摘要
为明确最佳灌溉施肥条件下设施青菜对氮、磷、钾养分的吸收规律,通过田间试验研究了微喷灌条件下设施青菜在不同生育期氮、磷、钾养分吸收积累和干物质积累的特征以及与养分累积吸收量的相关性。结果表明,在不同生育期,设施青菜氮、磷、钾养分含量存在显著差异(P<0.05)。旺长期青菜体内氮、磷、钾含量均显著高于幼苗期(P<0.05),进入成熟期后略有降低。从养分吸收速率来看,旺长期3种养分的吸收速率均最大,幼苗期和成熟期吸收速率较小。3种养分的吸收速率从大到小依次为钾、氮和磷。整个生育期养分累积量和干物质累积量从大到小依次为旺长期、幼苗期和成熟期。此外,设施青菜体内养分吸收量与干物质积累呈显著正相关(P<0.05),水肥优化耦合条件下氮、磷、钾3要素之间存在着相互促进吸收的正相关作用。
A field experiment was conducted to study characteristics and regularity of nutrient uptake and accumulation ofdry matter of greenhouse vegetable under micro-sprinkling irrigation and their relationship. Results show that N, P and Kcontents in the plant varied sharply with the plant growing stage. The plant in the prime vegetative growth stage was muchhigher in nitrogen, phosphorus and potassium content than that in the seedling stage. However, contents of the nutrientsdeclined slightly after the plant entered its maturing stage. As far as nutrient absorption rate was concerned, the prime veg-etative growth stage was the highest for all the three nutrients and then the seedling stage and maturing stage, and the threenutrients followed an order of potassium 〉 nitrogen 〉 phosphorus. In terms of nutrient and dry matter accumulation, thethree growing stages followed an order of prime vegetative growth stage 〉 seedling stage 〉 maturing stage. In addition, cor-relation analysis shows that plant dry matter accumulation was significantly and positively related to nutrient uptake. Underoptimized coupling of water-fertilizer, positive relationships were found between the three nutrients mutually promoting eachother in absorption.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2015年第3期385-389,共5页
Journal of Ecology and Rural Environment
基金
科技部农业科技成果转化资金项目(2014GB2C000073)
上海市农委推广项目〔沪农科推字(2013)第1-3号〕
上海市农业科学院青年基金(QJ18)
关键词
设施青菜
微喷灌
水肥耦合
养分吸收
greenhouse vegetable
micro sprinkler irrigation
water and fertilizer coupling
nutrient uptake
