Abstract
Over 30% of the Chinese tea plantation is supplied with excess fertilizer, especially nitrogen (N) fertilizer. Whether or not foliar N application on tea plants at the dormancy stage could improve the quality of spring tea and be a complementary strategy to reduce soil fertilization level remains unclear. In this study, the effects of foliar N application on tea plants were investigated by testing the types of fertilizers and their application times, and by applying foliar N under a reduced soil fertilization level using field and 15 N-labeling pot experiments. Results showed that the foliar N application of amino acid liquid fertilizer two times at the winter dormancy stage was enough to significantly increase the N concentration of the mature leaves and improved the quality of spring tea. The foliar application of 2% urea or liquid amino acid fertilizer two times at the winter dormancy stage and two times at the spring dormancy stage showed the best performance in tea plants among the other foliar N fertilization methods, as it reduced the soil fertilization levels in tea plantations without decreasing the total N concentration of the mature leaves or deteriorating the quality of spring tea. Therefore, foliar N application on tea plants at its dormancy stage increases the N concentration of the mature leaves, improves the quality and yield of spring tea, and could be a complementary strategy to reduce soil fertilization levels.
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Claims 5
Claim · model-written summary
Two winter dormancy applications of amino acid liquid fertilizer significantly increased mature leaf nitrogen.
- Taxon
- tea plantse1
- Organ / stage
- mature leavese0
- Treatment
- foliar N application of amino acid liquid fertilizer two times at the winter dormancy stagee0
- Outcome
- N concentration of the mature leavese0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“foliar N application of amino acid liquid fertilizer two times at the winter dormancy stage was enough to significantly increase the N concentration of the mature leaves”
e1“foliar N application on tea plants were investigated”
Claim · model-written summary
The same treatment improved spring tea quality.
- Taxon
- tea plantse1
- Treatment
- foliar N application of amino acid liquid fertilizer two times at the winter dormancy stagee0
- Outcome
- quality of spring teae0
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“foliar N application of amino acid liquid fertilizer two times at the winter dormancy stage was enough to significantly increase the N concentration of the mature leaves and improved the quality of spring tea”
e1“foliar N application on tea plants were investigated”
Claim · model-written summary
Twice applied 2% urea in each dormancy stage allowed reduced soil fertilization without lowering mature leaf nitrogen or tea quality.
Verbatim
e0“foliar application of 2% urea or liquid amino acid fertilizer two times at the winter dormancy stage and two times at the spring dormancy stage showed the best performance in tea plants among the other foliar N fertilization methods, as it reduced the soil fertilization levels in tea plantations without decreasing the total N concentration of the mature leaves or deteriorating the quality of spring tea”
Claim · model-written summary
Twice applied liquid amino acid fertilizer in each dormancy stage allowed reduced soil fertilization without lowering mature leaf nitrogen or tea quality.
- Taxon
- tea plantse0
- Treatment
- liquid amino acid fertilizer two times at the winter dormancy stage and two times at the spring dormancy stagee0
- Outcome
- total N concentration of the mature leaves or deteriorating the quality of spring teae0
- Direction
- without decreasinge0
- Comparator
- other foliar N fertilization methodse0
Verbatim
e0“foliar application of 2% urea or liquid amino acid fertilizer two times at the winter dormancy stage and two times at the spring dormancy stage showed the best performance in tea plants among the other foliar N fertilization methods, as it reduced the soil fertilization levels in tea plantations without decreasing the total N concentration of the mature leaves or deteriorating the quality of spring tea”
Claim · model-written summary
Dormancy stage foliar nitrogen was proposed as a complement to reduced soil fertilization.
Verbatim
e0“foliar N application on tea plants at its dormancy stage increases the N concentration of the mature leaves, improves the quality and yield of spring tea, and could be a complementary strategy to reduce soil fertilization levels”
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