Abstract
Among exotic tree species, Poplar (Populus deltoides) is a winter deciduous tree species, which produces maximum litter in a single flush for maintaining soil fertility of plantations through its decomposition and release of nutrients and are chosen primarily for their capacity to achieve high growth rates and wood production over a wide range of sites. Besides these, the short rotation cycle of plantation has one major problem of depletion of nutrients that is caused by frequent harvest of plant, which leaves the site unfertile as a huge quantity of nutrients are removed. Keeping these points in view, the present study was conducted to estimate the biomass production and nutrient removal by eight years old Poplar plantation raised at different spacing in a replicated randomized block design having three spacing of 5 x 4 m, 10 x 2.5 m and 15 x 2.5 m in research area of Department of Forestry, C CSHAU Hisar. Biomass of all the plant parts decreased with increasing tree spacing except that the differences between 10 x 2.5 m and 15 x 2.5 m spacing in respect of leaves and branches biomass were not significant. The total tree biomass including litter fall was higher in 5 x 4 m (415 t/ha) followed by 10 x 2.5 m (330 t/ha) and 15 x 2.5 m (192 t/ha) spacing. Concentration of both primary and secondary nutrients in different plant parts differed significantly at different spacing. Maximum nutrient concentration was recorded in leaves at 15 x 2.5 m spacing. However, Poplar stem accounted for maximum uptake of all the nutrients. Among poplar spacing, closer tree spacing of 5 x 4 m recorded maximum uptake of both primary and secondary nutrients except that K and Mg uptake was maximum at 10 x 2.5 m spacing.
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Claims 8
Claim · model-written summary
Biomass of poplar plant parts declined with increasing tree spacing.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Biomass of all the plant parts decreased with increasing tree spacing except that the differences between 10 x 2.5 m and 15 x 2.5 m spacing in respect of leaves and branches biomass were not significant.”
t0“Poplar (Populus Deltoides)”
Claim · model-written summary
Leaf and branch biomass did not differ significantly between 10 x 2.5 m and 15 x 2.5 m spacing.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences between 10 x 2.5 m and 15 x 2.5 m spacing in respect of leaves and branches biomass were not significant”
t0“Poplar (Populus Deltoides)”
Claim · model-written summary
Total poplar biomass including litter fall was highest at 5 x 4 m spacing, followed by 10 x 2.5 m and 15 x 2.5 m.
- Treatment
- 5 x 4 me0
- Outcome
- total tree biomass including litter falle0
- Direction
- highere0
- Value
- 415 t/hae0
- Qualifier
- 15 x 2.5 m (192 t/ha)e0
- Comparator
- 10 x 2.5 me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total tree biomass including litter fall was higher in 5 x 4 m (415 t/ha) followed by 10 x 2.5 m (330 t/ha) and 15 x 2.5 m (192 t/ha) spacing.”
t0“Poplar (Populus Deltoides)”
Claim · model-written summary
Primary and secondary nutrient concentrations in poplar parts differed significantly by spacing.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentration of both primary and secondary nutrients in different plant parts differed significantly at different spacing.”
t0“Poplar (Populus Deltoides)”
Claim · model-written summary
Maximum poplar nutrient concentration occurred in leaves at 15 x 2.5 m spacing.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum nutrient concentration was recorded in leaves at 15 x 2.5 m spacing.”
t0“Poplar (Populus Deltoides)”
Claim · model-written summary
Poplar stems accounted for maximum uptake of all nutrients.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Poplar stem accounted for maximum uptake of all the nutrients.”
Claim · model-written summary
Spacing of 5 x 4 m produced maximum primary and secondary nutrient uptake, except K and Mg.
- Treatment
- closer tree spacing of 5 x 4 me0
- Outcome
- uptake of both primary and secondary nutrientse0
- Direction
- maximume0
- Qualifier
- except that K and Mg uptake was maximum at 10 x 2.5 m spacinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“closer tree spacing of 5 x 4 m recorded maximum uptake of both primary and secondary nutrients except that K and Mg uptake was maximum at 10 x 2.5 m spacing”
t0“Poplar (Populus Deltoides)”
Claim · model-written summary
K and Mg uptake was maximum under 10 x 2.5 m poplar spacing.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K and Mg uptake was maximum at 10 x 2.5 m spacing”
t0“Poplar (Populus Deltoides)”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.