A review of site factors affecting the early growth of ash (Fraxinus excelsior L.)

Abstract A study was conducted in the Post Oak Belt of East Texas to determine which site factors affected height growth of slash pine (Pinus elliottii Engelm.). Height-age pairs were developed from stem analysis data. Nonlinear regression was implemented to develop a generalized height-age model. After curves were developed, stepwise regression was used to determine impacts of environmental variables on height growth. Environmental factors correlated with height growth included A horizon depth and those related to moisture relations including seasonal precipitation, average daily temperature, and texture of the A horizon. South. J. Appl. For. 21(2):71-74.

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Factors affecting the early growth of Leucaena leucocephala

Australian Journal of Experimental Agriculture ◽

10.1071/ea96008 ◽

1997 ◽

Vol 37 (1) ◽

pp. 27 ◽

Cited By ~ 5

Author(s):

N.J Brandon ◽

H.M Shelton

Keyword(s):

Arbuscular Mycorrhiza ◽

Plant Height ◽

Leucaena Leucocephala ◽

Field Experiments ◽

Dry Weight ◽

Early Growth ◽

The Other ◽

Factors Affecting ◽

Height Increase ◽

Major Factors

Summary. Slow establishment has been identified as a major limitation to the more widespread adoption of the fodder tree Leucaena leucocephala in Queensland. Field experiments were conducted at Mt Cotton, Gayndah and Theodore in south-east Queensland during the 1987–88 summer to identify the major factors limiting first year yield of leucaena. Treatments at each site included irrigation (applied at sowing only, or at intervals throughout the trial), and rates of phosphorus (P), nitrogen (N) and lime. Attack by psyllid insects, weed competition and defoliation by wildlife were noted and minimised where possible. Soil moisture appeared to be the major limitation to plant growth at the inland sites of Theodore and Gayndah where post-establishment irrigation increased final dry weight by 250%. Waterlogging reduced plant height increase at the low lying Mt Cotton site following higher than normal rainfall. Increase in plant height at the other sites stopped when night temperatures fell below 15°C. Application of P at 75–1200 kg/ha tripled final dry weight of leucaena at Mt Cotton (5 mg/kg bicarbonate-extractable P) but had no effect at Theodore (10 mg P/kg) or Gayndah (35 mg P/kg). Larger than normal responses to P during early growth may be due to slow colonisation of the roots by arbuscular mycorrhiza. Application of N (200 kg N/ha) increased dry weight of Rhizobium-inoculated leucaena by 27% at Theodore but had little or no effect at the other sites. Application of lime had no significant effects on plant height or dry weight of leucaena at Mt Cotton despite the soil being slightly acidic (pH 5.9 in 1 : 5 H2 O suspension). Further work on the role of colonisation by arbuscular mycorrhiza fungi in determining uptake of P by leucaena is warranted in view of the large response to very high rates of P in young seedlings at Mt Cotton.

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Emetogenicity of multiday chemotherapy regimens: Drug and patient factors affecting control of CINV

Journal of Clinical Oncology ◽

10.1200/jco.2009.27.15_suppl.e20683 ◽

2009 ◽

Vol 27 (15_suppl) ◽

pp. e20683-e20683

Author(s):

J. D. Howell ◽

H. Brown

Keyword(s):

Single Agent ◽

Dose Intensity ◽

Predictive Performance ◽

Stepwise Logistic Regression ◽

Poor Control ◽

Site Factors ◽

Stepwise Logistic Regression Analysis ◽

Age And Gender ◽

Factors Affecting ◽

And Gender

e20683 Background: Multi-day chemo regimens have particular advantages in increasing tolerability and maintaining dose intensity of combination cytotoxic therapy. However repeated daily insults of therapy can make control of CINV challenging. Increased knowledge of factors affecting poor control of multi-day chemo, under current CINV prevention conditions, would be beneficial. Methods: A dataset of 621 patients treated in a blinded, randomised non-inferiority study (Grunberg SM, Gabrial NY, Clark G, MASCC 2007, Abstract # 18) of a granisetron transdermal patch (TDS, Sancuso) and oral granisetron, was analysed. As TDS was shown to be non-inferior to oral granisetron, data from both arms were used. All patients had received 3–5 days of moderately or highly emetogenic chemotherapy. Total Control of CINV over Day 1 and Days 1–3 was used as the efficacy endpoint. Stepwise logistic regression analysis was used to assess the predictive performance of patient and chemotherapy factors. Wald chi-squared statistics and Akaike criteria were used to measure significance of predictive factors and model fit, respectively. Results: The simple sum of emetogenicity scores of each cytotoxic (Grunberg SM,(2005) Evaluation of new antiemetic agents_an update. Support Care Cancer (2005) 13: 80–84) provided best overall prediction of emetogenicity of the multiday regimen. Cisplatin was more emetogenic and doxorubicin less so compared to established scoring (Grunberg SM,(2005) Evaluation of new antiemetic agents_an update. Support Care Cancer (2005) 13: 80–84). Age and gender were significant in predicting control: females <60 and males <40years being at risk. A genitourinary site of cancer was also an independent risk factor. Smoking, alcohol use, previous chemotherapy and performance score had no significant effect on risk of CINV. Conclusions: Established emetogenicity scores, derived from historical data on untreated patients, are relevant to multi-day chemo but could be revised to improve prediction of CINV. Cisplatin has a stronger impact on poor control in multi-day than single-agent scoring predicts. Age and gender factors remain important; but with different age breaks for male and female. These and tumour site factors should be taken into account when designing clinical trials or analysing data relating to antiemetics and CINV. [Table: see text]

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A MODEL FOR EVALUATING AND COMPARING SOIL AND SITE FACTORS AFFECTING PRODUCTIVITY OF DISTURBED AND UNDISTURBED SIMILAR AND DISSIMILAR SOILS

Journal American Society of Mining and Reclamation ◽

10.21000/jasmr09011248 ◽

2009 ◽

Vol 2009 (1) ◽

pp. 1248-1275

Author(s):

H. Raymond Sinclair, Jr. ◽

Robert R. Dobos ◽

Sharon W. Waltman ◽

Karl W. Hipple ◽

Joseph V. Chiaretti

Keyword(s):

Site Factors ◽

Factors Affecting

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Factors affecting the growth and condition of lake whitefish (Coregonus clupeaformis)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f09-139 ◽

2009 ◽

Vol 66 (12) ◽

pp. 2096-2108 ◽

Cited By ~ 37

Author(s):

Michael D. Rennie ◽

W. Gary Sprules ◽

Timothy B. Johnson

Keyword(s):

Growth Rates ◽

Environmental Variables ◽

Comprehensive Evaluation ◽

Early Growth ◽

Coregonus Clupeaformis ◽

Lake Whitefish ◽

Catch Per Unit Effort ◽

Factors Affecting ◽

Biological Variables ◽

Alternative Hypotheses

Though declines in the growth and condition of Great Lakes lake whitefish ( Coregonus clupeaformis ) have been largely attributed to food web disruptions caused by invasive dreissenid mussels, a comprehensive evaluation of alternative hypotheses is currently lacking. Using various statistical approaches, we evaluated 69 years of data from the inner basin of South Bay, Lake Huron, considering the role of biological variables (food availability as Diporeia abundance and lake whitefish relative abundance as catch per unit effort, CPUE) versus environmental variables (climate change as growing degree days >5 °C and productive habitat capacity as percent epilimnetic volume, EV) on the condition and early growth rates of resident lake whitefish. Consistently, biological variables (Diporeia abundance, CPUE) best explained changes in lake whitefish growth and condition, respectively, in years when Diporeia data were available. In their absence, environmental variables (EV) best explained early growth rates of lake whitefish, whereas CPUE again best explained lake whitefish condition. Our analysis revealed that environmental change contributed significantly but alone was not sufficient to explain declines in lake whitefish growth after dreissenid establishment, whereas biological variables considered here could account for the majority of growth and condition changes observed in this population.

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