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通过盆栽试验研究氮肥不同用量和基追比例对芹菜的产量效应和品质效应。本试验条件下,施氮量为150mg/kg土时(约相当于337.5 kg/hm2)芹菜产量最高,继续增施氮肥,产量显著降低。施氮量为100 mg/kg土时(约相当于225 kg/hm2),Vc含量和可溶性糖含量最高,施氮量增加,芹菜品质显著降低。芹菜叶绿素、硝酸还原酶活性和硝酸盐含量与氮肥用量呈极显著的线性正相关。不同氮肥用量处理的芹菜在不同生育期的硝酸盐积累量均呈明显的“S”曲线。基肥N占100%时,芹菜的生长情况最好,基肥N占50%时,芹菜的叶绿素含量,硝酸还原酶活性,Vc和可溶性糖含量均最大。追施一次肥处理的芹菜叶片硝酸盐含量显著低于追两次肥的处理。
Pot experiment was conducted to study the effect of yield and quality on the yield and quality of celery with different amount and ratio of nitrogen fertilizer. Under the experimental conditions, the yield of celery was the highest when the nitrogen application rate was 150mg / kg soil (equivalent to 337.5kg / hm2). The yield of celery was increased significantly with the increase of nitrogen fertilizer. When the nitrogen application rate was 100 mg / kg soil (equivalent to 225 kg / hm2), the content of Vc and soluble sugar were the highest, while the nitrogen application rate was increased and the quality of celery was significantly reduced. Chlorophyll, nitrate reductase activity and nitrate content of celery had a significantly significant positive correlation with the amount of nitrogen fertilizer. The accumulation of nitrate in different growth stages of celery under different nitrogen application showed obvious “S” curve. Celery N accounted for 100%, the best growth of celery, basal N accounted for 50%, celery chlorophyll content, nitrate reductase activity, Vc and soluble sugar content were the largest. Nitrate content of celery leaves topdressing a fertilizer treatment was significantly lower than that of chasing two fertilizer treatments.