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National Agricultural Research Centre (NARC), Islamabad  established in 1984, is the largest research centre of the Pakistan Agricultural Research Council (PARC). NARC, with a total land area of approximately 1400 acres, is located near Rawal Lake, six kilometers south-east of Islamabad. Physical facilities in term of experimental fields, laboratories, green houses, gene bank, library/ documentation, auditorium, machinery & lab equipment repair workshops, stores, hostels, cafeteria, audio visual studios, are also available at NARC.

Journal Article

Journal article

Impact of calcium sulphate and calcium carbide on nitrogen use efficiency of wheat in normal and saline sodic soils  [2009]

Mahmood, I.A. (National Agricultural Research Centre, Islamabad (Pakistan). Inst. of Natural Resources and Environmental Sciences); Salim, M. (National Agricultural Research Centre, Islamabad (Pakistan). Inst. of Natural Resources and Environmental Sciences); Ali, A. (National Agricultural Research Centre, Islamabad (Pakistan). Inst. of Natural Resources and Environmental Sciences); Arshadullah, M.; et al.

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A pot experiment was conducted to study the effect of calcium as CaSO4 or CaC2 (20 mg Ca per kg of soil from each source) on N use efficiency of wheat (Triticum aestivum L. var. Inqlab-91) under normal (ECe=0.7 dS m-1, SAR=4.37 and pH=8.1) and saline-sodic soils (ECe=8.7 dS m-1, SAR=21.43 and pH=9.2) in glass house at National Agricultural Research Centre, Islamabad during Kharif season 2007-08. The crop was grown to maturity and data on tillering, plant height, panicle length, grains per spike, straw and grain yields were recorded at the time of crop harvest. A considerable reduction in plant height (38%) and grain yield (44%) was observed when grown in saline-sodic soil (ECe=8.7 dS m-1) as compared to normal soil (ECe=0.7 dS m-1) while N application significantly improved plant growth and yield in both conditions. Among the treatments, N application even at lower rate supplemented with calcium as CaSO4, CaC2 or their mixture (1:1) showed better performance than that of straight N application in both soils. A 41 to 53% increase in plant growth and 36 to 44% in grain yield over control (without N) were observed through N fertilization at 25 and 50 mg per kg of soil supplemented with calcium as CaC2 in saline-sodic soil. Similarly, calcium as CaSO4 application also caused a considerable improvement in plant growth (34 to 52%) and grain yield (25 to 43%). However, the effect of mixture application of CaSO4 and CaC2 (1:1) on plant growth and yield was compara
tively more pronounced for both the soils. Interestingly, lower dose of N (25 mg per kg) with calcium as CaC2 alone or in combination with CaSO4 (1:1) supplementation showed statistically equal performance to that of higher dose (N=50 mg per kg) alone. Tissue Na+ significantly decreased while K+ and Ca2+ concentrations were elevated due to N application along with calcium nutrition. Maximum N uptake and apparent N recovery were revealed from treatments where N was applied @ 50 mg per kg soil supplemented with calcium as CaC2 or CaSO4 alone or their mixture. A highly significant negative correlation (r = - 0.975) between dry matter yield and Na+ concentration and positive correlations (r = 0.8693 and 0.9396) between dry matter yield and K+ and Ca2+ concentrations, respectively in plant tissues was observed in saline-sodic soil.

From the journal

Soil and Environment (Pakistan)

ISSN : 1019-729X