聚氨酸叶面肥对黄瓜生长及果实品质的影响OA

To explore the regulatory effects of polyamino acid foliar fertilizer on cucumber growth and screen its optimal field application concentration,pot experiments using cucumber seedlings and field cultivation trials were carried out with a series of dilution gradients of polyamino acid foliar fertilizer(600-fold,800-fold,1 000-fold,1 200-fold and 1 500-fold dilutions).The results indicated that polyamino acid foliar fertilizer significantly promoted the vegetative growth(roots,stems and leaves)and biomass accumulation of cucumber seedlings in the pot experiment,and effectively enhanced root activity and leaf photosynthetic capacity.Among all tested treatments,the 1200-fold dilution treatment exerted the best regulatory effect,which produced the maximum seedling plant height,stem diameter,root length,root activity,fresh weight and dry weight at 22.88 cm,4.03 mm,25.36 cm,1.23 mg·g-1·h-1,3.84 g and 0.21 g respectively.These four indexes were significantly increased by 38.4%,44.4%,49.7%,68.5%,23.5%and 50.0%compared with the clear water control(CK),respectively.Moreover,this treatment also obtained the highest leaf net photosynthetic rate,stomatal conductance and water use efficiency across all groups.In the field trial,foliar application of 1 200-fold diluted polyamino acid fertilizer significantly increased cucumber plant height and stem diameter.The single fruit weight and yield per plant reached 127.79 g and 1.52 kg,representing significant increments of 26.3%and 10.1%relative to the CK.In addition,internal fruit quality was greatly optimized.Compared with CK,contents of soluble sugar,vitamin C and crude protein increased significantly by 24.4%,25.5%and 48.6%,while nitrate-nitrogen content declined significantly by 23.1%.In summary,foliar spraying polyamino acid foliar fertilizer at a 1 200-fold dilution can remarkably facilitate cucumber growth and development,and simultaneously improve fruit yield and nutritional quality.