Effect of phosphate rock powder application on alfalfa growth in calcareous soil
[Objective]This study aimed to evaluate the effects of phosphate rock powder,an insoluble phos-phate fertilizer,on the growth of three alfalfa varieties(Medicago sativa'Algonquin',M.sativa'Longdong',and M.sativa'Goldqueen')in calcareous soil.[Method]Three grades of phosphate rock powder(PRⅠ,PRⅡandPRⅢ)were used as phosphate fertilizer sources,while water-soluble phosphate and calcium superphosphate was used as the control treatments(CK).A soil pot cultivation experiment on three alfalfa varieties(M.sativa'Algonquin',M.sa-tiva'Longdong'and M.sativa'Glodqueen'),was conducted to assess the potential utilization of insoluble phos-phate resources in China and application of phosphate powder in calcareous soil.Key parameters measured plant height,number of leaves,chlorophyll content(SPAD value),and aboveground and root biomass for each alfalfa variet-ies under different phosphorous fertilizer treatments.[Result]The dry and fresh weight of aboveground biomass of M.sativa'Algonquin'were highest under PRⅠ,increasing by 111.07%and 98.09%respectively,compared to CK.The dry and fresh weights of root biomass of M.sativa'Longdong'were highest under PRⅡ,and increased 483.33%、502.97%respectively,compared to CK.The plant height of M.sativa'Algonquin'under PRⅢwas the highest,with a 16.66%increase compared to CK;however,there was no significant difference between the phos-phate rock treatments and CK for M.sativa'Longdong'.The number of leaves for M.sativa'Algonquinunder'un-der PRⅠshowed the highest increase,with 57.07%compared to CK,while the SPAD valuewas highest for M.sa-tiva'Longdong'under PRⅠ,increasing by 32.56%compared to CK,followed by M.sativa'Algonquin'under PRⅠ,which increased by 15.45%compared to CK.[Conclusion]PRⅠeffectively promoted the growth of alfalfa.M.sativa'Longdong'and'Algonquin'varieties exhibited better absorption and utilization of phosphate rock powder,whereas M.sativa'Glodqueen'responded poorlyto the phosphate treatments in this study.
phosphate rockcalcareous soilalfalfabiomassgrowth index
万方数据
维普
