不同土壤养分调查及对花生幼苗根系伸长的影响OA

[Objective]To explore the effects of nutrient content in different soil types on root growth of peanut seeds during germination.[Method]Soil nutrients were measured from five peanut producing areas:Liucheng Town,Dongyuan City,Heyuan City,Guangdong Province;Lintou Town,Dianbai District,Maoming;Chengcun Town,Yangxi County,Yangjiang;Zhongluotan Town,Baiyun District,Guangzhou;Dongshi Town,Pingyuan County,Meizhou.The peanut variety Yueyou 1823 was planted in the control medium(peat soil∶perlite=1∶1),and the root index was determined.The correlation between root length and hypocotyl length of peanuts and soil nutrient factors was analyzed.[Result]The contents of soil organic matter(9.06-14.97 g/kg),total nitrogen(0.68-0.98 g/kg),total phosphorus(0.40-0.58 g/kg)and available potas-sium(85.3-144.9 mg/kg)in the five peanut producing areas were at a moderate level.The content of available phosphorus in Meizhou and Heyuan is the deficiency level,5.9 and 4.5 mg/kg respectively,and the soil phosphorus supply capacity is poor.Except Maoming,the total po-tassium content of the other 4 producing areas is relatively rich,between 27.5-51.0 g/kg.Soil available magnesium(2.34-11.30 mg/kg)and available calcium(25.92-89.60 mg/kg)are deficient.And the available boron content is very rich.The germination rate of peanut seeds un-der 6 treatments was above 93%,and the germination rate of peanut seeds in Heyuan and Meizhou was 100%.The average root length was 3.86-5.24 cm.The average hypocotyl length was between 1.74 and 2.23 cm.The average peanut seed root length and hypocotyl length in Heyuan area were significantly higher than those in other areas.The root length of peanuts was positively correlated with soil organic matter and total phosphorus,and the correlation coefficients were 0.978 3 and 0.909 4,respectively.There was a significant positive correlation between hypocotyl and soil organic matter,and the correlation coefficient was 0.9561.[Conclusion]The soil type and nutrient content of Liucheng Town in Dongyuan County of Heyuan are the most suitable for the root growth of peanut seed in the early stage of germination.The peanut roots and hypocotyl elongation and growth are correlated with the organic matter and total phosphorus in soil to varying degrees.Therefore,peanut plant-ing in Guangdong Province should pay more attention to the fertilization management of soil organic matter,nitrogen,phosphorus and other nu-trient factors,which is conducive to the cultivation and field production of peanuts.