Effects Of Foliar Nutrition On Yield,quality And Nutrient Utilization Of Hongmeiren Citrus

Citrus is the most important economic crop in China.Citrus has the characteristics of high yield and high nutrient output,and the lack of medium and micro elements restricted the improvement of fruit quality due to unbalanced fertilization.The special fertilizer demand characteristics and industrial characteristics of Hongmeiren cause the poor nutritional supply of Hongmeiren citrus trees,which affects the yield and quality of Hongmeiren.Therefore,in this study,the effect of foliar nutrition on the yield and quality of the fruit and its influence on nutrient absorption and utilization.The main results of this study are as follows:(1)Spraying medium and micro foliar nutrition can improve the yield of Hongmeiren citrus.Foliage spraying with B,Zn,Mo and Mg coordination increased the yield of Hongmeiren citrus fruit in different degrees,and the fruit yield of Hongmeiren citrus was increased by increasing the number of fruit set.The highest yield was obtained by combined spraying with boron,zinc,molybdenum and magnesium for 3 times(T3);In the treatment of B,Zn,Mo and Mg foliar spraying alone,the yield of Zn,Mo and Mg treatments increased by 10.10%,40.38% and 16.55%,respectively.(2)Foliage spraying with B,Zn,Mo and Mg coordination significantly improved the fruit quality of Hongmeiren citrus.All the treatments improved the Vc content,soluble solids and juice yield of Hongmeiren citrus,and also improved the other qualities to different degrees.Among them,the combination of B,Zn,Mo and Mg and the addition of ZNC and urea(T4,T5)treatment significantly increased the Vc content and soluble solids of citrus.(3)Spraying medium and micro foliar nutrients can improve the nitrogen and phosphorus nutrient utilization efficiency of Hongmeiren citrus.In the treatment of B,Zn,Mo and Mg coordination with foliar spraying,spraying fertilizer Ⅰ and Ⅱ in spring shoot stage could significantly reduce leaf N content in June,while spraying fertilizer Ⅲsignificantly increased leaf N content in June.In addition,the contents of P and K in leaves of each treatment also decreased to varying degrees in June,and then increased in August.In the single foliar spraying treatment of boron,zinc,molybdenum and magnesium,Mo,Mg and H spraying in June increased the content of nitrogen and phosphorus in leaves in August,and the content of nitrogen in leaves increased significantly.(4)Spraying medium and micro foliar nutrition can increase the content of micro elements in the leaves and fruits of Hongmeiren citrus.The contents of boron,molybdenum,zinc and magnesium in leaves and fruits were significantly increased in the treatment of B,Zn,Mo and Mg coordination with foliar spraying.Foliar spraying of boron,zinc,molybdenum and magnesium alone significantly increased the content of corresponding medium and micro elements in leaves and fruits.Also affected the absorption and utilization of other micro elements.For example,Mo and Mg treatments significantly increased the content of boron in leaves and zinc content in fruits in August.