First-year growth response of four Populus trichocarpa נPopulus deltoides clones to fertilizer placement and level

1999 ◽  
Vol 29 (5) ◽  
pp. 554-562 ◽  
Author(s):  
R. van den Driessche
Keyword(s):  
Growth Response ◽  
Populus Deltoides ◽  
Populus Trichocarpa ◽  
First Year ◽  
Fertilizer Placement

First-year growth response of four Populus trichocarpa × Populus deltoides clones to fertilizer placement and level

1999 ◽  
Vol 29 (5) ◽  
pp. 554-562 ◽  
Author(s):  
R van den Driessche
Keyword(s):  
Populus Deltoides ◽  
Populus Trichocarpa ◽  
Hybrid Poplar ◽  
Stem Volume ◽  
First Year ◽  
Total N ◽  
Organic C ◽  
N Concentration ◽  
Leaf N Concentration ◽  
Leaf N

Fertilizer (18:40:0, N:P:K) was applied by two methods, each at different levels, following establishment of a hybrid poplar (Populus trichocarpa Torr. & Gray × Populus deltoides Bartr. ex Marsh.) plantation, containing four clones, on central Vancouver Island. Nitrogen and P were supplied at 0, 100, and 200 kg·ha-1 by banding, and at 0, 25 and 50 kg·ha-1 by placing in holes adjacent to cuttings. After one season, response to placed treatments (mean height 182 cm) was greater than to banded treatments (mean height 149 cm). The 50 kg·ha-1 placed treatment increased stem volume 4.3-fold above control, and the 200 kg·ha-1 banded treatment increased stem volume 2.4-fold above control. Uptake of N and P was about 10-fold greater per kilogram of fertilizer nutrient for placed than banded treatments. Fertilizer increased leaf N concentration, but concentrations of most other nutrients declined despite increased uptake. Significant increases in stem volume occurred when leaf N concentration was about 29 g·kg-1 in clone 1, but 23-25 g·kg-1 in the other clones. Clone 2 tolerated foliage P concentrations below 1.4 g·kg-1 at the greatest growth rates. Stem volume was positively correlated with soil total N% and organic C% in the 16-30 cm horizon.

Bt-Cry3Aa transgene expression reduces insect damage and improves growth in field-grown hybrid poplar

2014 ◽  
Vol 44 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Amy L. Klocko ◽  
Richard Meilan ◽  
Rosalind R. James ◽  
Venkatesh Viswanath ◽  
Cathleen Ma ◽  
...  
Keyword(s):  
Large Scale ◽  
Populus Deltoides ◽  
Integrated Management ◽  
Populus Trichocarpa ◽  
Hybrid Poplar ◽  
Volume Growth ◽  
Field Trials ◽  
Leaf Beetle ◽  
Insect Damage ◽  
Beetle Damage

The stability and value of transgenic pest resistance for promoting tree growth are poorly understood. These data are essential for determining if such trees could be beneficial to commercial growers in the face of substantial regulatory and marketing costs. We investigated growth and insect resistance in hybrid poplar expressing the cry3Aa transgene in two field trials. An initial screening of 502 trees comprising 51 transgenic gene insertion events in four clonal backgrounds (Populus trichocarpa × Populus deltoides, clones 24-305, 50-197, and 198-434; and P. deltoides × Populus nigra, clone OP-367) resulted in transgenic trees with greatly reduced insect damage. A large-scale study of 402 trees from nine insertion events in clone OP-367, conducted over two growing seasons, demonstrated reduced tree damage and significantly increased volume growth (mean 14%). Quantification of Cry3Aa protein indicated high levels of expression, which continued after 14 years of annual or biannual coppice in a clone bank. With integrated management, the cry3Aa gene appears to be a highly effective tool for protecting against leaf beetle damage and improving yields from poplar plantations.

The physiological acclimation and growth response of Populus trichocarpa to warming

2021 ◽  
Author(s):  
J. Aaron Hogan ◽  
Christopher Baraloto ◽  
Cari Ficken ◽  
Miranda D. Clark ◽  
David Weston ◽  
...  
Keyword(s):  
Growth Response ◽  
Populus Trichocarpa ◽  
Physiological Acclimation

scholarly journals Growth hormone therapy in pre-pubertal children with Noonan syndrome: first year growth response and comparison with Turner syndrome

1997 ◽  
Vol 86 (9) ◽  
pp. 943-946 ◽  
Author(s):  
J De Schepper ◽  
BJ Otten ◽  
I François ◽  
J-P Bourguignon ◽  
M Craen ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Hormone Therapy ◽  
Turner Syndrome ◽  
Noonan Syndrome ◽  
Growth Response ◽  
Growth Hormone Therapy ◽  
First Year

scholarly journals Fertilizing of young rubber in the Cameroons.

1960 ◽  
Vol 8 (3) ◽  
pp. 165-178
Author(s):  
H.N. Hasselo
Keyword(s):  
Phosphate Rock ◽  
Growth Response ◽  
Nutrient Status ◽  
Nutrient Supply ◽  
Parent Material ◽  
Rooting Depth ◽  
First Year ◽  
Second Year ◽  
One Year ◽  
Shallow Soils

The growth response to (NH4)2SO4, phosphate rock and KC1, given in all combinations at increasing annual rates of up to 24 oz/tree until the seventh year after planting, was measured by the girth increase of Hevea in three soils formed from the same parent material but possessing different nutrient status and depths to the root-impeding layers. Despite poor nutrient supply in the soil, lack of rooting depth had a greater effect on growth than had nutrient availability; while abundant nutrient supply reduced the unproductive period by half a year, this reduction was at least one year in shallow soils. Annual fluctuations in yield were reduced by balanced application of small amounts of fertilizers. Fertilized trees, opened up at 18-inch girth, yielded 430 lb/acre in the first year whether given balanced fertilizer or not; in the second year, trees given balanced fertilizer yielded 700 lb as compared with 580 lb without fertilizer. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Validating genetic markers of response to recombinant human growth hormone in children with growth hormone deficiency and Turner syndrome: the PREDICT validation study

2016 ◽  
Vol 175 (6) ◽  
pp. 633-643 ◽  
Author(s):  
Adam Stevens ◽  
Philip Murray ◽  
Jerome Wojcik ◽  
John Raelson ◽  
Ekaterina Koledova ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Random Forest ◽  
Growth Hormone Deficiency ◽  
Genetic Markers ◽  
Validation Study ◽  
Growth Response ◽  
Recombinant Human Growth Hormone ◽  
Human Growth ◽  
Hormone Deficiency ◽  
First Year

Objective Single-nucleotide polymorphisms (SNPs) associated with the response to recombinant human growth hormone (r-hGH) have previously been identified in growth hormone deficiency (GHD) and Turner syndrome (TS) children in the PREDICT long-term follow-up (LTFU) study (Nbib699855). Here, we describe the PREDICT validation (VAL) study (Nbib1419249), which aimed to confirm these genetic associations. Design and methods Children with GHD (n = 293) or TS (n = 132) were recruited retrospectively from 29 sites in nine countries. All children had completed 1 year of r-hGH therapy. 48 SNPs previously identified as associated with first year growth response to r-hGH were genotyped. Regression analysis was used to assess the association between genotype and growth response using clinical/auxological variables as covariates. Further analysis was undertaken using random forest classification. Results The children were younger, and the growth response was higher in VAL study. Direct genotype analysis did not replicate what was found in the LTFU study. However, using exploratory regression models with covariates, a consistent relationship with growth response in both VAL and LTFU was shown for four genes – SOS1 and INPPL1 in GHD and ESR1 and PTPN1 in TS. The random forest analysis demonstrated that only clinical covariates were important in the prediction of growth response in mild GHD (>4 to <10 μg/L on GH stimulation test), however, in severe GHD (≤4 μg/L) several SNPs contributed (in IGF2, GRB10, FOS, IGFBP3 and GHRHR). Conclusions The PREDICT validation study supports, in an independent cohort, the association of four of 48 genetic markers with growth response to r-hGH treatment in both pre-pubertal GHD and TS children after controlling for clinical/auxological covariates. However, the contribution of these SNPs in a prediction model of first-year response is not sufficient for routine clinical use.

First-year growth response of cold-stored, nursery-grown aspen planting stock

New Forests ◽  
2006 ◽  
Vol 33 (3) ◽  
pp. 281-295 ◽  
Author(s):  
Lee A. Martens ◽  
Simon M. Landhäusser ◽  
Victor J. Lieffers
Keyword(s):  
Growth Response ◽  
First Year ◽  
Planting Stock
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