Effects Of Different Application Rates Of Nitrogen,Phosphorus And Potassium On Leaf And Fruit Quality Of Blue Honeysuckle (Lonicera Caerulea L.)

The amount of nitrogen,phosphorus and potassium fertilizer were applied to Blue Honeysuckle which directly affects the quality and yield of leaves and fruit.It is particularly important for the benign development of the Blue honeysuckle industry to study it accurately.This experiment was carried out in the Blue Honeysuckle Germplasm Resource Garden of Northeast Agricultural University from 2019 to 2020.The 6-year-old’wulan’was used as the experimental materials.There were 10 treatments in total.The nitrogen,phosphorus and potassium fertilizers were all increased by a 10g gradient and 0g/plant,10g/plant,20g/plant,30g/plant.studying the effects of different nitrogen,phosphorus,and potassium fertilizer application rates on the leaf and fruit quality of Blue Honeysuckle,Can help us to provide a scientific basis for the precise fertilization of Blue Honeysuckle.The main research results of this article are as follows:（1）The photosynthesis of the leaves of Blue honeysuckle with 20g nitrogen fertilizer was the best.The net photosynthetic rate,stomatal conductance,and transpiration rate were significantly higher than those of the control,which were 1.54,2.61,and 1.64 times higher,respectively.The chlorophyll content and leaf area of the leaves have increased to vary degrees,chlorophyll a,chlorophyll b,carotenoids increased by 14.82%,22.14%,and 28.51%compared with the control;the maximum leaf area is 29.42cm²,an increase of 70.55%;Fruit size,single fruit weight,hardness increased by 25.19%,14.72%,33.57%,38.46%compared with the control;the titratable acid content of the fruit was significantly reduced by 20.68%compared with the control;total anthocyanins,flavonoids,The total phenol content reached the maximum value of 137.09mg/100g,47.56mg/100g,16.15mg/g,which were 1.41,1.2,1.42 times of the control;increase the content of manganese and sodium,which were increased by 12.19%and 34.19%compared with the control;The maximum soluble solid content of fruit under nitrogen fertilizer 10g/plant treatment was16.86%,which was 1.09 times higher than that of the control;the ascorbic acid content was significantly higher than that of the control,which was 166.75mg/100g,which was 1.58 times higher than that of the control;three The content of calcium,magnesium,zinc and iron under nitrogen fertilizer treatment was slightly lower than that of the control.（2）The best photosynthesis with 20g/plant of phosphate fertilizer Blue honeysuckle leaves,the net photosynthetic rate,stomatal conductance and transpiration rate are 10.96μmol·m²·s^-1,10.42mmol·m-²·s^-1,respectively,6.69 mmol·m^-2·s^-1,1.51,2.33 and 1.64 times of the control.The chlorophyll content and leaf area of the 20g/plant phosphate fertilizer plant leaves had significant effects.The chlorophyll a,chlorophyll b,and carotenoids increased by 36.75%,82.97%,and31.5%respectively;the leaf area of 28.25cm² increased by 62.6%compared with the control.The size of furit 11.62mm and 23.28mm,the maximum single fruit weight is 1.83g,and the hardness is0.48pa,compared with the control Increased by 29.54%,14.28%,33.57%,and 23.07%;the content of titratable acid,total anthocyanins,flavonoids,ascorbic acid,total phenol,etc.of the fruits all reached the highest levels,which were 1.65,1.47,1.25,1.35,1.16 times.The contents of copper and manganese of the phosphate fertilizer 20g/plant fruit reached the maximum,which were increased by 25.8%and 36.58%compared with the control.Phosphate fertilizer has no effect on the content of zinc,sodium and magnesium in the fruit but it will reduces the content of calcium and iron in the fruit.（3）The effects of net photosynthesis rate,stomatal conductance,and transpiration rate in photosynthesis of potassium fertilizer 30g/plant leaves reached the best,which were control 1.64,2.27,1.72 times;the application rate of 30g/plant of potassium fertilizer also has an effect on the chlorophyll content and leaf area of the leaves.Chlorophyll a and chlorophyll b reach the maximum value,which is increased by 10.85%and 34.29%compared with the control;the highest ratio of potassium fertilizer 20g/plant carotenoid content The control increased by 47.94%,and the maximum potassium fertilizer 30g/leaf area was 33.82cm²,an increase of 96.11%over the control.The application of potassium fertilizer 30g/plant increased the size,weight and hardness of the fruit,which were increased by 24.08%,9.37%,35.03%and 23.07%respectively compared with the control;the total anthocyanin,flavonoids and total phenol in the fruit were all equal The highest reached 120.09mg/100g,53.52mg/100g,13.66mg/100g,compared with the control increased 23.99%,35.04%,20.77%The content of medium titratable acid was the lowest,which was 1.07 times lower than that of the control;the contents of copper and manganese in the fruit were significantly higher than that of the control,increasing by 25.8%and 46.34%respectively.The content of soluble solids in 10g/plant of potassium fertilizer was 1.04 times that of the control.The application of potassium fertilizer has little effect on the content of iron,sodium and zinc in the fruit,but it will reduce the content of calcium in the fruit.（4）In summary,the application of nitrogen fertilizer 20g/plant or phosphate fertilizer20g/plant or potash fertilizer 30g/plant can enhance the leaf photosynthesis and improve fruit quality of Blue honeysuckle.