The relationships between the hydrocyanic acid potential (HCN‐p) of leaves and whole plants were studied in ‘Piper’ sudangrass, Sorghum bicolor var. sudanense (L.) Moench, and ‘Suhi‐l’, sorghum‐sudangrass hybrid, S. bicolor ✕ S. bicolor var. sudanense, subjected to three cutting managements. The results were: Leaf and whole plant samples from Suhi‐1 were usually higher in HCN‐p than samples from Piper at all harvest dates for the three cutting managements. Plants cut at 10 cm when they reached the early bloom stage had significantly lower average HCN‐p than plants cut at 8 and 20 cm when they reached a height of 50 and 75 cm, respectively. Differences in average HCN‐p for the two latter cutting management were not signifant. There were no significant differences among average HCN‐p of the whorl and the first and third leaves of Piper. For Suhi‐1, no significant difference was found between the average HCN‐p of the whorl and the first leaf. Both the whorl and the first leaf were significantly higher in HCN‐p than the third leaf. There were no consistent trends in HCN‐p associated with successive harvest dates during the season. Most of the simple correlation coefficients between HCN‐p of leaf samples and of whole plants were highly significant, indicating that leaf samples could be used to rank varieties for HCN‐p. Ratios of leaf to whole plant HCN‐p were inconsistent; therefore, such samples are not suitable for estimating the total amount of HCN‐p of whole plants.
A closed-loop method of controlling a pneumatic cylinder is proposed where the cylinder can respond to varying position demands from an external source. The method uses a state space design technique involving the experimental identification of a dynamic model for the cylinder and valve combination. Data for the identification are obtained from an initial phase in which the valve and cylinder are excited by an operator. The controller constants are then derived using a pole placement design technique. The model and control constants are derived within the controller, resulting in automatic tuning. Experimental data are presented in response to step and ramp inputs. With moderate closed-loop bandwidths the response is well damped but as the designed bandwidth increases, lightly damped oscillations occur in the response, probably caused by differences between the responses of the experimental system and its model. If greater closed-loop bandwidths are required further work needs to be done on the form and order of the model.
Leaf symptoms that resembled Mn deficiency were observed on certain oat (Avena sativa L.) cultivars grown on a De Voignes series, fine‐silty, mixed, nonacid, frigid, Histic Humaquepts soil where Mn deficiency had not been previously reported. Results of preliminary field studies confirmed that Mn was deficient for optimum oat growth and suggested that Zn was marginally deficient. In addition, a Mn‐efficient oat cultivar (‘Park’) and a Mn‐efficient oat cultivar (‘Cayuse’) were identified. The objective of this field study was to measure the yield, protein, and test weight responses of Park and Cayuse to applications of Mn and Zn made over a 3‐year period. Foliar applications of 1.8 and 3.6 kg/ha Mn to Park and Cayuse, respectively, increased grain yield an average of 588 and 1,097 kg/ha, respectively. One application of Mn at tillering increased yield as much as Mn applications made at both tillering and boot stages of oat development. Grain protein of Park and Cayuse was increased 2.65 and 0.6% by applications of 9.0 and 3.6 kg/ha Mn respectively in 1971. Neither cultivar showed increased protein from Mn application in subsequent experiments. Test weight was not influenced by Mn application. Zinc did not significantly alter yield, protein, or test weight. However, Zn tended to increase test weight in dry years and tended to increase yield in wet years. Combinations of foliar applied MCPA (sodium salt of 2‐methyl‐4‐chlorophenoxyacetic acid) and Mn, or foliar applied Diuron (3‐(3,4 dichlorophenyl)‐1,1‐dimethylurea) and Mn gave yield increases comparable to Mn alone. Combinations of Mn and Zn were not better than Mn alone.
Absract The construction of a very useful crossing bench is described. It satisfies the four primary requirements that are stated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.