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| 1 | Site-Specific Nitrogen Management in Dry Direct-Seeded Rice Using Chlorophyll Meter and Leaf Colour Chart显示文摘The need to maintain high rice yields and improve fertilizer nitrogen(N)-use efficiency has fueled the use of tools such as leaf colour chart(LCC) and chlorophyll meter(SPAD meter) in managing fertilizer N based on colour of the leaf. Field experiments were conducted during 2011 to 2013 at Ludhiana, India to assess the need for basal N application and to establish critical threshold values of leaf greenness as measured by LCC and SPAD meter for formulating strategies for in-season management of fertilizer N in dry direct-seeded rice(DDSR). Avoiding application of N at sowing did not adversely affect rice grain yield, indicating that basal N application in DDSR was not necessary and might lead to reduced N-use efficiency. Monitoring N uptake rate during the growing season of DDSR suggested that N uptake rate peaked at the two growth stages: maximum tillering(42 to 56 days after sowing(DAS))and panicle initiation stages(70 to 84 DAS). Using the Cate-Nelson procedure, critical LCC and SPAD meter values for fertilizer N application worked out to be 4 and 37, respectively. Real-time fertilizer N management strategy based on applying 30 kg N ha-1whenever SPAD meter or LCC readings fell below the critical values maintained optimum rice yields along with higher N-use efficiency than that observed by following blanket recommendation for fertilizer N in the region. The fixed-time variable-dose strategy consisted of applying prescriptive doses of 20 kg N ha-1at 14 DAS and 30 kg N ha-1at 28 DAS and corrective doses of 30, 40 or 50 kg N ha-1at 49 and 70 DAS depending upon LCC shade to be ≥ 4, 4–3.5, or < 3.5 and SPAD meter readings to be ≥ 40, 40–35, or< 35, respectively. This strategy also resulted in optimal rice yield along with higher N-use efficiency as compared to the blanket recommendation. This study revealed that in DDSR, fertilizer N could be managed more efficiently using the tools of LCC and SPAD meter than the current blanket recommendation. | Ali Mohamed ALI Harmit Singh THIND Sandeep SHARMA YADVINDER-SINGH | 2015 | Pedosphere2015，25，1： | 5 |
| 2 | Management of chronic osteomyelitis using an irrigation suction technique显示文摘 | Bansal VP Harmit S | 1988 | Int Orthop1988，12，4： | 1 |
| 3 | Paleovirology<ce:hsp sp='0.25'/>—<ce:hsp sp='0.25'/>ghosts and gifts of viruses past显示文摘 | Maulik R Patel Michael Emerman Harmit S Malik | 2011 | Current Opinion in Virology2011，，4： | 1 |
| 4 | Treatment of HCV in patients with renal failure显示文摘 | Harmit Kalia Patricia M Lopez | 2007 | Archives of Medical Research2007，38，： | 1 |
| 5 | Management of chronic osteomyelitis using an irrigation suction technique显示文摘 | Bansal VP Harmit S | 1988 | Int Orthop1988，12，4： | 1 |
| 6 | The function and evolution of the restriction factor Viperin in primates was not driven by lentiviruses显示文摘 | Efrem S Lim Lily I Wu Harmit S Malik Michael Emerman | 2012 | Retrovirology2012，9，1： | 1 |
| 7 | Treatment of HCV in patients with renal failure显示文摘 | Kalia Harmit Lopez Patricia M Martin Paul | 2007 | Archives of Medical Research2007，38，6： | 1 |
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