Effects of Phosphate Rock Powder with Organic Fertilizer on the Growth Characteristics and Nutritional Quality of Alfalfa
Three grades of phosphate rock powder,including PRⅠ(containing P2O5 18%),PRⅡ(containing P2O5 28%)and PRⅢ(containing P2O5 38%)were applied with organic fertilizer to four alfalfa varieties:Gannong No.9(M1),Glod queen(M2),Giant energy No.2(M3),Zhongmu No.1(M4),using a soil pot cultivation method.The water-soluble phosphorus fertilizer,calcium superphosphate(CK1),and no phosphorus fertilizer(CK2)were used as control treatments.The production and nutri-tional quality characteristics of alfalfa varieties were comprehensively studied.The results showed that the highest plant height was observed in M1,M2 and M3 under the PRⅢ treatment during the second cut,sig-nificantly exceeding CK1 or CK2.M1 and M3 exhibited the highest leaf number under PRⅢ in the second cut,whereas M4 had the highest leaf number under PRⅡ.Additionally,total biomass was highest for M1,M3 and M4 under PRⅢ,with PRⅢM3 reaching a maximum of 16.23 g/pot,occupying 85.29%and 214.12%of CK1 and CK2,respectively.While phosphate rock powder treatment did not significantly affect the crude protein content of M1,M2,and M3,PRⅢ significantly increased total protein in M4.PRⅡM2 and PRⅡM1 demonstrated the highest ether extract content in the first cut and the second cut,respec-tively.PRⅠM1 exhibited the highest calcium content in the first cut,and PRⅢM3 had the highest calcium content in the second cut.PRⅢ significantly enhanced phosphorus absorption efficiency across all alfalfa varieties,while PRⅡ showed superior phosphorus utilization efficiency,particularly in the second cut.In conclusion,phosphorite rock powder,particularly PRⅢ influenced alfalfa growth and quality.Gannon No.9 excelled in leaf number and plant height,while Zhongmu No.1 demonstrated superior protein produc-tion.These findings provide valuable insights for selecting optimal alfalfa varieties and phosphorus fertilizer applications in calcareous soils.
Phosphate rock powderOrganic fertilizerAlfalfaGrowth characteristicsNutritional quality
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维普
