The residue of maleic hydrazide, a systemic sucker control agent, was quantified on air-cured hurley tobacco (Nicotiana tabacum L.) that had been subjected to different application rates, harvest dates, and combination treatments with a fatty alcohol sucker control agent. Residue levels were decreased by allowing longer periods of time between application and harvest, lower application rates, and the use of single rather than split applications. Residue levels were higher from the upper portions of the plant and from laminae compared to midvein tissue. Levels ranged from 21.0 to 152.3 /ig/g dry weight. Chemical treatment of burley tobacco with sucker retardants significantly increased yields over the nontreated hand-suckered plots especially at late harvest dates.
A tractor-drawn transplanting machine was substantially modified for operation in chemically-killed sods. The modifications included using a rolling coulter, double-disc furrow opener, narrow press wheels and considerable ballast weight. The use of this transplanter makes possible plot and field trials with transplanted-type crops under “no-tillage“ culture.
Sod plots were treated with one or more applications of Paraquat herbicide to kill the vegetation. Tobacco, tomato and pepper plants were established in conventional and no-tillage plots. Plant survivability was generally more variable using no-tillage, but the significant differences were attributed to non-machine cultural problems. The no-till transplanter operátion was adequate under all conditions encountered.
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