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Presenter: Jin Zhengxun,
Northeast Agricultural University Haerbin
Super high- yielding rice cultivation techniques in cold region: Heilongjiong Province Jin Zhengxun Northeast Agricultural University Haerbin
Natural Resources in Heilongjiang Province Latitude :43°25′~ 53°33′ Area :45.4만 Km2 Elevation: 300~1780m Accumulated T:1800~2800℃ Annual mean temperature : 6 ~ 4℃ Average daily sunshine hours: 2400~2800 h Rainfall: 250~700mm，60% Frost-free period :100~140 d
The average temperature change in Heilongjiang Province
Comparison of day and night temperature difference
Relationship between plant density and yield components Low input :(N-P2O5-K2O) 6-3-3Kg/10a, High input:(N-P2O5-K2O) 12-6-6Kg/10a，Variety：Dongnong V4
Planting Specifications: 36 cm×16 cm, 2-3 plants per hill
5. Maintain reasonable N rate and increase potash application rate Annual N application date（M、D ） N:P2O5:K2O = 1 : 0.5 : 0.8-1
Top-dressing principle of super-high yielding rice 1. Tillering fertilizer: top dressing after turning green,10% relaying fertilizer 10 d after first tillering fertilizer; 2. Top dressingat panicle initiation by diagnosis
Determining application date of fertilizer 1. First top dressing of panicle fertilizerat heading stage (panicle length is generally 0 cm on July 5)
When panicle length is 1cm , the stage is 18 d before heading;
When panicle length is 2cm, the stage is 15 d before heading;
When panicle length is 8cm,the stage is 10 d before heading.
2. Second top dressing of panicle fertilizer at 10d after first top dressing of panicle fertilizer. 3. Third top dressing of panicle fertilizer at heading stage.