<i>Nitrogen fertilisers in establishing</i>Pinus radiata<i>plantations on sandy soils: an evaluation of their use</i>

Nambiar, E. K. S.; Cellier, K. M.

doi:10.1080/00049158.1985.10674452

Cited by 23 publications

(10 citation statements)

References 8 publications

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“…The L/H treatment increased by the greatest amount after this date until 10 August when no further increments in girth were measured (Table 1). The diameter response is similar to that recorded at the end of a growing season in the field for Pinus radiata by Nambiar and Cellier (1985) and by Thomas and Mead (1992). increments in stem height were similar across all treatments, except for the L/H trees which, from the beginning of May until the middle of August increased by 17.6 cm, which was more rapid than those from the other treatments, the lowest being for the L/L trees (2.8cm).…”

Section: Resultssupporting

confidence: 56%

Root growth and nitrogen uptake in sycamore (Acer pseudoplantanus L.) seedlings in relation to nitrogen supply

Mackie-Dawson¹,

Pratt²,

Millard³

1994

Plant Soil

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Acer pseudoplatanus L. trees were grown in sand culture for 2 years and, in 1988, supplied with either 1.0 mol N m-3 (low N) or 6.0 mol N rnp3 (high N) to precondition their growth. In 1989, the same trees received either high or low nitrogen, producing four treatments; High N in 1988/High N in 1989 High N in 1988iLow N in 1989 Low N in 1988/Law N in 1989 and Low N in 1988/High N in 1989. Plant growth was affected by N supply in both years. In 1989 the Low N/High N treated trees had the same overall mass, leaf mass and stem girth as the High N/High N treatment. Early spring growth of foliage and roots was conditional on nitrogen supplied in the previous season. Later, the rapid increases in leaf, stem and root growth under high N was through root uptake. Internal partitioning of growth was affected, with the Low N/High N treatment producing more new leaves on axillary shoots, and more new white roots on existing structures, than the Low N/Low N treatment. Despite effects of the N preconditioning on the structure of both canopy and root system, nitrogen uptake was solely dependent on the current nitrogen supply.

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Section: Resultssupporting

confidence: 56%

Root growth and nitrogen uptake in sycamore (Acer pseudoplantanus L.) seedlings in relation to nitrogen supply

Mackie-Dawson¹,

Pratt²,

Millard³

1994

Plant Soil

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“…4) . The lack of such response in other experiments (Nambiar and Cellier 1985) was attributed partly to the very low efficiency of N-uptake when fertilizers were placed in spots or narrow bands resulting in poor fertilizer-root contact (Woods 1976 ;Nambiar 1983) . In the present experiment, N fertilizer was broadcast, to improve fertilizer-root contact, and at 14 months after planting, when rates of N uptake by trees were much higher than during the year after planting .…”

Section: Discussionmentioning

confidence: 99%

“…m The effect of weeds on the concentration of soil mineral-N seems especially strong . Nambiar and Cellier (1985) found in a P. radiata plantation mineral-N concentrations of 5 .8 ug g-1 in weedy strips compared to 17 .3 ug g-' in weed-free strips, but no effect on extractable P and K in soil . When weeds are well controlled, concentrations of ineral-N in P. radiata plantations in sandy soils can be as high as 30 1 ug g-' during the first summer after planting (Theodorou and Bowen 1983) .…”

Section: Introductionmentioning

confidence: 99%

Role of weeds in the management of nitrogen in a young Pinus radiata plantation

Smethurst

Nambiar

1989

New Forest

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Application. Weeds in young Pinus radiata plantations can greatly retard tree growth by competing for mineral N . Although tree growth will be improved by maintaining a plantation weed-free or by adding N fertilizer, high N supply can induce stem deformation . Partial weed control may benefit productivity in the long-term because weeds reduce leaching of N .Abstract. Pinus radiata trees were grown on a podzolized sandy soil at a second rotation site under the following treatments: total weed control, total weed control plus ammonium nitrate, strip weed control and no weed control. During the first two summers after planting the differences in needle water potential between trees under no, strip or total weed control were very small . Despite similar rates of net N-mineralization in strip and total weed control treatments, which averaged 64 kg ha ' yr ' in the 0-15 cm soil depth, weeds in the strip weed control treatment reduced soil mineral-N concentrations by 50-80%, leaching of N by the end of the first growing season by 45%, foliar-N concentrations by 4-14% and stem biomass at 20 months after planting by 46% . Although N-uptake by above-ground vegetation (trees plus weeds) was 49% higher in the strip weed control treatment, the amount of N apportioned to trees during the first 20 months after planting was reduced from 15 .5 to 9.0 kg ha' . These effects of weeds were even more pronounced in the no weed control treatment . Since weeds had little effect on the needle water potential of trees and the annual rates of N-mineralization, but adversely affected N-uptake by trees, results indicate that weeds directly competed with trees for N, and thereby aggravated N-deficiency in trees . Application of ammonium nitrate after complete weed control increased foliar-N concentrations, and N-uptake and growth of trees, but also induced severe stem deformation .

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“…The sites on which these experiments were conducted were relatively weed free by local planting site standards, but weeds were uncontrolled and are known to reduce availability of nutrients (Nambiar and Cellier 1985). Greater response to fertilization may therefore be possible with weed control.…”

Section: Discussionmentioning

confidence: 99%

Response of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to some different fertilizers applied at planting

Driessche¹

1988

New Forest

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Application. Douglas-fir responded to 8--16 g N fertilizer placed into the ground, at 15 cm from the tree, at planting. Growth response to N was evident three years after planting and there was little difference between nitrogen containing fertilizers tested. Survival was increased by triple superphosphate on one soil low in P, and decreased by other fertilizers in order, highest to lowest survival: diammonium phosphate m sulphur coated urea > agriform > ammonium sulphate. Fertilizing with a slow releasing N fertilizer, or diammonium phosphate, immediately after planting, may increase growth. The fertilizer should supply about 16 g N per tree and be placed into the ground at 15 cm from the tree.Abstract. Four fertilization at planting experiments were conducted with Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) on eastern Vancouver Island. In experiment 1 Agriform (20--10--5, AGR) and Osmocote (17--7--12, OSM) supplied N at 0, 4.2, 8.4, 16.8 or 33.6 g/tree either broadcast, within 15 cm of the tree, or in a hole 15 cm from the tree (adjacent). In experiment 2 AGR, diammonium phosphate (21--55--0, DAP), ammonium sulphate (21--0--0, AMS), sulphur coated urea (35--0--0, SCU) supplied N at 0, 8.4, 16.8 and 25.2 g/tree. Triple superphosphate (0--45--0, TSP) supplied P at the same levels as DAP: 0, 9.6, 19.2 and 28.8 g/tree. In experiment 3 AGR and SCU (32--0--0) supplied N at 0, 8.4 and 16.8 g/tree. In experiment 4 DAP was used to fertilize trees on five different dates, between March and October, and each treatment supplied 16 g N/tree. Two-year old, bare root, planting stock was used except in experiment 3, where container stock was compared with bare root stock.Little growth response was obtained after one year, but height growth responses of 12 to 31% were measured after 3 to 6 years with fertilizers supply 8.4 to 16.8 g N per tree. Growth responses were little affected by the type of fertilizer and were primarily due to N, with release rate having no marked effect. The exception to this was TSP which did not increase growth but did increase survival. Survival was reduced by AMS and to a lesser extent by AGR. Container seedlings responded more to fertilization at planting than bare root seedlings.Seedling N, P and K concentrations and contents declined following planting for 6 months and only started to recover after July. Application of fertilizer caused a small increase in seedling nutrient concentration regardless of date, but this had no detectable effect on dry weight measured six weeks later.

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Nitrogen fertilisers in establishingPinus radiataplantations on sandy soils: an evaluation of their use

Cited by 23 publications

References 8 publications

Root growth and nitrogen uptake in sycamore (Acer pseudoplantanus L.) seedlings in relation to nitrogen supply

Root growth and nitrogen uptake in sycamore (Acer pseudoplantanus L.) seedlings in relation to nitrogen supply

Role of weeds in the management of nitrogen in a young Pinus radiata plantation

Response of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to some different fertilizers applied at planting

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