Productivity of first and second rotation stands of radiata pine on sandy soils. I. Site factors affecting early growth

1979 ◽  
Vol 42 (4) ◽  
pp. 226-235 ◽  
Author(s):  
R. O. Squire ◽  
D. W. Flinn ◽  
P. W. Farrell
Keyword(s):  
Sandy Soils ◽  
Radiata Pine ◽  
Early Growth ◽  
Site Factors ◽  
Factors Affecting

scholarly journals A Contribution to the Study of Factors affecting the Quality and Composition of Potatoes

1905 ◽  
Vol 1 (3) ◽  
pp. 347-357 ◽  
Author(s):  
S. F. Ashby
Keyword(s):  
Sandy Soils ◽  
Factors Affecting ◽  
Different Types

The work was undertaken with the hope of establishing some connexion between the characters of soils as shown by chemical and mechanical analyses, and the quality and composition of the potatoes grown on them. As regards quality, most attention has been given to the occurrence of ‘blackening’ after cooking, especially after a second warming up, and an attempt has been made to get at the cause of this phenomenon. This defect has been often complained of by potato growers and dealers, and seriously affects the price of samples marketed for consumption in towns where the largest buyers are hotels and restaurants which demand a potato capable of keeping its colour after a second steaming. ‘Blackening’ is often associated with sandy soils heavily manured with farmyard dung or town manure, and it has been observed in tubers grown with spring dressings of kainite; concordant opinions, however, are not to be had from practical men, and in fact the defect may arise on the most widely different types of soil. In order to exclude disturbances due to variety, ‘Up to Date,’ as one of the most widely grown sorts, has alone been investigated.

Factors affecting transient gene expression in cultured radiata pine cotyledons following particle bombardment

1996 ◽  
Vol 96 (4) ◽  
pp. 630-636 ◽  
Author(s):  
Manuel Rey ◽  
Maria Victoria Gonzalez ◽  
Ricardo J. Ordas ◽  
Raffaela Tavazza ◽  
Giorgio Ancora
Keyword(s):  
Gene Expression ◽  
Particle Bombardment ◽  
Transient Gene Expression ◽  
Radiata Pine ◽  
Factors Affecting

scholarly journals Site Factors Affecting Growth of Slash Pine in the Texas Post Oak Belt

1997 ◽  
Vol 21 (2) ◽  
pp. 71-74
Author(s):  
W. David Hacker ◽  
M. Victor Bilan
Keyword(s):  
Stepwise Regression ◽  
Pinus Elliottii ◽  
Analysis Data ◽  
Height Growth ◽  
Slash Pine ◽  
Stem Analysis ◽  
Site Factors ◽  
Factors Affecting ◽  
Post Oak ◽  
Age Model

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.

Factors affecting the early growth of Leucaena leucocephala

1997 ◽  
Vol 37 (1) ◽  
pp. 27 ◽  
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.

Factors affecting the retention of phosphorus applied as superphosphate to the sandy soils in south-eastern South Australia

Soil Research ◽  
1981 ◽  
Vol 19 (2) ◽  
pp. 167 ◽  
Author(s):  
DC Lewis ◽  
AL Clarke ◽  
WB Hall
Keyword(s):  
Organic Carbon ◽  
South Australia ◽  
Sandy Soils ◽  
Soil Parameters ◽  
Phosphorus Retention ◽  
Phosphorus Sorption ◽  
Leaching Losses ◽  
Factors Affecting ◽  
South Eastern ◽  
Active Iron

The retention of phosphorus applied as superphosphate was measured in 31 multi-rate experiments on siliceous sands in the south-east of South Australia. The amount of phosphorus retained in the top 30 cm of soil and recovered in harvested pasture 5 months after application ranged from 0 to 100% and averaged 57% for an average dressing of 32 kg phosphorus ha-1. Of the eight soil parameters measured, 'active' iron, 'active' aluminium, organic carbon and phosphorus sorption were most closely correlated with phosphorus retention. Combinations of these variables accounted for far more of the variation than did single factors. 'Active' iron and organic carbon accounted for 53.6% of the variation. The inclusion of quadratic 'active' iron and aluminium terms improved the fit with 63.9% of the variation accounted for. Rainfall during the experiments varied from 168 to 484 mm but had no effect on retention. Some agronomic implications of the leaching losses are discussed. It is considered that a measure of 'active' iron and organic carbon could be used as indicators of leaching and could assist in determining phosphorus recommendations in the region.

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