Effect of Nitrogen Reduction Fertilization on Leaf Quality and Yield of Korla Fragrant Pear

doi:10.7668/hbnxb.20195447

Abstract

Abstract:

To investigate the effect of applying different gradients of nitrogen reduction on leaf production capacity of Korla fragrant pear,no fertilizer treatment(CK),no nitrogen fertilizer treatment(N0),conventional fertilizer treatment(N),and three nitrogen fertilizer reduction gradients(N1,N2 and N3,which reduced nitrogen use by 10%,20%and 30%,respectively,compared with conventional fertilizer)were set up in a total of six treatments.Leaf nutrient content,net photosynthetic rate,chlorophyll fluorescence,chlorophyll content,leaf area index and yield were compared under different fertilizer application methods based on multi-year fertilizer trials.Nitrogen fertilization significantly increased leaf and branch nutrient content,leaf chlorophyll content,leaf area index,net photosynthetic rate,chlorophyll fluorescence and yield,and soluble solids and VC content in fruit.Nitrogen reduction of 10% had no significant effect on leaf and branch nutrient content,chlorophyll fluorescence,net photosynthetic rate,chlorophyll content,leaf area index and fruit soluble solids,VC,stone cells and total acid content compared to complete N application,and N reduction of 10% to 20% had no significant effect on the orchard yield and was able to maintain it at the normal range level.Net photosynthetic rate,chlorophyll fluorescence parameters,and yield were significantly and positively correlated with N,P,K,Fe,Mn,Cu,and Zn contents in leaves and branches.According to the experimental results and analysis,the recommended range of nitrogen fertilizer reduction for Korla fragrant pear of 10—12 years old is 10%—20%(240—270 kg/ha)on the basis of fully applied nitrogen(300 kg/ha)as the optimal amount of nitrogen fertilizer reduction in fragrant pear orchards.

Key words: Korla fragrant pear, Nitrogen reduction, Nutrient content, Chlorophyll fluorescence, Yield

ZHANG Xiyu, SHEN Xing, LI Wei, LI Jie, YAN Linsen, ZHANG Feng, CHAI Zhongping. Effect of Nitrogen Reduction Fertilization on Leaf Quality and Yield of Korla Fragrant Pear[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(2): 139-152. doi: 10.7668/hbnxb.20195447.

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Figures/Tables 19

Tab.1 Nitrogen fertilizer reduction pilot programme

处理 Treatment		肥料用量 Fertilizer rate
处理 Treatment		N/(kg/hm²)	P₂O₅/(kg/hm²)	K₂O/(kg/hm²)	N/(kg/株)	P₂O₅/(kg/株)	K₂O/(kg/株)
1	CK	0	0	0	0.000	0.000	0.000
2	N0	0	300	75	0.000	0.267	0.067
3	N	300	300	75	0.267	0.267	0.067
4	N1	270	300	75	0.240	0.267	0.067
5	N2	240	300	75	0.213	0.267	0.067
6	N3	210	300	75	0.187	0.267	0.067

Fig.1 Effect of reduced nitrogen fertilizer application on mass elements in newborn tip branches at fruit set stage Different lowercase letters indicate significant differences between different treatments at P<0.05 level.The same as Fig.2—11,14.

Fig.2 Effect of reduced nitrogen fertilizer application on mass elements in new shoots at the expansion stage

Fig.3 Effect of reduced nitrogen fertilization on micronutrients in new shoots at fruit set stage

Fig.4 Effect of reduced nitrogen fertilization on micronutrients in new shoots at fruit expansion stage

Fig.5 Effect of reduced nitrogen fertilization on mass elements in newborn tip leaves at fruit set stage

Fig.6 Effect of reduced nitrogen fertilizer application on mass elements in the leaves of new shoots at the expansion stage

Fig.7 Effect of reduced nitrogen fertilization on micronutrients in leaves of newborn tips at fruit set stage

Fig.8 Effect of reduced nitrogen fertilization on micronutrients in the leaves of new shoots at the expansion stage

Fig.9 Effect of nitrogen reduction fertilization on chlorophyll content

Fig.10 Effect of nitrogen reduction fertilization on leaf area index(LAI)

Fig.11 Effect of reduced nitrogen fertilizer application on net photosynthetic rate

Fig.12 Correlation between leaf nutrient content and net photosynthetic rate with reduced nitrogen fertilization ^**,^***indicates highly significant differences between treatments(P<0.01,P<0.001),respectively. The same as Fig.13,15—16.

Tab.2 Comparison of leaf fluorescence parameters under reduced nitrogen fertilizer treatments

处理 Treatment	光下最小荧光产量 Minimum fluorescence yield under light F0'	光下最大荧光产量 Maximum fluorescence yield under light Fm'	光下潜在活性 Potential activity under light Fv'/F0'	光下最大光能利用效率 Maximum light energy utilization efficiency under light Fv'/Fm'	实际原初光能捕获效率 Actual primary light energy capture efficiency Yield
CK	61.00±3.51e	344.00±10.69e	4.44±0.27b	0.822±0.015a	0.384±0.009c
N0	76.33±1.76d	435.67±8.09d	4.71±0.14ab	0.825±0.004a	0.403±0.010c
N	145.00±1.16a	780.33±6.69a	4.38±0.09b	0.814±0.002a	0.442±0.022b
N1	135.33±2.03b	756.67±2.33b	4.59±0.08ab	0.821±0.002a	0.534±0.010a
N2	130.33±1.86b	745.00±10.50bc	4.72±0.14ab	0.825±0.004a	0.471±0.007b
N3	121.33±2.60c	732.33±8.76c	5.04±0.06a	0.834±0.001a	0.452±0.008b

Fig.13 Correlation between leaf nutrient content and leaf fluorescence parameters of nitrogen reduction fertilization

Fig.14 The quality of fragrant pear treated with nitrogen fertilizer reduction

Tab.3 Effect of nitrogen fertilizer reduction on the yield of fragrant pear

处理 Treatment	单株果数/(个/株) Fruit number per plant	单果质量/g Single fruit weight	产量/(kg/hm²) Yield
CK	148.00±5.51c	100.97±4.70b	16 827.33±1 152.21c
N0	158.67±7.51c	101.98±2.03b	18 220.67±1 107.25c
N	231.00±7.81a	125.94±6.41a	32 715.00±1 876.74a
N1	216.67±7.54ab	126.53±7.02a	30 767.00±1 343.10a
N2	209.00±7.00bc	118.83±3.86a	27 977.33±1 687.40ab
N3	196.00±3.79b	111.30±2.98ab	24 564.33±1 099.63b

Fig.15 Nutrient content and yield correlation of nitrogen reduced fertilized branches

Fig.16 Correlation between leaf nutrient content and yield with reduced nitrogen fertilization

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