Soil Fertility Characteristics And Expert System Establishment Of Bingtang Orange Orchard In Yongxing

The Bingtang orange industry is an important enriching industry in Yongxing County.Today's extensive management and abuse of chemical fertilizers have led to a decline in soil fertility,which has constrained the development of the Bingtang orange industry.To this end,the soil nutrient characteristics,leaf and fruit nutrition and fruit quality of Bingtang orange orchard were studied.Combined with ARCGIS,county soil testing formula fertilization expert system and other software,the expert system of Bingtang orange soil testing formula fertilization was established.The main research results are as follows:(1)An analysis of the seven soil fertility quality indicators for orchard soils showed that the soil fertility was moderate and the soil was acidic.The soil comprehensive fertility in the three regions of the orchard is moderately lower,and the comprehensive fertility of the orchard in the central region is higher than that in the northern and southern orchards.(2)There was a certain correlation between nutrients in citrus soil and nutrient elements in citrus leaves.There was a significant positive correlation between soil organic matter and magnesium in leaves of Yongxing County,and there was a significant positive correlation between soil p H and calcium in leaves.There was a significant positive correlation between phosphorus in soil and a significant positive correlation with zinc.There was a significant positive correlation between iron in leaves and sulfur in soil.Zinc in leaves was significantly negatively correlated with potassium in soil.(3)The nutrient content of the leaves is more responsive to the nutrient requirements of the fruit quality.There was a significant negative correlation between leaf iron content and fruit weight and titratable acid,and a significant positive correlation with solid acid ratio.There was a significant negative correlation between phosphorus content and fruit edible rate,and leaf calcium was positively correlated with titratable acid.There was a significant negative correlation with soluble solids and fruit Vc content,and there was a significant positive correlation between leaf nitrogen and soluble solids and fruit Vc content.(4)The nutrient content of the soil has a certain influence on the fruit quality.The titratable acid was positively correlated with potassium,calcium and magnesium in the soil,and negatively correlated with sulfur.The soluble solids in the fruit were significantly positively correlated with soil organic matter,and the solid-acid ratio in fruits and potassium in soil.There was a significant negative correlation between the elements,and the Vc content in the fruit was significantly positively correlated with soil organic matter.(5)The relationship between effective nutrient content and fruit quality was more direct.There was a significant positive correlation between potassium content and fruit weight per fruit.There was a significant positive correlation between fruit calcium and fruit edible rate,compared with soluble solids and solid acid.The Vc content was significantly negatively correlated.The copper content of fruit was significantly negatively correlated with the edible rate of fruit,and it was significantly positively correlated with the solid-acid ratio.The phosphorus content of fruit was significantly negatively correlated with soluble solids and Vc content.(6)Based on the soil testing formula fertilization expert system,combined with the actual conditions of Yongxing County Orchard and expert guidance,the formula of the Bingtang orange formula is 15:10:15,17:8:20,18:10:12,20:8: 12,established the Bingtang orange soil testing formula fertilization expert system.