Nutrient Status Of Soil And Leaves In Majia Pummelo And Recommendation Fertilization

There are many factors affecting the fruit quality of Guangfeng Majia Pummelo,among which the decrease of soil fertility level and the imbalance of tree nutrients caused by long-term unscientific and reasonable fertilization are two of the important factors.Ma’s Pummelo fruit quality in order to promote Guang Feng ascension as well as the sustainable development of industry,with Jiang Xi Guang Feng zone 21 villages and towns have representative horse home Pummelo orchard planting as test object,taking soil,leaf and fruit samples were analyzed,and a preliminary set Guang Feng ma mineral nutrient content standard of Pummelo leaves,plant nutrition in clear Guang Feng horse home Pummelo obstacle factors basis,Based on the nutrient content of soil,tree body and fertilizer requirement of Majia Pummelo,and aiming at the optimal fruit quality,a recommended fertilization program for Majia Pummelo was proposed.The main results are as follows:1.Soil nutrients of Ma Jia orchard in Guangfeng District:The pH value of Ma Jia orchard in Guangfeng District ranged from 4.27 to 8.25,with an average value of 5.82.The acidic soil which was not suitable for the growth of Ma Jia accounted for 21.19%（pH<4.8）,and the acidic soil which was suitable for the growth of Ma Jia accounted for63.56%（pH 4.8-6.5）.The alkaline soil suitable for the growth of Ma Jia was 15.25%（pH6.6-8.5）.The mean value of soil organic matter was 23.97g/kg,50.85%higher than15g/kg,which was basically suitable for the growth of Ma Jia.Soil alkali-hydrolyzable N and available Mn contents were generally low,with the average values of 120.86 mg/kg and 64.25 mg/kg,respectively,and the deficiency and extremely deficiency accounted for75%and 78%,respectively.The soil available P,available K and available Zn were suitable for the growth of Ma Jia,with the average values of 14.75mg/kg,183.89 mg/kg and 1.91 mg/kg,respectively.The content of available Fe in the soil was excessive,with an average of 46.22mg/kg.There were great regional differences in exchangeable Ca,exchangeable Mg and available Cu.The proportion of soil with proper amount of Ma Jia growing accounted for 25.42%,27.73%and 33.05%,respectively.2.The optimum mineral nutrient content standards of Guangfeng Ma Jia leaves were preliminarily determined as follows:N:2.37%-2.74%,P:0.14%-0.19%,K:0.89%to1.30%,Ca:2.81 mg/kg-3.68 mg/kg,Mg:0.26 mg/kg-0.39 mg/kg,Fe:59.28 mg/kg-99.85mg/kg,Mn:38.81 mg/kg-86.34mg/kg,Cu:7.62 mg/kg-11.91 mg/kg,Zn:8.00 mg/kg-26.62 mg/kg,B:29.63 mg/kg-60.80 mg/kg.In leaves of Guangfeng Ma Jia,the contents of mineral elements such as N,P and K were sufficient（moderate amount,high amount and excessive amount）,accounting for 74.79%,73.11%and 63.87%.The leaves of N,P,K,Fe,Mn and Zn were at the appropriate level,Ca was generally too high,and the proportion of Mg,Cu and B was close to that of deficiency.Nutrient imbalance is obvious.3.The nutrient contents of mineral elements N,P and K were 1.00%,0.15%and1.45%,and the nutrient contents of N,P₂O₅and K₂O were 2.19 kg/t,0.76 kg/t and 3.85kg/t.The recommended dosage of nitrogen,phosphorus and potassium for Guangfeng Majia pommelo was determined to be N:148.92-248.20 kg/hm²,P₂O₅:91.63-144.58kg/hm²,K₂O:181.71-254.98 kg/hm².4.This experiment compared the fruit quality of Ma Jia after AF,BF,CF and XG fertilization treatments.The results showed that AF treatment could significantly improve the fruit quality of Ma Jia,AF,BF and CF treatments all achieved yield increase effect,and CF treatment had the best yield increase effect.Compared with XG,AF,BF and CF treatments were recommended to increase fruit yield by 13.10%,25.47%and 27.44%,respectively.The yield of Ma Jia under CF treatment was up to 51.74kg/plant.Compared with XG,CF,AF and BF treatments were recommended to increase fruit weight by 4.97%,1.86%and 1.86%.Compared with customary（XG）fertilization,the edible rate,juice yield,soluble solid content,titratable acid content and solid acid ratio of Ma Jia fruits under AF treatment were increased by1.61%,4.08%,3.11%,1.89%and 1.5%respectively.The titratable acid content of fruits increased by 7.55%after BF fertilization.The edible rate,solid and 1 solid acid ratio of Ma Jia under CF fertilization decreased by 1.61%,1.20%and 2.85%,respectively,while juice yield and titratable acid increased by 4.08%and 1.89%.