The effect of application of nitrogen fertilizer on the growth of opium poppy in north central India
1984 ◽
Vol 102
(2)
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pp. 361-366
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Keyword(s):
N Uptake
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SummaryIn a 2-year field study conducted at Lucknow (26·5° N, 80·5° E and 120 m altitude), plant height, leaf area index, dry-matter accumulation and N uptake of opium poppy (Papaver somniferum L.) followed a sigmoid path. After attaining a peak of accumulation at 120 days, dry matter declined in plots given N fertilizer but remained static in the control. N application (50, 100, 150 and 200 kg/ha) increased the opium, seed and morphine yields compared with the control. Morphine concentration (%) in the opium, however, increased up to 100 kg N/ha and decreased when N doses exceeded that level. Divided application of N, i.e. half at sowing and remainder at the stem elongation stage, proved beneficial for opium, seed and morphine yields.
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1987 ◽
Vol 10
(1)
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pp. 1-14
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1966 ◽
Vol 46
(2)
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pp. 195-203
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1997 ◽
Vol 48
(1)
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pp. 91
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2017 ◽
Vol 5
(4)
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pp. 423-429
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2002 ◽
Vol 188
(2)
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pp. 81-85
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