating water amount. Also, intelligent variable irrigation machinery developed by the European and American countries entirely use continuous irrigating and make variable irrigating by controling the flow valve’s opening degree through micro controller. We have nont checked out research content related to intermittent variable irrigating.In order to solve this problem, our team personnel have developed corn irrigating hill-seeder based on GPS and GIS. Under working conditions, it is using manual way to make acquisition of farmland soil moisture information and location information before the machine working. Then make these informations into decision files through GIS. Controyer obtains information by GPS and reads decision files at the same time when machine working.As a result, we can make acquisition of irrigating water amount.In order to complete irrigating hill-seeding, we can controy the irrigating when the falling seed signal is detected by the sensor. The field experiment results shows that it has good water saving effect compared with strip irrigating and quantitative irrigating of the machine itself when the machine prototype use variable saving effect compared with strip irrigating and quantitative irrigating of the machine itself when the machine prototype use variable irrigating.And economic and ecological effect is significant. But there are two problems with making application of this machine.First, field soil moisture content’s variable ratio of time and space is obvious.And the machine could not collect information change irrigating water amount timely. So it can’t reach the optimal water saving effect. Secondly, we need to make acquisition of farmland soil moisture information and location information before the machine working, and the amount of work is very big. Lastly,we should install the system of GPS and GIS.And it needs the help of PC software of decision system for irrigating pattern. So it not only improves the equipment operation cost, but also it puts forward higher cultural science and technology level requirements for user.On this basis, this topic make further research on the fusion technology of variable rate irrigating hill-seeding based on sensor on the basis of previous research results and developed the variable rate irrigating hill-seeder.I designed the moisture test system in this subject.And the sensor of this system could make acquisition of soil moisture content of farmland timely. Then I designed the synchronous control system of water and seeds.And controying system of irrigating could change irrigating water amount by soil moisture content of farmland, achieving the target of irrigating by needs and achieving the optimal effect of water saving.Then I made study of the mathematical model for solenoid valve irrigating water amount, and provided references for optimization design of decision system for irrigating pattern of variable rate irrigating hill-seeder. I carried out the relevant experimental study at the same time.And the results show that the the moisture test system could detecte soil moisture content stably and reliably, the system’s absolute error of measured values and approximate real value is only0.22, with high detection accuracy and stability. And the detection rate of detection module for falling seeds is above98%,with high detection rate which laid the foundation for synchronization of water and seeds. And the correlation coefficient of mathematical model data and experiment data is above99%, verification results show that the mathematical model for solenoid valve irrigating water amount is accurate which can be used as a reference for further optimizing the water decision module.