Nitrate assimilation in leaf blades of wheat of different age [Tricitum aestivum, soil nitrate]
1980
Pokhriyal, T.C. | Sachdev, M.S. | Grover, H.L. | Arora, R.P. | Abrol, Y.P. (Indian Agricultural Research Inst., New Delhi. Nuclear Research Lab.)
A field experiment on wheat (Tricitum aestivum L.) cv. Shera grown at 120 kg N /ha was conducted. Half of the dose of fertilizer N was applied at the pre-sowing stage and the other half when the seedlings were one month old. The leaf blades were examined for their NO('-)(,3) content and NO('-)(,3) assimilatory activity at various stages of growth and development. Soil nitrate level at 50 cm depth was determined throughout the wheat growing season in terms of concentration ( micro-g/ml) and total amount (kg /ha). The upper leaf blades were examined for their capacity to assimilate NO('-)(,3). Highly significant correlation between NR (nitrate reductase) activity and NO('-)(,3), and between soil NO('-)(,3) and leaf blade NO('-)(,3) was observed. Findings on low soil NO('-)(,3) status during the reproductive phase and the capacity of the upper leaf blades to assimilate additional amounts of NO('-)(,3), point to the need for developing a programme of soil fertilizer application whereby all the leaf blades can utilize the NO('-)(,3) optimally and thus result in greater N harvest
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