施硫对苋菜生长及品质的影响

目的]确定降低苋菜硝酸盐累积效果最佳的施硫浓度,为完善苋菜科学施硫技术提供指导。方法]采用盆栽方法,设置4个施硫肥水平,测定其对植株生长及硝酸盐、Vc含量的影响。结果]施硫提高了苋菜的株高、单株重、最大叶长及最大叶宽。当硫浓度为20 mg/kg(S_2)时,株高最高,较不施硫处理(S_0)增加了14.3%。3个硫处理(S_1~S_3)硝酸盐含量降幅为20.6%~64.7%。施硫浓度为10 mg/kg时植株可食部分硝酸盐含量降低了64.7%。施硫处理苋菜V_C含量增加了19.7%~28.3%。结论]大田苋菜适宜的施硫浓度为10~20 mg/kg。

Effect of Sulfur Fertilizer on Growth and Quality of Edible Amaranth

Objective] The optimal sulfur concentration for reducing nitrate accumulation content in edible amaranth was assured to provide guide for sulfur application. Method] 4 sulfur level was set, pot test was carried out to determine plants′s growth,nitrate,Vc content. Re-sult] Plant height,weight per plant,maximum leaf length and maximum leaf width were increased by applying sulfur fertilizer. The plant height was the highest when sulfur concentration was 20 mg/kg(S2),incerased by 14. 3% compared with no sulfur fertilizer treatment (S0). S1 ~S3 of nitrate content was decreased by 20. 6% -64. 7%. Nitrate content of plant in edible part was decreased by 64. 7% when sulfur concentra-tion was 10 mg/kg. VC content of sulfur treatment were increased by 19. 7% -28. 3%. Conclusion] Suitable sulfur concentration was 10-20 mg/kg for edible amaranth in field.