Sentence:  And ſuch a double Sowing is of the greateſt Importance; for on the thick Growth of a Crop very much depends on the Bigneſs of it at Harveſt, becauſe, by ſuch a thick Growth, the Weeds are overcome and kept down from hurting the Oats; and, likewiſe, the Heats and Droughts kept the better out from parching up the Roots of the Oats, which, in too thin a Crop, often prove fatal to it; for, when Oats are ſown in the random or <WSD>broadcaſt</WSD> Way, there is no more Mold allowed their Roots than what the Harrows and Roll give them; which, at beſt, is but a ſuperficial and moſt thin Covering, and, therefore, the more liable to ſuffer by Droughts, which is different from the Way of ſowing Oats in Drills. 
Meaning of the word marked with <WSD> tags:  (omnidirectionally) Cast or scattered widely in all directions; cast abroad.