title: [Effects of applying nitrogen fertilizer at different stages in ploughed furrow on dry matter production and yield of rice].
abstract: The effects of applying nitrogen fertilizer in ploughed furrow at different stages on dry matter production and yield of rice were studied in a field experiment in 1999. The results showed that applying N fertilizer at booting stage (BS) had better effects on dry weight (2.9 g.hill-1) of leaf, stem and whole plant than at panicle primordia formation stage (PPFS), tillering stage (TS) and regular N fertilization (RF). Meanwhile, the dry weight of leaf and sheath as well as the leaf area index (LAI, 8.9) could be maintained at a high level for a relative long time in BS treatment, compared with PPFS, TS and RF treatments. Similar phenomenon was observed in the growth velocity (0.73 g.d-1.hill-1) of stem and whole plant, and the dry weight (10434 kg.hm-2) of seed. The grain yield of rice followed the sequence of BS > or = PPFS > TS > or = RF. Thus, the optimum stage of applying N fertilizer in ploughed furrow was the booting stage.
authors.affiliation: Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016.
authors.forename: Kun
authors.initials: K
authors.lastname: Shi
authors.forename: Shufeng
authors.initials: S
authors.lastname: Hao
authors.forename: Hongtu
authors.initials: H
authors.lastname: Xie
authors.forename: Xudong
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000383:Agriculture; D018556:Crops, Agricultural; D005308:Fertilizers; D009584:Nitrogen / Q000737:chemistry*; D012275:Oryza / Q000502:physiology*
chemical_list: D005308:Fertilizers; D009584:Nitrogen