摘要
通过不同施肥处理试验,研究了设施栽培条件下,生菜产量、养分吸收、土壤养分变化,生菜食用部位硝酸盐含量和氮磷肥料利用率之间的关系,以期为生菜合理施肥,提高肥料利用率提供科学依据。研究结果表明,氮磷钾合理配施(试验中N,P2O5,K2O用量分别为240,120,300kg/hm2)可促进生菜对养分的吸收,提高氮磷肥料利用率,降低食用部位硝酸盐含量和土壤硝态氮残留,从而降低氮,磷淋失和环境污染风险,提高商品蔬菜品质。
Through the experiment in different methods of fertilizer application, the relationship among head lettuce yield, nutrient absorption,change of soil nutrient contents, contents of nitrate and the fertilizer-N,P use efficiency was researched under protectorate condition for the reasonable method of fertilizer application and the improvement of fertilizer use efficiency. The results showed that rational application of N, P2O5 and K2O (N 240?kg/hm2, P2O5 120?kg/hm2, K2O 300?kg/hm2 in this experiment) could improve the nutrient absorption of head lettuce, improve fertilizer-N,P use efficiency, decrease nitrate concentration in head lettuce and nitrate residual in soil, therefore minimize leakage of nitrate-N and P which formed serious threats to environment pollution, and improve the quality of head lettuce.
出处
《云南农业大学学报》
CAS
CSCD
2003年第3期221-224,227,共5页
Journal of Yunnan Agricultural University
基金
国家科技部"十五"重大专项资助项目(K99-05-35-02)
云南省自然科学基金项目(2002C0040)
