Effects of applying nitrogen fertilizer at different stages in ploughed furrow on dry matter production and yield of rice

Abstract

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 in1999. The results showed that applying Nfertilizer 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 Nfertilization (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 BStreatment,compared with PPFS,TSand RFtreatments. 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≥PPFS>TS≥RF. Thus,the optimum stage of applying Nfertilizer in ploughed furrow was the booting stage.

Key words: Rice, Methods of fertilization, N fertilizer, Dry matter production, Leaf area

CLC Number:

S511

SHI Kun, HAO Shufeng, XIE Hongtu, ZHANG Xudong . Effects of applying nitrogen fertilizer at different stages in ploughed furrow on dry matter production and yield of rice[J]. Chinese Journal of Applied Ecology, 2002, (12): 1579-1581.

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