Abstract
The impact of potassium fertilization on disease resistance in Korla fragrant pear trees was evaluated under drip irrigation to determine the optimal application rate. Seven- to eight-year-old trees were subjected to four K treatments: the control (K0, 0 kg/hm) and applications of 75 (K75), 150 (K150), and 225 kg/hm2 (K225). Disease resistance indices in current-year shoots and old branches were assessed throughout growth stages, and correlations with branch mineral contents were analyzed. The K75 treatment significantly increased branch Ca and Mg contents and enhanced flavonoid and lignin contents and PAL activity relative to K0. The K150 treatment markedly raised N, P, K, Fe, Mn, and Cu contents, as well as flavonoid, lignin, soluble sugar, PPO, and PAL levels, with optimal effects on flavonoids and old branch PAL activity. The K225 treatment mildly reduced Ca and Mg but strongly elevated total phenols, flavonoids, lignin, soluble sugars, PPO, and PAL, exerting the greatest influence on total phenols, soluble sugars, PPO, and current-year shoot PAL. K rates were significantly correlated with disease resistance indices. Branch mineral contents showed highly significant correlations with resistance indices and yield, but resistance indices were not significantly associated with yield. Potassium directly modulated resistance indices, with mineral elements exerting more pronounced effects in current-year shoots. Application of 150 kg/hm K is proposed as the optimal rate to improve disease resistance, mineral nutrition, tree vigor, survival, and yield in 7–8-year-old Korla fragrant pear orchards.
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Claims 12
Claim · model-written summary
K75 significantly increased branch Ca and Mg contents relative to K0.
Verbatim
e0“The K75 treatment significantly increased branch Ca and Mg contents and enhanced flavonoid and lignin contents and PAL activity relative to K0”
t0“Korla Fragrant Pear”
Claim · model-written summary
K75 enhanced branch flavonoid and lignin contents and PAL activity relative to K0.
Verbatim
e0“The K75 treatment significantly increased branch Ca and Mg contents and enhanced flavonoid and lignin contents and PAL activity relative to K0”
t0“Korla Fragrant Pear”
Claim · model-written summary
K150 raised branch N, P, K, Fe, Mn and Cu contents.
Not reportedComparator
Verbatim
e0“The K150 treatment markedly raised N, P, K, Fe, Mn, and Cu contents”
t0“Korla Fragrant Pear”
Claim · model-written summary
K150 raised flavonoid, lignin, soluble sugar, PPO and PAL levels.
- Taxon
- Korla fragrant peart0
- Treatment
- K150t1
- Outcome
- flavonoid, lignin, soluble sugar, PPO, and PAL levelse0
Not reportedComparatorDirection
Verbatim
e0“as well as flavonoid, lignin, soluble sugar, PPO, and PAL levels”
t0“Korla Fragrant Pear”
t1“The K150 treatment markedly raised”
Claim · model-written summary
K225 mildly reduced branch Ca and Mg.
Not reportedComparator
Verbatim
e0“The K225 treatment mildly reduced Ca and Mg”
t0“Korla Fragrant Pear”
Claim · model-written summary
K225 elevated total phenols, flavonoids and lignin.
- Taxon
- Korla fragrant peart0
- Treatment
- K225e0
- Outcome
- total phenols, flavonoids, lignine0
- Direction
- elevatede0
Not reportedComparator
Verbatim
e0“The K225 treatment mildly reduced Ca and Mg but strongly elevated total phenols, flavonoids, lignin, soluble sugars, PPO, and PAL”
t0“Korla Fragrant Pear”
Claim · model-written summary
K225 elevated soluble sugars, PPO and PAL.
Not reportedComparator
Verbatim
e0“strongly elevated total phenols, flavonoids, lignin, soluble sugars, PPO, and PAL”
e1“The K225 treatment mildly reduced Ca and Mg”
t0“Korla Fragrant Pear”
Claim · model-written summary
Potassium rates were significantly correlated with disease resistance indices.
Not reportedDirection
Verbatim
e0“K rates were significantly correlated with disease resistance indices”
t0“Korla Fragrant Pear”
Claim · model-written summary
Branch mineral contents were highly significantly correlated with resistance indices.
Not reportedDirection
Verbatim
e0“Branch mineral contents showed highly significant correlations with resistance indices and yield”
t0“Korla Fragrant Pear”
Claim · model-written summary
Branch mineral contents were highly significantly correlated with yield.
Not reportedDirection
Verbatim
e0“Branch mineral contents showed highly significant correlations with resistance indices and yield”
t0“Korla Fragrant Pear”
Claim · model-written summary
Resistance indices were not significantly associated with yield.
- Taxon
- Korla fragrant peart0
- Organ / stage
- Korla fragrant peart0
- Outcome
- yielde0
- Qualifier
- resistance indicese0
Not reportedDirection
Verbatim
e0“resistance indices were not significantly associated with yield”
t0“Korla Fragrant Pear”
Claim · model-written summary
The authors propose 150 kg/hm K as optimal for improving resistance, nutrition, vigor, survival and yield.
Verbatim
e0“Application of 150 kg/hm K is proposed as the optimal rate to improve disease resistance, mineral nutrition, tree vigor, survival, and yield in 7–8-year-old Korla fragrant pear orchards”