the present invention , both as to its organization and manner of operation , may best be understood by reference to the following description and the drawings wherein numbers are used throughout several views to label like parts . certain parts which are mentioned may be absent in particular figures due to the view of the drawing or obstruction by other parts . a preferred embodiment of a sectional meter shut - off device / assembly 35 of the present invention is illustrated in fig1 to 8 . the sectional meter shut - off device is comprised of a fluted or toothed metering roller 1 for ultimate distribution of particulate material to an agricultural implement . the metering roller 1 extends across the width of a metering assembly 35 . the metering roller 1 can be made of a variety of materials and have a variety of fluted or toothed configurations to correspond to the various crops that may need seeding . upon forward movement of an air seeding system 100 the metering roller 1 rotates on a drive shaft 2 which causes particulate material including seed and fertilizer to be dispensed from a supply source 5 having a seed tank 96 and a fertilizer tank 98 to dispense at a predetermined rate through outlets 27 in the fertilizer metering assembly 35 a or seed metering assembly 35 b and into distribution lines 37 ( see fig8 ) and ultimately dispensed by an air distribution system 15 , 18 through a plurality of ground - engaging openers 3 ( fig1 to 16 ) and into soil . fig1 - 7 illustrate outlets 27 . in a field where a pie shape or long strips of land remain unseeded or unfertilized and / or are narrower than the width of the seeding / fertilizing machinery , it would be optimal to turn off part of the seeding / fertilizing machinery to only seed / fertilize those areas that have not been seeded / fertilized rather than over - seed / fertilize or double - seed / fertilize a particular area and disturb an underlying seed bed . to accomplish this , a plurality of gates 4 are installed above the metering roller 1 which are able to move in either forward or rearward directions . in the forward direction each gate 4 prevents particulate material from being dispensed to that particular section of the metering roller 1 and acts as a barrier preventing the particulate material from contacting the metering roller 1 . in the rearward position the gate 4 allows the particulate material to access the metering roller 1 . a plurality of these gates 4 occur along the axis 33 of the metering roller 1 such that the metering roller 1 can be divided into sections and individual gates 4 can be engaged to provide a different length of the air seeding system to be blocked for seeding or fertilizing purposes . as seen in fig2 and 4 , a gate 4 is threadably connected to a first end of a shaft 7 above the metering roller 1 . the shaft 7 is slidably attached to the internal surface of the rear and upper corner of an air seeding system hopper 5 . further , a second end of the shaft 7 is attached to an electric actuator , a hydraulic cylinder actuator , or an electric over hydraulic meter gate actuator 80 . further , each gate 4 is slidably connected to a metal plate 26 , the plate 26 being connected to the upper , rear portion of an air seeding system hopper 5 by a variety of means which may include but are not limited to welded , soldered or bolted . the metal plate 26 serves as a guide for the gate 4 such that the plate &# 39 ; s position relative to the gate 4 correctly positions the gate 4 over the metering roller 1 when engaged by the shaft 7 . further , when engaged by the shaft 7 , the gate 4 is brought forward to engage the opposite end of the air seeding system hopper 5 such that particulate material cannot pass between the gate and the air seeding system hopper 5 . when not engaged by the shaft 7 , the gate 4 remains in a fixed position slidably attached to the metal plate 26 . in this position , particulates can pass between the gate 4 and the air seeding system hopper 5 and through to the metering roller 1 and then to distribution lines 37 . from the distribution lines 37 , the particulate material will ultimately pass to the ground - engaging openers 3 of an agricultural implement / air seeding apparatus 200 and into the soil . fig5 to 7 show the shaft 7 differently engaged to produce an open gate 22 or a closed gate 23 when activated . each gate 4 is ideally made of steel or another suitably strong metal . when in the forward ( closed ) position , the gate 23 completely prevents the metering roller 1 from accessing any particulate matter released from above the metering roller 1 . in fig2 the gate 4 can be clearly seen in its closed position 23 blocking all access of the particulate material to the metering roller 1 . in fig4 and fig6 the opened gates 22 can best be seen in which a free flow of particulate matter to the metering roller 1 can occur . an electric switch 101 in the cab of the vehicle ( not shown ) pulling the air seeding apparatus 200 is connected operatively to an electric actuator , hydraulic actuator or electric over hydraulic actuator 80 which is operatively connected to the second end of the shaft 7 to allow the operator to operate the sectional meter shut - off apparatus 35 and more specifically designate which gates 4 are to be open and which gates 4 are to be closed based on the operators knowledge of which soil is to be seeded / fertilized and which is to remain undisturbed . fig1 shows a schematic of the electrical circuit 120 for operating the air seeding apparatus 200 of the present invention , which includes a plurality of switches 101 , for operating corresponding electrical coils 102 which respectively operate corresponding hydraulic valves 202 to control hydraulic cylinder actuator 80 and thus gates 4 on meter shut - off device 35 ( see fig1 ), and such switches 101 further operate coils 104 , which correspondingly control hydraulic valves 112 for controlling hydraulic cylinders 12 for raising and lowering respective opener arm assemblies 202 from engagement with soil . fig1 is an electrical schematic similar to fig1 , both figures showing an electrical circuit 120 for operating air seeding apparatus 200 of the present invention , which includes a plurality of switches 101 for operating corresponding electrical coils 102 . electrical coils 102 respectively operate corresponding hydraulic valves 111 to control gates 4 on meter shut - off device 35 ( see fig1 & amp ; 20 ). switches 101 of fig1 & amp ; 18 further and simultaneously operate coils 104 which correspondingly control hydraulic valves 112 for controlling hydraulic cylinders 12 for raising and lowering respective opener arm assemblies 202 from engagement with soil . in this regard , fig2 shows shank hydraulic cylinders 12 for groups of opener arm assemblies 202 ( see “ towers ” 1 a & amp ; 1 b ) in actuated position so as to cause associated opener assemblies 202 to be in the raised position . remaining hydraulic cylinders 12 for remaining shank towers 2 a , 3 a , 4 a , 5 a , 6 a , 7 a & amp ; 8 a , and 2 b , 3 b , 4 b , 5 b , 6 b , 7 b , and 8 b are shown in the position to effect lowering of associated opener arm assemblies 202 . in the electrical circuit 120 shown in fig1 , all switches 101 ( eg . sw 1 - 4 ) are shown in the “ off ” position . this causes associated hydraulic valves 112 to open and thereby cause corresponding hydraulic actuators 80 which control the metering gates 4 of the meter shut - off devices 35 a , 35 b to actuate the gates 4 to be in the “ closed ” position , and correspondingly control hydraulic valves 112 to cause hydraulic cylinders 12 to lower the opener arm assemblies 202 to engage soil ( see fig1 , and fig1 ). in the electrical circuit 120 shown in fig1 , sw 1 is shown in the “ on ” position and the remaining switches sw 2 - 4 are shown in the “ off ” position . as seen from fig1 and 20 , due to sw 1 being in the “ on ” position , corresponding coil 102 ( coil 1 a ) activates meter shut - off valve 111 which correspondingly activates meter gate hydraulic actuator 80 , so as to close meter gate 4 . simultaneously , switch 101 ( sw ) activates coil 108 ( coil 1 b ), so as to activate hydraulic valves 112 ( see fig2 ) ( valve 1 b ), which in turn operates hydraulic shank cylinders 12 for opener arm assembly 202 ( shank cylinders 1 a , 1 b ), so as to cause hydraulic shank cylinders 12 to raise opener arm assembly 202 to the raised position , as shown in fig1 and in position 91 on fig1 . fig8 to 12 shows an agricultural apparatus equipped with a seed meter 35 a and a fertilizer meter 35 b . from each meter 35 a , 35 b , a plurality of distribution lines 37 are coupled such that an individual gate 4 within a meter 35 a , 35 b will correspond to an individual distribution line 37 . each distribution line is also coupled at its other end to a secondary distribution head 74 . each agricultural apparatus 200 has a plurality of secondary distribution heads 74 . each secondary distribution head 74 has a plurality of couplings to seed hoses 82 or fertilizer hoses 84 . each secondary distribution head 74 is then coupled at its other end to respective seed tube / hose 18 and fertilizer hose / tube 15 ( see fig9 ). because the secondary distribution head 74 has a plurality of couplings to seed tube / hoses 18 or fertilizer tube / hoses 15 , each gate 4 of meter shut - off 35 a , b can selectively open or close the supply of seed or fertilizer to a respective plurality of seed hoses 18 ( in the case of a seed meter shut - off device 35 a ) and to a plurality of fertilizer tube / hoses 15 ( in the case of a fertilizer meter shut - off 35 b ). in fig9 all of the distribution lines ( white ) depict seed and fertilizer hoses 82 , 84 respectively open to the flow of fertilizer by a plurality of gates 4 in the seed meter 35 a , and fertilizer meter 35 b , respectively . accordingly , in fig1 , all of the agricultural implements 200 are in the lowered position to allow the soil to be fertilized . the black distribution lines in fig1 depict seed hoses 82 and fertilizer hoses 84 shut - off to the flow of fertilizer by a plurality of gates 4 in the respective meter 35 a , b , and the white distribution lines depict seed hoses 82 and fertilizer hoses 84 open to the flow of seed and fertilizer by a plurality of gates 4 in the respective seed and fertilizer meters 35 a , b . as such , a plurality of opener arm assemblies 202 will have seed and fertilizer distributed to them and a plurality of opener arm assemblies 202 will not have fertilizer or seed distributed to them . fig1 depicts a group of opener arm assemblies 202 in the raised position 91 so that they do not disturb the soil . fertilizer hoses 84 and associated fertilizer tubes / hoses 15 , and likewise seed hoses 82 and corresponding seed hoses / tubes 18 , all associated with the opener arm assemblies 202 which are in the raised position 91 , are closed to the flow of seed / fertilizer . other opener arm assemblies 202 are shown in the lowered position 93 , and the associated fertilizer tubes / hoses 15 and seed tube / hoses 18 are provided with fertilizer and seed to permit operation of the remaining operable opener arm assemblies 202 shown in lowered position 93 . further , in another embodiment a gps ( global positioning system ) or gnss ( global navigation satellite system ) guided system ( not shown ) is employed to automatically engage the electric actuator , hydraulic actuator , or electric over hydraulic cylinder actuator 80 and shaft 7 to close or open the gates 4 into an open or closed position , based on previous data determining where the seed or fertilizer has been previously deposited in the soil , to ensure that double seeding / fertilizing or over seeding / fertilizer does not occur . in a preferred but non - limiting embodiment , as seen in fig1 to 16 an agricultural implement 200 consists of an opener arm 11 pivotally mounted at pivot joint 6 to a cross - member 9 which is fixedly mounted to a conventional frame 92 . the conventional frame 92 is operatively connected to a plurality of ground - engaging wheels 94 . the opener arm mounting bracket 10 is fixedly mounted via cross - member 9 to conventional frame 92 . hydraulically extendable arm 45 , containing a biasing hydraulic ram 12 , is pivotably coupled at one end 8 thereof to opener arm mounting bracket 10 , at another end 20 to seed opener arm 31 , such that the biasing hydraulic ram 12 rests substantially parallel and below the opener arm 11 , as shown in fig1 . first mounting member 31 is pivotably connected to opener arm 11 at pivotal joint 21 , such that mounting member 31 is below and roughly perpendicular in the operating ( soil engaging ) position to opener arm 11 . hydraulic ram 12 may be extended to cause mounting member 31 to pivot rearwardly , and upon being so pivoted to contact opener arm 11 , to cause opener arm 11 to pivot about pivot joint 6 so as to become raised , thereby raising the opener arm 11 , packer wheel 19 , first mounting member 31 ( hereinafter collectively the opener arm assembly 202 ) from engagement with the ground . first mounting bracket 31 is fixedly connected to the first delivery system mounting member 13 . the first delivery system mounting member 13 contains the first cutting knife 14 as well as the first product ( eg fertilizer ) delivery hose / tube 15 ( usually for delivering fertilizer ) behind the first cutting knife 14 . distal to the first delivery system mounting member 13 is a second delivery system mounting member 16 connected below and to a second mounting member 32 . the second mounting member 32 is fixedly connected at point 24 to a mounting arm extension 29 . a pin 33 and plurality of bolts 34 also adjustably connects the second mounting member 32 to opener arm 11 . the pin and plurality of holes allow for vertical adjustment of the second delivery system mounting member 16 . the second delivery system mounting member 16 is generally perpendicular to opener arm 11 . the mounting arm extension 29 is rigidly connected to the opener arm 11 with two fixed bolts 30 . the second delivery system contains a second cutting knife 17 as well as a second product ( eg seed ) delivery tube / hose 18 ( usually for delivering seed ) behind the second cutting knife 17 . both first and second delivery system members 13 , 16 respectively , are collectively referred to as ground - engaging openers 3 . a linked chain 25 connects the first and second ground - engaging openers 3 and limits the forward movement of the first ground - engaging opener . a ground - engaging packer wheel 19 is connected to the distal end of the second mounting bracket 32 . the packer wheel 19 follows the two delivery system mounting members 13 , 16 and allows for packing of soil above the material which has been inserted in furrows created in the soil . the biasing hydraulic ram 12 is pivotally connected to both the frame mounting member 10 as well as the first mounting bracket 31 to be able to engage the first delivery system mounting member 13 . when the hydraulic ram 12 is extended , the upper edge of the first delivery system mounting member 13 engages the front edge 28 of the mounting arm extension 29 . the mounting arm extension 29 is then raised , thus raising the attached second delivery system mounting member 16 , second pivot bracket 32 and packer wheel 19 . the front edge 28 of the mounting arm extension 29 is sufficiently thick to support the weight of the second delivery system mounting member 16 as well as the second pivot bracket 32 and wheel 19 in a raised position for transport purposes . reversing the hydraulic ram 12 by activating hydraulic shank valves 212 causes the corresponding opener arm assembly 202 to be lowered . fig1 and 16 illustrates the agricultural implement 200 having the opener arm assemblies 202 in the raised position for transport . this allows for the agricultural implement 200 to be driven over a field that has been previously seeded without disturbing the seed bed . the biasing hydraulic ram 12 is controlled by a plurality of electric and / or hydraulic valves 112 ( see fig9 & amp ; 20 ). this allows the operator to selectively raise either a single or multiple opener arm assemblies 202 from the cab of the vehicle . the agricultural implement 200 of the present invention is also contemplated as being configured such that it comprises only a plurality of single ground - engaging openers 3 and corresponding product delivery hose / tubes 18 and cutting knives 17 such that the agricultural implement 200 only delivers seed or fertilizer . in another important preferred refinement of the present invention , a gps (“ global positioning system ) or gnss ( global navigate satellite system ) control system ( not shown ) is provided to automatically control the opening and closing of the gates 4 of the meter shut - off devices 35 a , 35 b , as well as the raising and lowering of the opener arm assemblies 202 for the agricultural implement 200 of the present invention . specifically , such gps control system allows automatic control of not only coils 102 for controlling the meter valves 111 which in turn actuate / control hydraulic cylinder actuators 80 and thus associated gates 4 on meter shut - off devices 35 a , 35 b , but as well controls coils 104 for shank hydraulic valves 112 , which in turn control the biasing hydraulic rams 12 on the opener arm assemblies 202 to raise selected opener arm assemblies 202 for areas that are mapped using the gps system and known to already have be seeded , to thus prevent disturbing an already - planted seed bed . ( see fig1 and fig2 herein ). in this regard , at least one gps control system of the prior art may be specially adapted for the purpose of the present invention , namely the autospray ™ 7500 model controller manufactured by rinex corporation of south perth , western australia ( www . rinex . com . au / autospray . com ). specifically , the autospray ™ 7500 model controller and associated gps receiver has been used in the prior art for controlling spray nozzles of agricultural sprayers ( such as that depicted in u . s . pat . no . 6 , 053 , 019 manufactured by case corporation ( now case / new holland ), used to apply herbicide or liquid fertilizer to crops . in the manner that a gps receiver of the prior art has been used to provide data and input to the prior art autospray 7500 model controller , which in turn de - activates spray nozzles 22 located on a booms 28 , 30 of the device as shown in u . s . pat . no . 6 , 053 , 019 , where the gps controller determines that portions of the crop have already been sprayed and activates solenoids to control ( eg close ) spray nozzles on booms 28 , 30 to avoid “ double - application ” of herbicide , a gps receiver and gps controller such as the autospray 7500 model controller may by used for the purposes of the present invention to control coils 102 which in turn control associated hydraulic cylinder actuators 111 which in turn control individual gates 4 on meter shut - off devices 35 a , 35 b , as well simultaneously control coils 104 is used to control hydraulic valves 112 and thereby control / actuate hydraulic ram cylinders 12 to effect appropriate raising of opener arm assemblies 202 when desired . it should be recognized that while preferred embodiments of the present invention have been described , those skilled in the art will recognize a wide variation of structural and operational details without departing from the principals of the invention . accordingly , for a full definition of the invention , reference is to be had to the claim
an agricultural seeder or fertilizer having a meter device which dispenses seed or fertilizer to a plurality of ground - engaging members . the supply of metered seed or fertilizer to each of the ground - engaging members is controlled via input from a gps / gnss satellite navigation system to prevent the meter device delivering seed or fertilizer to selected of the ground - engaging members which would otherwise pass over soil which has been previously seeded or fertilized . raising means , responsive to input from said gps / gnss satellite navigation system detecting that the device is travelling or is about to travel over areas of soil that has been previously seeded or fertilized , is further is provided to raise the selected ground - engaging members to which delivery of seed / fertilizer has been prevented in order to prevent soil which has been previously seeded or fertilized from being disturbed . a method of operating a seeder / fertilizer implement to achieve the aforesaid is further disclosed .