with further reference to the drawings , the wick applicator of the present invention is shown therein and indicated generally by the numeral 10 . wick applicator 10 comprises an elongated tube 12 that is constructed of pvc piping or other suitable material . tube 12 can be of various sizes but is contemplated for general applications that a three - inch diameter pvc pipe would be appropriate . formed within the tube 12 is a liquid holding chamber 12 a ( fig2 ). as will be appreciated from subsequent portions of this disclosure , holding chamber 12 a is adapted to receive and hold a liquid chemical to be applied by the wick applicator 10 . formed on the ends of the wick applicator 10 is a pair of clear end caps 14 . the end caps 14 are clear so as to enable the operator to view the internal chamber 12 a and determine the quantity of liquid contained therein at any time . formed along the bottom portion of the tube 12 is a series of outlet openings 16 . note that in fig2 where the outlet openings 16 are directed out the lower side of the tube 12 , approximately between the five and six o &# 39 ; clock position as viewed in fig2 . note also that in the embodiment illustrated herein , that there are two sets of the outlet openings 16 . each set of openings is designed , in the case of this disclosure , to accommodate a single row of a particular row crop . thus , as viewed in fig1 since there are two sets of outlet openings 16 , the wick applicator 10 illustrated therein is adapted and designed to accommodate the simultaneous treatment of two rows of crop . outlet openings 16 can vary in size and in spacing between the respective openings . it is contemplated that for general applications that the outlet openings would be approximately ⅛ to ⅜ inch in diameter and would be spaced approximately 1½ to 2 inches apart . secured around the elongated tube 12 adjacent the respected sets of outlet openings 16 is a wicking material 18 . note that the wicking material 18 is wrapped and secured around the tube 12 in such a fashion that the wicking material covers and extends around the area of the tube occupied by the outlet openings 16 . various wicking materials are known and are conventionally used on wick applicators . in the case of the present disclosure , it is contemplated that a relatively heavy denim fabric , of the upholstery type , would be suitable for a direct crop wick application as discussed subsequently in this disclosure . as illustrated in fig2 the wicking material 18 disclosed herein is of a 2 - ply construction because the wick applicator 10 disclosed herein is designed for a row crop application , the width of the wicking material 18 on the tube 12 should be of a sufficient span to effectively treat a single row . while the span of the wicking material 18 can vary to accommodate certain conditions and row spacings , it is contemplated that a span of 20 to 22 inches would be suitable in general applications . with reference to fig1 it is seen that there is a t - coupler 20 secured to one end of the elongated tube 12 . t - coupler 20 includes a threaded opening formed in what is referred to as the top of the coupler 20 or the top of the wick applicator 10 . secured within the threaded opening of the t - coupler 20 is a threaded cap 22 . threaded cap 22 also includes a smaller threaded opening therein . secured within the smaller threaded opening of the cap 22 and extending therefrom is an air inlet line indicated generally by the numeral 24 . air inlet line 24 includes a threaded coupler 26 that is adapted to be threadly connected within the opening formed in the cap 22 . secured to the threaded coupler 26 is a main on / off valve 28 . main on / off valve 28 includes a actuating handle 28 a that can be turned or rotated to open and close - the main on / off valve 28 . secured to the main on / off valve 28 and extending therefrom is an elbow 30 . connected to the elbow 30 is a reducer 32 that includes a threaded end 32 a . an orifice plate retainer 34 that includes internal threads is designed to be secured to the threaded end 32 a of the reducer 32 . orifice plate retainer 34 is designed to accept and hold an orifice plate 36 . in particular , orifice plate 36 is sized to fit within the retainer 34 and the retainer 34 is in turn adapted to hold and secure the orifice plate 36 between the terminal end of the threaded end 32 a of the reducer 32 and the retainer 34 . formed in the orifice plate 36 is a non - variable fixed size orifice 38 . the orifice diameter can vary depending upon the type of application that the wick applicator is set up to accommodate . generally however , it is contemplated that in most field applications that the orifice diameter would range in size from approximately 0 . 020 to 0 . 150 inches in diameter . more particularly , one is referred to the various orifice plates manufactured by spraying systems co ., of wheaton , ill . spraying systems co ., manufactures an orifice plate , no . 49 / 6 - 35 that is appropriate in a number of typical agricultural crop applications . the purpose of the orifice 38 is to control the rate of application of the wick applicator 10 . essentially , the orifice 38 is sized so as to calibrate the rate of fluid dispersion from the holding chamber 12 a into the wicking material 18 . while the wicking material 18 tends to draw the liquid from the chamber 12 a , the presence of air passing through the orifice 38 during this process establishes , in part at least , the flow rate of liquid through the outlet openings 16 into the wicking material 18 . consequently , the size of the orifice 38 formed in the orifice plate 36 controls the rate the liquid chemical held within the chamber 12 is wicked into the wicking material 18 and applied to crop material or other foliage . as discussed in the background of the invention , cotton plants tend to grow at different rates . as a consequence , during the growing season it is typical in a crop of cotton to find uneven growth . that is , under normal growing conditions some of the cotton plants will be higher than others . this is undesirable . for reasons already discussed , it is desirable for the cotton plants be of a uniform maturity as they approach harvest season . in the past , cotton crops have been sprayed with a growth regulating composition such as pix concentrate plant regulator manufactured by basf corporation of research triangle park , n . c . 27709 - 3528 . the active ingredient in many plant growth regulators , including the pix concentrate growth regulator , is mepiquat chloride . the drawbacks and problems of spraying a growth regulating product on cotton has already been addressed . in short , spraying is a most ineffective and inefficient means of applying a growth regulating composition to a non - uniform cotton crop . the present invention contemplates applying such a growth regulating composition directly to select and targeted cotton plants by utilizing the wick applicator 10 to actually engage certain cotton plants and to effectively mop a growth regulating composition onto certain plants . with reference to the schematic of fig4 a tractor 100 is shown therein and includes a three - point hitch arrangement 102 that supports a tool bar 104 . tool bar 104 can be raised and lowered via the tractor &# 39 ; s hydraulic system . secured to the tool bar 104 is a horizontal frame 106 that extends rearwardly therefrom . supporting horizontal frame 106 is a pair of ground engaging wheels 108 . secured about the rear of the horizontal frame 106 is a sub - frame or carrier frame 110 . the carrier frame 110 is vertically adjustable within the horizontal frame 106 . in fact , the carrier frame 110 can be moved up and down with respect to the horizontal frame 106 and stationed at any number of vertical positions . forming a part of the carrier frame 110 is a transversely extending lower connecting bar 112 . the lower connecting bar 112 serves to support and hold the wick applicator 10 thereunder . a series of laterally spaced strap - type clamps , such as hose clamps , can be utilized to secure the wick applicator 10 to the underside of the lower connecting bar 112 . the wick applicator 10 shown in fig4 is designed to treat two rows of cotton as there is provided two sets of holes 16 with the wicking material 18 wrapped around each set of holes 16 . to carry out the process , the cotton grower or operator selects an elevation for the wick applicator 10 . typically , the cotton grower will select the elevation such that as the tractor is propelled through the field , the wick applicator 10 will engage and treat a certain population of cotton plants that extend upwardly to a height comparable to the elevation set for the wick applicator 10 . thus , as the tractor 100 moves through the field with the wick applicator 10 set at a particular elevation relative to the ground g , the wicking material 18 aligned with each row will engage the higher cotton plants and the growth regulating composition wicked into the wicking material 18 will be mopped onto the foliage of these plants . this is particularly illustrated in fig4 . note that the top portion of the higher cotton plant 120 is being engaged and mopped by the wick applicator . also note that the lower cotton plants 122 have upper extremities that lie below the treating elevation selected for the wick applicator 10 consequently , as the tractor loo moves through the field , cotton plants 122 and other plants that are no higher will not be treated . cotton growers may utilize various treating schemes including one or more treatment phases during the growing season . in the way of an example , it is contemplated that the wick applicator 10 of the present invention will be utilized in a first phase treatment program that will occur when the cotton plants reach a height of approximately 14 to 24 inches . this is often referred to as “ pin head square ”. these cotton plants are just beginning to show the growth of bolls and this occurs generally about 6 to 10 weeks after field planting . during this first phase of treatment the object is to selective engage and target that population of the cotton crop that extends above a certain threshold . here , as outlined above , the wick applicator 10 moves over the cotton field at a generally constant elevation with respect to the tractor and the ground . larger cotton plants are engaged and treated directly while smaller cotton plants are passed over by the wick applicator 10 . continuing with the example , after the first phase treatment , there can be a second phase treatment where the cotton grower treats substantially all of the cotton . this would typically take place approximately 10 to 21 days after the first treatment . again , smaller cotton plants can be passed over but generally it is contemplated that a greater percentage of the cotton plants will be contacted and treated during the second phase compared to the first phase . application rates can vary but it is contemplated that for typical applications one would expect an application rate of approximately 1 to 2 ounces per acre of the plant growth regulator , such as the pix concentrate growth regulator . generally , the plant growth regulator is diluted in a solution . in a diluted solution form , a typical application entails applying approximately 8 to 12 ounces of diluted solution containing the plant growth regulator per acre of cotton . to apply the growth regulating composition at the rate described above , the grower can select an orifice 38 of a proper size to yield such an application rate when the applicator is moved through the field at a conventional rate of 4 to 6 miles per hour . to fill the wick applicator 10 of the present invention , cap 22 can be removed from the t - coupler 20 and the chemical to be utilized can be poured into the opening formed in the t - coupler 20 . during periods of non - use , the main on / off valve 28 can be shut off and the tube 12 rotated to where the outlet openings 16 are disposed about a top portion of the tube . this will prevent solution from wicking from the internal chamber 12 a outwardly to the wicking material 18 . it will be appreciated that the wick applicator 10 can be used to apply other solutions and compositions directly to field crops . for example , nutrients such as boron and other fertilizers can be directly applied to plant foliage . from the foregoing specification and discussion , it is seen that the wick applicator 10 of the present invention has the advantage of providing a calibrated wick applicator . in other words , the utilization of the orifice within the air inlet line permits the flow of air into the wick applicator to be precisely controlled . moreover , different application rates can be achieved by simply varying the orifice plate and the size of the orifice formed therein . also , the present invention provides a new method or process for targeting select cotton plants for the purpose of applying a growth regulating composition to the foliage thereof . in the process disclosed herein , a wick applicator is set at a selected elevation with respect to ground level such that the wick applicator will engage only the top portions of cotton plants selected for treatment . the present invention may , of course , be carried out in other specific ways than those herein set forth without parting from the spirit and essential characteristics of the invention . the present embodiments are , therefore , to be considered in all respects as illustrative and not restrictive , and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein .
a wick applicator for applying agricultural liquid chemicals to crops , weeds and other vegetation . the wick applicator includes an elongated tube for holding and dispensing liquid chemicals . an air inlet extends from the tube and is communicatively open to the internal chamber of the tube . to meter or regulate the flow of liquid chemicals from the elongated tube , a non - variable fixed size orifice is disposed in the air inlet tube . in use , the wick applicator is useful in applying a growth regulating composition to the upper portion of a cotton crop . this is achieved by setting the wick applicator at a selected height and then moving it through a cotton field at that height and in the process , engaging and mopping the portion of any cotton crop in its path .