Effect Of Different Proportion Of Polyhaite Replacing Potassium Fertilizer On Cherry Yield,Quality And Soil Properties

Fertilizer plays an important role in the growth of fruit trees and the improvement of fruit quality.China is a major agricultural country in the world,and one of the major potash consumption countries in the world.Agricultural production requires a large amount of potash fertilizer.However,soluble potash resources in China are very short,a large number of imports was required from abroad,greatly increasing production costs.In order to make China’s potash fertilizer resources not subject to other countries,improve China’s self-sufficiency rate of potash fertilizer and promote the sustainable development of China’s potash fertilizer industry,the key is to focus on the exploitation of potash resources.In recent years,polyhalite has been coming into people’s eyes.People have gradually begun to mine polyhalite ore and carry out simple process extraction for agricultural production,which has achieved good results.Polyhalite is a mineral rich in K,Ca,Mg,S and other elements,and its reserves in China are also considerable,and polyhalite has higher commercial value with higher utilization value compared with other insoluble potassium resources.If it can be used in a large scale,it will greatly reduce the production cost In this study,polyhalite and cherry“Meizao”was taken as the experimental object.Two modes of fertilization in the study was arranged,that was:farmers’conventional fertilization and recommended fertilization.Under the condition of the same amount of fertilization,the effect of different proportions of K₂SO₄replaced by polyhalite on cherry fruit and soil fertility was studied.The experiment set up two fertilization modes of farmers’customary fertilization and recommended fertilization,a total of eight treatments.The main findings are as follows:1.When K₂SO₄was replaced by polyhalite in different proportions for fertilization,soil p H and EC value were reduced,and the reduction was within the scope of cherry tree growth,which indicates that polyhalite replaces K₂SO₄can alleviate soil salinization.The contents of total N,alkali-hydrolyzable N,available P,available K,organic matter,urease and phosphatase in the soil increased when K₂SO₄was replaced by polyhalite in different proportions,which showed that soil nutrient status and soil fertility were improved by application of polyhalite.2.When K₂SO₄was replaced by polyhalite in different proportions for fertilization,contents of chlorophyll,N,P and K in leaves increased,which indicated that polyhalite can release more nutrients for cherry trees and promote the growth of cherry trees.3.When K₂SO₄was replaced by polyhalite in different proportions for fertilization,the total acid content of cherry fruit decreased,and the contents of soluble solid,vitamin C,and reducing sugar increased.4.When K₂SO₄was replaced by polyhalite in different proportions for fertilization,the yield of cherry fruit and the appearance size of cherry fruit increased,which indicated that the taste and quality of cherry fruits was improved and the yield was increased when part of K₂SO₄was replaced by polyhalite.5.The effects of different treatments on soil fertility,leaf nutrient and fruit quality of polyhalite replacing K₂SO₄in different proportions are as follows:SOP-28>SOP-50>SOP at germination.