Effects of compound amino acid-iron fertilizer on fruit quality of kiwi fruit | 喷施复合氨基酸铁肥对猕猴桃果实品质的影响

Chinese. 研究喷施复合氨基酸铁肥对猕猴桃叶片铁含量及果实品质和产量的影响，筛选用于猕猴桃缺铁黄化病防治及果实品质提高的复合氨基酸铁肥的最佳喷施浓度。以黄化程度为4级，树龄5年的“秦美”猕猴桃为供试品种，采用田间试验，以喷施清水为对照，测定猕猴桃叶片中的铁含量、猕猴桃产量和果实中的还原糖、可滴定酸、维生素C、铁含量，研究喷施不同浓度复合氨基酸铁肥（分别稀释1 500，1 000，500倍）对石灰性土壤条件下猕猴桃果实品质的影响。与对照相比，喷施不同浓度复合氨基酸铁肥均可显著提高缺铁黄化猕猴桃叶片的铁含量。在一定喷施浓度范围内，猕猴桃果实中的可溶性固形物、还原糖、维生素C含量及糖酸比随着复合氨基酸铁肥喷施浓度的增加呈先增加后降低的趋势，可滴定酸含量随着复合氨基酸铁肥喷施浓度的增加呈先降低后增加的趋势，其中喷施稀释1 000倍复合氨基酸铁肥时果实的维生素C、可溶性固形物、还原糖含量最高，可滴定酸含量最低，风味最佳；而喷施稀释500倍复合氨基酸铁肥的果实铁含量最高。与对照相比，喷施复合氨基酸铁肥对猕猴桃产量的影响不明显。综合考虑作用效果，稀释1 000倍是石灰性土壤条件下改善猕猴桃品质的最佳复合氨基酸铁肥的使用浓度。

English. The effect of compound amino acid-Iron Fertilizer on iron content of kiwi fruit leaves, fruit quality and yield was investigated to screen the best spraying concentration of compound amino acid-Iron Complex Fertilizer which can be used in the fruit quality enhancement and the prevention and treatment of chlorosis. 5-year-old ‘Qinmei’ kiwifruit was used as test cultivar and the group which was sprayed clear water was used as control. Field experiment was conducted to study the effects of different concentrations of Compound amino acid-Iron Fertilizer (diluted 1 500, 1 000, 500 times) on kiwi fruit quality by determining the iron content of kiwi fruit leaves as well as the content of reducing sugar, titratable acid, vitamin C and iron in kiwi fruit and fruit yield in calcareous soil. The results showed that spraying different concentrations of compound amino acid-iron fertilizer could significantly increase the iron content of etiolated kiwifruit leaves. Titratable acid in fruit first increased and then decreased with the increase of the concentration of compound amino acid-iron fertilizer. When compound amino acid-iron fertilizer (diluted 1 000 times) was sprayed, the fruit content of vitamin C, soluble solids and reducing sugar were the highest, the flavor was the best and the titratable acid was the lowest; When compound amino acid-iron fertilizer (diluted 500 times) was sprayed, the fruit iron content could be best increased. Compared with the control, spraying compound amino acid-iron fertilizer had no obvious effect on fruit yield. Considering the effects, the best concentration is 1 000 times of the compound amino acid-iron fertilizer on kiwi fruit quality under calcareous soil conditions.