A comparison of growth responses of Douglas fir and Sitka spruce to different nitrogen, phosphorus, and potassium levels in sand culture

1968 ◽  
Vol 46 (5) ◽  
pp. 531-537 ◽  
Author(s):  
R. van den Driessche
Keyword(s):  
Weight Ratio ◽  
Sitka Spruce ◽  
Douglas Fir ◽  
Response To Treatment ◽  
Sand Culture ◽  
Mineral Nutrient ◽  
Growth Responses ◽  
Net Assimilation ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Douglas fir and Sitka spruce seedlings were grown in sand culture under controlled mineral nutrient conditions. Nitrogen, phosphorus, and potassium supply levels were varied one nutrient at a time in three separate experiments. The relative growth rate (RGR) of Sitka spruce was found to be higher than that of Douglas fir at high levels of N and K supply, although in all treatments the total dry matter production of Douglas fir was greater than that of Sitka spruce after 95 days. At low levels of P supply the RGR of Douglas fir was greater than that of Sitka spruce.Effects of treatment on RGR were apparently achieved mainly by their effect on net assimilation rate, but leaf weight ratio also showed a small, and significant, response to treatment.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce

1955 ◽  
Vol 8 (3) ◽  
pp. 301 ◽  
Author(s):  
DW Goodall ◽  
AE Grant Lipp ◽  
WG Slater
Keyword(s):  
Plant Material ◽  
Dry Weight ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Development ◽  
Culture Experiment ◽  
Foliage Plants ◽  
Phosphorus And Potassium ◽  
The Relationship ◽  
Nitrogen Phosphorus

A sand-culture experiment with lettuces is described, having as its principal purpose the study of the relationship between the potential responses of plants to applications of nitrogen, phosphorus, and potassium fertilizers and the composition of. their foliage. Plants were supplied initially with five levels of these nutrients in all combinations, samples of plant material were taken fot analysis at various stages of development, and at 44 days from sowing additional quantities of nutrients were supplied to some of the cultures in order that their response potentialities might be determined. The present paper analyses the effects of the nutrient interactions on plant dry weight, further results being left to subsequent papers.

scholarly journals FECUNDITY OF THE ROOT WEEVILS BRACHYRHINUS SULCATUS AND SCIOPITHES OBSCURUS ON STRAWBERRY AT DIFFERENT CONDITIONS OF HOST PLANT NUTRITION

1965 ◽  
Vol 45 (3) ◽  
pp. 219-225 ◽  
Author(s):  
W. T. Cram
Keyword(s):  
Plant Nutrition ◽  
Nitrogen Nutrition ◽  
Sand Culture ◽  
Apparent Effect ◽  
Root Weevils ◽  
Black Vine Weevil ◽  
Cyclodiene Insecticides ◽  
Low Levels ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Field applications to strawberry of nitrogen, phosphorus and potassium had no significant effect on the fecundity of the obscure root weevil, Sciopithes obscurus Horn, fed on detached leaflets in the laboratory, but when nitrogen was not applied there was a significant reduction in the fecundity of the black vine weevil, Brachyrhinus sulcatus (F.). With strawberry in sand culture, low levels of nitrogen had no apparent effect on the fecundity of S. obscurus but were associated with a significant reduction in the fecundity of B. sulcatus. Some association is suggested between the different effects of nitrogen nutrition on these species and their different susceptibilities to cyclodiene insecticides.

Growth analysis of four nursery-grown conifer species

1968 ◽  
Vol 46 (11) ◽  
pp. 1389-1395 ◽  
Author(s):  
R van den. Driessche
Keyword(s):  
White Spruce ◽  
Sitka Spruce ◽  
Douglas Fir ◽  
Extension Growth ◽  
Seasonal Patterns ◽  
Seasonal Fluctuations ◽  
Conifer Species ◽  
Relative Growth ◽  
Stem Extension ◽  
Net Assimilation

Annual pattern of relative growth rate (RGR) and stem extension growth were examined in four 1-year-old conifer species grown at two nurseries. Net assimilation rate (NAR) and needle area ratio (F) were calculated for a 14-day period in June. Seasonal patterns of RGR in Douglas fir and Sitka spruce were similar, but RGR of white spruce was lower and showed a different pattern. Seasonal fluctuations in RGR may have been associated with changes in rate of stem extension growth in Douglas fir and Sitka spruce, but not in white spruce or hemlock. Differences in NAR had a greater effect on RGR than differences in F during June. In particular, low RGR was mainly due to low NAR in white spruce.

Accumulation and distribution of mineral elements in the annual lupins Lupinus albus L. and Lupinus angustifolius L

1978 ◽  
Vol 29 (2) ◽  
pp. 267 ◽  
Author(s):  
PJ Hocking ◽  
JS Pate
Keyword(s):  
Lupinus Albus ◽  
Sufficient Conditions ◽  
Mineral Elements ◽  
Sand Culture ◽  
Dry Matter Accumulation ◽  
Phosphorus And Potassium ◽  
Calcium Iron ◽  
Potassium Magnesium ◽  
Nitrogen Phosphorus ◽  
Iron And Manganese

The mineral nutrition of L. albus and L. angustifolius was studied under nutrient-sufficient conditions in sand culture. Mineral accumulation by both species was closely synchronized with dry matter accumulation. Fruits acquired major proportions of the nitrogen, phosphorus, potassium, magnesium and zinc of both species. Leaflets were major sites of accumulation of calcium, iron and manganese; stem and petioles accumulated substantial amounts of potassium, phosphorus, magnesium, copper and sodium. Intensities of intake of calcium, magnesium and iron by roots of L. angustifolius were higher than in L. albus. The situation was reversed for sodium. Cotyledon reserves of nitrogen, phosphorus, potassium and zinc were mobilized to seedling parts with 85–97% efficiency, other elements much less effectively. During fruiting, vegetative parts of the shoot showed net losses of 60–80% of their nitrogen, phosphorus and potassium, 20–50% of their magnesium, iron, zinc, manganese and copper, and less than 15% of their calcium and sodium. Mobilization from vegetative structures was generally more efficient in L. albus than in L. angustifolius. Leaflets showed higher mobilization efficiencies than stem and petioles. Post-anthesis mobilization furnished the equivalent of 23–59% of the fruit's intake of nitrogen, phosphorus, potassium, magnesium and manganese, 10–25% of the zinc, calcium, iron and copper, and 2% or less of the sodium. Nitrogen, phosphorus and potassium attained higher concentrations in fruits than in mature, non-reproductive parts; less mobile elements (calcium, sodium, iron and manganese) showed the opposite effect. Concentrations of sodium and manganese were especially low in fruits of L. angustifolius compared with L. albus.

scholarly journals Tropical tree seedling growth responses to nitrogen, phosphorus and potassium addition

2011 ◽  
Vol 100 (2) ◽  
pp. 309-316 ◽  
Author(s):  
Louis S. Santiago ◽  
S. Joseph Wright ◽  
Kyle E. Harms ◽  
Joseph B. Yavitt ◽  
Carmi Korine ◽  
...  
Keyword(s):  
Seedling Growth ◽  
Tropical Tree ◽  
Growth Responses ◽  
Tree Seedling ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Potassium Addition ◽  
Tree Seedling Growth

A comparison of the fine root component of a pure and a mixed coniferous stand

1988 ◽  
Vol 18 (11) ◽  
pp. 1416-1426 ◽  
Author(s):  
H. M. McKay ◽  
D. C. Malcolm
Keyword(s):  
Fine Roots ◽  
Standing Crop ◽  
Fine Root ◽  
Sitka Spruce ◽  
Nitrogen And Phosphorus ◽  
Mixed Stands ◽  
Method Of Calculation ◽  
The Mean ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Fine roots were sampled at monthly intervals during 1984–1985 in pure plots of Sitka spruce (Piceasitchensis (Bong.) Carr.) and mixed plots of Scots pine (Pinussylvestris L.) and Sitka spruce established on an upland heath in 1969. Both types of planting had received phosphorus and potassium fertiliser but no nitrogen. The mean standing crop of live roots (<2 mm diameter) in the top 5 cm of pure spruce plots was 112 g • m−2, almost double that of mixed stands (37 g • m−2 of spruce plus 20 g • m−2 of pine). Necromass was 80% of total mass in both stand types. Concentrations of nitrogen and phosphorus were greater in pure plots than in mixed plots, but fine root capital of nitrogen, phosphorus, and potassium was greater in pure spruce than in mixed plots (biomass and necromass contained 11, 2, and 5 and 45, 4, and 7 kg • ha−1 of nitrogen, phosphorus, and potassium, in pure plots, and 7, 1, and 3 and 30, 3, and 3 kg • ha−1 of nitrogen, phosphorus, and potassium in mixed plots, respectively). Production of fine roots in pure and mixed stands was estimated at 181 and 97 g • m−2•year−1 or 715 and 367 g • m−2•year−1, respectively, depending on the method of calculation. Fine roots of pure plots were highly concentrated in the top 3 cm. In mixture, spruce roots had a less extreme vertical distribution and pine roots were more evenly distributed down to 9 cm.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce III. Nitrogen Content and Response to Nitrogen

1957 ◽  
Vol 10 (3) ◽  
pp. 253 ◽  
Author(s):  
WG Slater ◽  
DW Goodall
Keyword(s):  
Dry Matter ◽  
Nitrate Nitrogen ◽  
Analytical Data ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Growth ◽  
Matter Production ◽  
Subsequent Response ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Lettuce plants grown in sand culture, and receiving nitrogen, phosphorus, and potassium at five levels in all combinations, were analysed at different stages of growth for total, soluble, and nitrate nitrogen. An attempt was made to relate these analytical data to the subsequent response (in dry matter production) shown by the plants when a further amount of nitrogen was supplied.

Studies in oil-seed crops I. Factors controlling seed production in linseed (Linum usitatissimum)

1951 ◽  
Vol 41 (3) ◽  
pp. 256-270 ◽  
Author(s):  
G. E. Blackman ◽  
E. S. Bunting
Keyword(s):  
Field Experiments ◽  
Linseed Oil ◽  
Mineral Nutrient ◽  
Seed Composition ◽  
Yield Level ◽  
Combined Application ◽  
Phosphorus And Potassium ◽  
Seed Crops ◽  
Nitrogen Phosphorus ◽  
Oil Seed Crops

Between 1941 and 1946 some twenty-five field experiments were carried out at various centres in England to assess the factors which determine the yield level and seed composition of linseed (oil flax). The experiments were of multifactorial design, and the main variables studied were varietal differences, levels of mineral nutrient supply and plant population. Additions of nitrogen (35 lb./acre) over all experiments raised the yield of seed by 10%, whereas additional phosphorus (50 lb. P2O5/acre) or potassium (80 lb. K2O/acre) had small and inconsistent effects. A significant interaction between nitrogen and variety was recorded in one trial, but in twelve out of fourteen experiments the varieties reacted uniformly to a combined application of nitrogen, phosphorus and potassium, while in the remaining two experiments the interactions were contradictory.

Sign in / Sign up

Export Citation Format

Share Document