Analysis Of Nutrient Contents In Leaves And Soil Of Yellows Peach Orchard In Sanyuan And Jingyang,Shaanxi

The peach is an important fruit tree in North China,Shaanxi province is one of the main producing area of peach production in China,and Sanyuan and Jingyang County in Shaanxi province is the peach production areas,many farmers in planting peach and peach production as the main source of income.With the increase of planting age orchards and trace elements fertilizer deficiency,from the beginning of the July orchard appeared in leaf yellowing phenomenon,affect the further improve the yield and quality of peach.In this study,through on-the-spot investigation and analysis of nutrition on the incidence of orchard leaves and soil,leaf and soil nutrient contents in Shaanxi Sanyuan,Jingyang peach orchards with Leaf chlorosis,explore the reasons of Leaf chlorosis for this area of peach orchard,provide a basis for rational fertilization in peach orchard.The test is carried out through the analysis of nutrient content of 5 chlorisis and 5 normal peach orchards leaves and soil,study the key factors of influencing the peach leaves with chlorisis.The results are as follows:1.Through the analysis of leaf nutrition on chlorosis and normal peach orchards,the content of N,P,K,Cl in leaf in chlorosis peach orchards were higher,there was antagonism between P and Mg,K and Fe,Ca and Cl,the content of P?K and Cl influence the absorption of plants to Fe and Ca,caused by Magnesium deficiency,iron deficiency and calcium deficiency chlorosis.The symptoms of Mg deficiency are mainly in older leaves,so defining the primary result of Leaf Chlorosis is iron deficiency and calcium deficiency.2.Through the analysis of soil nutrition on the chlorosis and normal peach orchards,that is significantly lower than that of normal peach orchards organic matter content in soil,the average value of pH was normal in 7.1 ~ 8.1 in soil of chlorosis and normal peach orchards,the area of soil pH are not suitable for peach tree growth environment in alkaline soil,and The same is basically the same between pH.In chlorosis and normal peach orchards soil,nitrogen,available phosphorus,available potassium and water-soluble calcium,Fe and chloride content were 0 ~ 20 cm soil layer was significantly higher than that of 20 ~ 40 cm soil layer,and the exchange of magnesium content is moderate;In addition,the soil layer of 0 ~ 40 cm in the Chlorosis peach orchards,alkali hydrolyzable nitrogen and available phosphorus content,chloride,and water soluble calcium,water soluble magnesium,available iron content is low,that has great influence on soil fertilization unreasonable and irrigation of peach orchards etiolated leaves.3.Based on the cultural background,leaves and soil nutrient status were analyzed,summarized and proposed the future areas of peach orchards fertilization,organic manure should be applied,to reduce the amount of nitrogen and phosphorus fertilizer,and to improve the fertilization methods and improve irrigation and soil water status.In addition,should pay attention to the reasonable application of calcium,magnesium and iron fertilizer,thus to achieve the purpose of reasonable and optimized fertilization.