Five age groups of trees were carried out in order to study relationships between the deterioration of Ponkan mandarin fruit quality and changes in tissues nutrient concentrations with tree age.Fruit quality and nutri...Five age groups of trees were carried out in order to study relationships between the deterioration of Ponkan mandarin fruit quality and changes in tissues nutrient concentrations with tree age.Fruit quality and nutrient concentrations in fruits and leaves were measured.Comprehensive fruit quality decreased in the order:5-year-old > 13-year-old > 38-year-old > 8-year-old >18-year-old.In 18-year-old trees,calcium(Ca) concentrations of fruit and leaf were lower,while potassium(K) and boron(B) concentrations of fruit and magnesium(Mg) and manganese(Mn) concentrations of leaf were higher.Negative relationships were observed between fruit total soluble solids and leaf B,while positive relationships were observed between fruit total soluble solids and leaf and fruit Ca concentrations,and between titratable acidity and leaf Mn.Fruit quality decreasing with tree age most likely resulted from an imbalance of high K,Mg and B but lower Ca concentrations in leaves and fruits.展开更多
We investigated the correlation between leaf/soil minerals and fruit quality in apple trees grown in orchards,with the ultimate goal of improving the latter.Leaf mineral nutrients;soil nutrients in the 0-20,20-40,and ...We investigated the correlation between leaf/soil minerals and fruit quality in apple trees grown in orchards,with the ultimate goal of improving the latter.Leaf mineral nutrients;soil nutrients in the 0-20,20-40,and 40-60 cm layers;and fruit quality traits in 32 apple orchards in China were monitored for 2 years.Significant factors associated with fruit quality were identified via correlation analysis.An analysis of leaf data revealed that leaf nitrogen（N） and leaf magnesium（Mg） levels were extremely high in 75 and 89%of the orchards,respectively.In the Bohai Gulf region,94%of the orchards showed significantly higher values than the standard.The soil pH values of the orchards in eastern China like eastern Shandong or Liaoning were lower than 7.0,while the pH values in the Loess Plateau of northwestern China like Shaanxi were much higher than 7.Soil alkali-hydrolyzable N levels in 47%of the orchards were lower than the optimal level of 70 mg kg^-1.Generally,the soil alkali-hydrolyzable N levels of orchards in the Bohai Gulf region were significantly higher than those in the Loess Plateau region.The available P levels in the orchards of the Bohai Gulf region were up to three times higher than those of the Loess Plateau region.However,although the available potassium（K） in most orchards was sufficient（51.39-309.94 mg kg^-1）,leaf K content in 73%of the orchards was low,possibly due to fruit bagging or fruit overload.Approximately 63%of the orchards in Shandong and 29%of the orchards in Shannxi showed leaf Fe deficiencies.In the Loess Plateau,most orchards showed high leaf Ca levels,a strong correlation was observed between leaf and soil phosphorus/potassium（P/K）content and fruit organic acid content.The amounts of fruit soluble sugar or fructose were positively correlated with soil calcium/potassium（Ca/K） levels and leaf calcium/boron（Ca/B） levels in most orchards.The excessive leaf N levels caused by the extensive application of N fertilizers had a negative effect on fruit quality in most apple orchards in China.P,K,Ca,and B were key minerals associated with fruit quality.展开更多
基金Supported by the Earmarked Fund for the Modern Agro-industry Technology Research System(CARS-27)
文摘Five age groups of trees were carried out in order to study relationships between the deterioration of Ponkan mandarin fruit quality and changes in tissues nutrient concentrations with tree age.Fruit quality and nutrient concentrations in fruits and leaves were measured.Comprehensive fruit quality decreased in the order:5-year-old > 13-year-old > 38-year-old > 8-year-old >18-year-old.In 18-year-old trees,calcium(Ca) concentrations of fruit and leaf were lower,while potassium(K) and boron(B) concentrations of fruit and magnesium(Mg) and manganese(Mn) concentrations of leaf were higher.Negative relationships were observed between fruit total soluble solids and leaf B,while positive relationships were observed between fruit total soluble solids and leaf and fruit Ca concentrations,and between titratable acidity and leaf Mn.Fruit quality decreasing with tree age most likely resulted from an imbalance of high K,Mg and B but lower Ca concentrations in leaves and fruits.
基金financially supported by the 973 Progam of China(2011CB100602)the Special Fund forAgroscientific Research in the Public Interest,China(200903044)Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(Nutrition and Physiology),Ministry of Agricultural,China
文摘We investigated the correlation between leaf/soil minerals and fruit quality in apple trees grown in orchards,with the ultimate goal of improving the latter.Leaf mineral nutrients;soil nutrients in the 0-20,20-40,and 40-60 cm layers;and fruit quality traits in 32 apple orchards in China were monitored for 2 years.Significant factors associated with fruit quality were identified via correlation analysis.An analysis of leaf data revealed that leaf nitrogen（N） and leaf magnesium（Mg） levels were extremely high in 75 and 89%of the orchards,respectively.In the Bohai Gulf region,94%of the orchards showed significantly higher values than the standard.The soil pH values of the orchards in eastern China like eastern Shandong or Liaoning were lower than 7.0,while the pH values in the Loess Plateau of northwestern China like Shaanxi were much higher than 7.Soil alkali-hydrolyzable N levels in 47%of the orchards were lower than the optimal level of 70 mg kg^-1.Generally,the soil alkali-hydrolyzable N levels of orchards in the Bohai Gulf region were significantly higher than those in the Loess Plateau region.The available P levels in the orchards of the Bohai Gulf region were up to three times higher than those of the Loess Plateau region.However,although the available potassium（K） in most orchards was sufficient（51.39-309.94 mg kg^-1）,leaf K content in 73%of the orchards was low,possibly due to fruit bagging or fruit overload.Approximately 63%of the orchards in Shandong and 29%of the orchards in Shannxi showed leaf Fe deficiencies.In the Loess Plateau,most orchards showed high leaf Ca levels,a strong correlation was observed between leaf and soil phosphorus/potassium（P/K）content and fruit organic acid content.The amounts of fruit soluble sugar or fructose were positively correlated with soil calcium/potassium（Ca/K） levels and leaf calcium/boron（Ca/B） levels in most orchards.The excessive leaf N levels caused by the extensive application of N fertilizers had a negative effect on fruit quality in most apple orchards in China.P,K,Ca,and B were key minerals associated with fruit quality.
