The concentration of the essential ingredients for application to a crop by conventional ground methods is preferably within the range of 0.001 to 10 percent, especially 0.005 to 5 percent by weight of the total composition, but {HEAD ~ more concentrated compositions} containing up to 20 percent by weight may be desirable in {TAIL ~ the case} of aerial sprays but with corresponding loss in economy 
desirable in
The concentration of the essential ingredients for application to a crop by conventional ground methods is preferably within the range of 0.001 to 10 percent , especially 0.005 to 5 percent by weight of the total composition , but { HEAD ~ more concentrated compositions } containing up to 20 percent by weight may be desirable in { TAIL ~ the case } of aerial sprays but with corresponding loss in economy
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