不同栽培模式下氨基酸与KH2PO4复配对切花月季产量和品质的影响OA

[Objective]The study investigated the effects of combined application of amino acids and different concentrations of KH2 PO4 on physiological characteristics,yield,and quality of cut roses under various cultivation modes.[Method]The rose cultivar'Sweetheart Story'was used as the experimental material,and three cultivation systems were established:substrate cultivation(T1),bio-organic fertilizer soil im-provement cultivation(T2),and conventional soil cultivation(T3).Under each cultivation mode,five treatments were established:CK1(wa-ter spraying),CK2(600×diluted amino acid foliar fertilizer),A(CK2+1 g/LKH2 PO4),B(CK2+0.67 g/LKH2 PO4),and C(CK2+0.5 g/L KH2 PO4).The agronomic traits(such as plant height,stem diameter and number of leaves),physiological and plant nutrient indi-cators of roses,as well as the yield and quality of roses were determined.Correlation analysis and principal component analysis were employed to comprehensively evaluate the impact of amino acid-KH2 PO4 compound application on cut rose performance under different cultivation modes.[Result]A significant influence of cultivation mode and foliar fertilization strategies was observed regarding the growth,yield and quality of roses.Across all treatments,the T2 and T1 regimes consistently outperformed the T3 mode.Notably,the T2A treatment increased to-tal chlorophyll content by 44.14%and 57.23%compared to T1A and T3A,respectively,while the T1CK2 treatment reduced malondialde-hyde(MDA)levels by 53.24%compared to T1CK1.For most indicators,foliar fertilization proved superior to the water control within the same cultivation framework.Furthermore,the combined application of amino acids and KH2 PO4 generally yielded better outcomes than the singular application of amino acids.Significantly,the T2A treatment demonstrated optimal performance across critical parameters,including antioxidant enzyme activity,leaf nutrient accumulation,plant height,stem diameter,flower count per plant and flower diameter.It also exhibi-ted markedly a greater proportion of grade A flowers than any other treatment;specifically,the grade A flower ratio under T2A surpassed that of T2B by 44.55%and T1A by 44.68%.Correlation analysis revealed that yield was significantly and positively correlated with plant height,stem diameter,SPAD values,and the activity of POD and SOD,while exhibiting a highly significant negative correlation with MDA.In terms of overall comprehensive ranking,the top five treatments were ordered as follows:T2A>T2B>T1B>T1A>T2CK2.[Conclusion]Compared with conventional soil culture(T3),both improved soil culture(T2)and substrate culture(T1)can promote rose growth and in-crease the yield and quality of cut roses.Under the three cultivation modes,the combined application of amino acid foliar fertilizer and KH2 PO4 has a better effect than single amino acid spraying,and both are superior to the clear water control(CK1).Among them,although substrate culture has the above-mentioned synergistic effect,its technology and cultivation cost is higher than those of improved soil culture,and its comprehensive effect is not as good as that of the combined treatment of 600-fold amino acid(CK2)and1 g/L KH2 PO4(T2A)under the improved soil culture mode.Therefore,T2A is the optimal combination scheme of cultivation mode and foliar fertilizer for increasing yield and improving quality of cut roses.