叶面喷施有机硒肥对核桃果实中硒含量的影响OA

Taking 18-year-old Xiangling walnut trees as test materials,a comparative experiment was conducted via foliar spraying of organic selenium-enriched fertilizer.Two fertilizer dilutions(200-fold and 300-fold)were set up,with clean water as the control group.This study explored the effects of foliar application of organic selenium fertilizer on selenium content in walnut fruits,in order to provide references for formulating technical regulations for selenium-enriched walnut production.The results showed that the selenium content in walnuts treated with both 200-fold and 300-fold organic selenium fertilizer met the local selenium-enriched standards of Shaanxi Province,with the maximum average selenium content reaching 273.3 μg·kg-1.The selenium content of walnuts first increased and then decreased as the spraying period was postponed.Comprehensive analysis indicated that spraying 200-fold diluted organic selenium-enriched fertilizer during Period 2(June 1 to 30)yielded the highest selenium content in walnuts and achieved the optimal application effect.