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对芹菜、萝卜两种蔬菜进行田间改良试验。结果表明,腐植酸改良剂-灌溉型和腐植酸改良剂-喷施型对降低芹菜、萝卜中硝酸盐含量均达到极显著水平,NPK化肥对降低硝酸盐作用显著,改良效果腐植酸改良剂-灌溉型>腐植酸改良剂-喷施型>NPK化肥;供试蔬菜内硝酸盐含量与硝酸还原酶(NR)的活性呈负相关,腐植酸改良剂-灌溉型最强,其余依次减弱;增产效果明显,腐植酸改良剂-灌溉型>NPK化肥>腐植酸改良剂-喷施型>不施肥。芹菜腐植酸改良剂-灌溉型、腐植酸改良剂-喷施型、NPK化肥处理与不施肥处理均达到极显著差异水平;萝卜腐植酸改良剂-灌溉型处理较NPK化肥、腐植酸改良剂-喷施型、不施肥处理分别增产7.92%、18.94%、28.08%,各处理之间均达到差异显著水平。
Celery, radish two vegetables field trials. The results showed that the humic acid improver - irrigating type and humic acid modifier - spraying type could significantly reduce the nitrate content of celery and radish, the NPK fertilizer had a significant effect on reducing nitrate and the improving effect of humic acid modifier - Irrigation type> Humic acid improver - Spraying type> NPK fertilizer. Nitrate content in vegetables tested was negatively correlated with nitrate reductase (NR) activity. Humic acid improver - irrigation type was the strongest and the others were weakened in turn. The effect is obvious, humic acid improver - irrigated> NPK fertilizer> humic acid modifier - spray> no fertilizer. Compared with NPK fertilizer and humic acid improver, the humic acid ameliorative agent of celery - irrigation type, humic acid modifier - spraying type, NPK fertilizer treatment and non-fertilization treatment all reached the extremely significant difference level; Spraying type, no fertilization treatments increased yields by 7.92%, 18.94%, 28.08%, respectively, reaching significant differences between treatments.