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- Author or Editor: Kenneth C. Sanderson x
Abstract
Drenches and sprays of α-cyclopropyl-α (p-methoxyphenyl)-5 pyrimidinemethanol (ancymidol) were comparable to 2,4-dichlorobenzyl-tributylphosphonium chloride (CBBP, Phosfon) in inhibiting stem growth of the ‘Georgia’ Easter lily. Both materials produced plants with enlarged, thin-walled sclerenchymatous stem cells. Some of the higher rates of ancymidol delayed flowering and reduced the number of flowers per plant. Drenches of (2-chloroethyl)phosphonic acid (ethephon) and sprays of ethyl hydrogen 1-propylphosphonate (EHPP) showed some promise as deflowering agents in commercial lily bulb production.
Abstract
Chamaecereus silvestri (Spreg.) Britt & Rose ‘Peanut cactus’, Mammillaria elongata D.C. ‘Gold Star’, and Opuntia microdasys (Lehm.) Pfeiff. ‘Bunny Ears’ were grown on an 8-hr natural photoperiod (short) or an 8-hr natural plus 4-hr incandescent light from 10:00 pm to 2:00 am photoperiod (long) and treated with single sprays of growth regulators. Ethephon or the long photoperiod increased shoots on Opuntia. Gibberellic acid alone or BA alone increased Mammillaria and Chamaecereus shoot number linearly, whereas GA plus BA reduced shoot number. Chamaecereus and Opuntia plants grown on a long photoperiod produced more shoots than plants grown on the short photoperiod. Ethephon reduced the dry weight of all cacti tested. Dry weight of untreated Mammillaria and Opuntia plants exceeded that of growth regulator-treated plants. Opuntia plants produced more dry weight on the long photoperiod than on the short photoperiod. GA increased the growth of glochids on Opuntia and Mammillaria. Chemical names used: A-(phenylmethyl-1H-purin-6-amine (BA); (2-chloroethyl)phosphonic acid (ethephon); and gibberellic acid (GA).
Abstract
Of various controlled-release fertilizer materials, tested on African violet (Saintpaulia ionantha H. Wendl) at 300, 600, and 900 kg/ha for leachate soluble salts, Ca, P, K, and Mg and plant injury, Scott 25.0–4.4–8.3 gave the best result and Scott 15.0–8.7–4.2 gave the poorest result. Precise 8.0–4.8–4.2 leachate generally contained more Ca and Mg and lower leachate soluble salts, but was lower in P and K than the other fertilizers. With the exception of Precise, the leachate soluble salts of most of the fertilizers was initially (10th irrigation) too high. The 900 kg/ha rates for some fertilizers caused high leachate soluble salts and plant injury.