Abstract
Pinus wallichiana seeds were sown in polybags filled with sterilized riverbed sand in 2010. Seedlings were thinned out to one seedling per polybag, which were treated weekly with Ingestad pretreatment nutrientsolution for 4 weeks and then were fertigated with nitrogen levels of 0.99, 1.98, 2.97, 3.96, 4.95, 5.94, 6.93, 7.92, 8.91 and 9.90 mg and fixed levels of phosphorus, potassium, calcium and magnesium dissolved in 50 ml of water seedling-1 week-1 upto or until 28 weeks. Biomass allocation to needles, (separated by hand from shoot axis), stem (Includes hypocotyls and epicotyls) and roots increased significantly with the increase in nitrogen level and seedling age. At 7.92 mg level of nitrogen fertigation biomass allocation and nitrogen concentration partitioning at 28 weeks got increased by 190, 32 and 44%, and 179, 101 and 147% in needles, stem and roots, respectively as compared to control. Nitrogen concentration in shoot and root decreased at lower nitrogen level as seedlings age increased, but increased at higher nitrogen fertigation levels in needles, stem and roots. To the end of the experiment, nitrogen uptake per seedling increased, whereas, nitrogen use efficiency (NUE) decreased with the increasing nitrogen levels. Key words: Pinus wallichiana, Biomass allocation, nitrogen partitioning, nitrogen uptake, nitrogen use efficiency (NUE).
Highlights
Pinus wallichiana Jackson (Kail pine) is a one of the important timber species of wealthy coniferous forests of Kashmir
Seedlings were thinned out to one seedling per polybag, which were treated weekly with Ingestad pretreatment nutrient solution for 4 weeks and were fertigated with nitrogen levels of 0.99, 1.98, 2.97, 3.96, 4.95, 5.94, 6.93, 7.92, 8.91 and 9.90 mg and fixed levels of phosphorus, potassium, calcium and magnesium dissolved in 50 ml of water seedling-1 week-1 upto or until 28 weeks
The present investigation has been undertaken to know the optimal range of nitrogen for P. wallichiana with the following objectives: the first is to study the pattern of biomass allocation in P. wallichiana seedlings and second is to study nitrogen partitioning, nitrogen uptake efficiency and nitrogen use efficiency (NUE) in P. wallichiana seedlings
Summary
Pinus wallichiana Jackson (Kail pine) is a one of the important timber species of wealthy coniferous forests of Kashmir. It accelerate shoot and root growth, modify tissue nutrient contents and the amount of available reserves, improve post-transplant rooting and growth capacity, and increase resistance to water stress, low temperature and disease (Landis, 1985; Haase and Rose, 1997; Shaw et al, 1998; Grossnickle, 2000), such properties are of vital importance for successful seedling establishment under unfavorable conditions (Puttonen, 1997; Birchler et al, 1998). The morphological studies have shown that nutrient status of nursery seedlings played a significant role in post planting response Keeping this in view, the present investigation has been undertaken to know the optimal range of nitrogen for P. wallichiana with the following objectives: the first is to study the pattern of biomass allocation in P. wallichiana seedlings and second is to study nitrogen partitioning, nitrogen uptake efficiency and nitrogen use efficiency (NUE) in P. wallichiana seedlings
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