บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Foliar nitrogen uptake and withdrawal from peach leaves during senescence.

Tagliavini, M.; Millard, P.; Quartieri, M.; Marangoni, B.;

Acta Horticulturae Year: 1997 Issue: No. 448 Pages: 459-465 Ref: 14 ref.

1997

บทคัดย่อ

Foliar nitrogen uptake and withdrawal from peach leaves during senescence.

Using N15-labelled fertilizers, the effect of the N status of a tree on the uptake of postharvest foliar N treatment and the withdrawal of N during leaf senescence was investigated. The study was carried out in 1995 on potted, 1-year-old trees of the nectarine cultivar StarkRedGold on peach seedlings GF 305, pruned to leave 2 shoots. Trees received different rates on N through fertigation during the summer to produce a leaf-N status of 4.2 (HN) and 3.1% (LN). Foliar sprays of 2% N15-urea were applied in early September to one of the shoots on each tree. Results indicated that peach leaves were able to retain about 40% of the N applied to the canopy regardless of N status. The N taken up by the leaves was translocated to the perennial organs with higher efficiency than the original N already present in the treated shoot prior to senescence. At leaf abscission, the leaves that had had foliar N contained more N/leaf area than those not sprayed. Total N withdrawal from senescing leaves was similar i

n treated and untreated shoots.