Effects of Combined Application of Organic-Inorganic Fertilizer on Soil and Leaf Nutrients in Walnut Orchards in Xinjiang
[Objective]The effects of combined application of organic-inorganic fertilizer on soil and leaf nu-trients in walnut orchards were studied,and the main soil chemical factors affecting leaf nutrients were screened,which provides scientific evidence for the efficient management of soil nutrient resources in wal-nut orchards in Xinjiang.[Method]Based on the 10-year-old walnut'Wen 185'(Juglans regia)at walnut main planting areas in Yecheng County,Kashgar,Xinjiang,a single factor completely random plot design was adopted to explore the chemical properties of soil and leaf mineral elements changes of walnut orch-ard under organic-inorganic compound fertilizer(Mineral source potassium fulvic acid and medium ele-ment water-soluble fertilizer,YZ)with the local conventional fertilization(Diammonium hydrogen phos-phate and potassium sulfate,YD).[Results]Compared to YD fertilization measure,YZ treatment signific-antly reduced soil pH and salt ion content,and increased leaf mineral element content,but there were sea-sonal differences.In May,the contents of soil NO3--N,AK and leaves N,K and Zn(460.22%,46.46%,12.16%,17.46%,21.88%,p<0.05)increased significantly under YZ treatment.However,in July,the con-tents of soil pH,EC,Cl--S,NH4+-N,AP,Na+ and leaf Cl--L(2.21%,27.25%,23.37%,61.09%,30.03%,13.24%,15.94%,p<0.05)significantly reduced.The content of N,P,Ca,Mg,Na,Fe,Mn and B elements in the leaves increased significantly(4.16%,13.25%,20.73%,44.04%,66.67%,24.62%,52.47%,31.85%,p<0.05).In September,the soil EC,NH4+-N,AP and Na+(20.45%,37.31%,21.74%,11.36%,p<0.05)re-duced significantly under YZ treatment,while the contents of OM,NO3--N and AK were significantly higher than those under YD treatment(22.17%,59.09%,56.47%,p<0.05).The results of linear regression analys-is showed that soil pH,Na+ and Cl--S were the important soil chemical factors affecting the content of min-eral elements in walnut leaves at walnut orchards in Xinjiang.Increasing the application of organic fertil-izer and reducing soil pH were beneficial to the accumulation of N,P,K,Na,Fe,Zn elements in walnut leaves.[Conclusion]The YD treatment increases the salt ion content of soil EC,Na+,Cl--S,NH4+-N,etc.,and long-term application may aggravate the level of soil salinization in walnut orchards in Xinjiang.YZ treatment can significantly reduce soil pH,Na+,EC,NH4+-N and other salt ion content,and improve the content of mineral elements such as N,P,K,Fe and other mineral elements.It is recommended that in walnut orchards in the main walnut planting area of Xinjiang,the combined application of organic-inorgan-ic fertilizer can reduce the level of soil salinization to reduce the harm of salinity before July.In addition,balancing the mineral element content of leaves,and avoiding long-term single application of chemical fer-tilizer as much as possible will be helpful for soil.
walnut orchardsorganic-inorganic fertilizer combinationchemical properties of soilleaf mineral nutritionsaline-alkali land
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