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Digitale Medien

Nitrogen cycling in grasslands at Kanpur, India (1979)

Mishra, L. C.

Springer

Plant and soil 53 (1979), S. 361-371

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ISSN: 1573-5036

Schlagwort(e): Biomass ; Grassland ; Nitrogen cycling

Quelle: Springer Online Journal Archives 1860-2000

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Summary The present paper deals with the distribution of nitrogen in the different plant compartments and in the top 30 cm soil among the protected, semi-protected and open-grazed grasslands at Kanpur (26° 26′ N latitude and 80° 22′ E longitude). The protected site indicated greater nitrogen content (g N m−2) in the aboveground and belowground plant parts as compared to those of semi-protected and open-grazed sites. Nitrogen content in the combined live and dead herbage varied from 2.6 to 53.5 g m−2 in protected community, 1.6 to 27.6 g m−2 in semi-protected and 0.9 to 17.4 g m−2 in open-grazed community. The content ranged between 1.0 to 17.7, 0.5 to 9.7 and 0.4 to 6.6 g m−2 for belowground and from 0.1 to 1.1, 0.1 to 0.5 and 0.1 to 0.3 g m−2 for litter compartments in protected, semi-protected and open-grazed community respectively. A significant positive relationship was found with the nitrogen per gram dry weight in combined live and dead herbage of the study sites and the average monthly relative humidity. The distribution pattern of nitrogen in plant/soil system indicated that the major portion of nitrogen (91 per cent in the protected, 95 per cent in the semi-protected and 96 per cent in the opengrazed stands) in the system was retained in the soil while a small fraction of it (9 per cent, 5 per cent and 4 per cent on protected, semi-protected and open-grazed area respectively) resided in plant compartments. Partitioning, uptake, transfer and release of nitrogen have been discussed in detail for all three sites.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02277870

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2

Digitale Medien

Effects of fertilizer factory effluent on soil and crop productivity (1987)

Singh, K. K. ; Mishra, L. C.

Springer

Water, air & soil pollution 33 (1987), S. 309-320

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ISSN: 1573-2932

Quelle: Springer Online Journal Archives 1860-2000

Thema: Energietechnik

Notizen: Abstract Laboratory experiments were conducted to evaluate the impact of various concentrations (2.5, 5, 10, 25, and 50%) of fertilizer factory effluent on certain physico-chemical properties of soil, and germination, growth, photosynthetic pigments, and dry matter productions of corn (Zea mays L.) and rice (Oryza sativa L.). The effluent was highly alkaline and contained high amounts of N+, Ca2+, Na+, Cl−, CO in3 su− , HCO in3 su− and suspended and dissolved solids. Its BOD value was also high. The effluent treatment to soil resulted in a significant increase in the water soluble salts, electrical conductivity, cation exchange capacity, pH, N, Ca, Na, and Cl content of the soil for effluent concentrations of 10% and above. The effluent in the lower concentrations of 2.5 and 5 % enhanced the growth and development of corn and rice. Higher concentrations of effluent (10% and above), however, inhibited the percentage of seed germination and caused deleterious effects on the dry matter production, yield (quantitative and qualitative) and the photosynthetic pigments of both test crops.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00294199

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3

Digitale Medien

Effect of fly ash extract on growth and development of corn and soybean seedlings (1986)

Shukla, K. N. ; Mishra, L. C.

Springer

Water, air & soil pollution 27 (1986), S. 155-167

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ISSN: 1573-2932

Quelle: Springer Online Journal Archives 1860-2000

Thema: Energietechnik

Notizen: Abstract Different concentrations of aqueous extract of fly ash were prepared by soaking air dried fly ash and mixing thoroughly with an electric blender. Extracts were then applied to the seeds of corn (Zea mays L.) and soybean (Glycine max L.) after being filtered through a Whatman No. 42 filter paper. Fly ash extract in the lower concentration range of 0.5 to 1.0% (W/V) had no significant effect on germination and seedling growth of each of the two crops. Higher concentrations of fly ash extracts, however, had deleterious effects on the percentage of germination, viability, number of roots, shoot and root length, fresh weight and dry weight of seedlings of both the crops. The elemental concentrations in shoot and root systems of control seedlings of corn and soybean were found to be the same, whereas in the extract treated corn and soybean seedlings, a relatively high elemental concentration was found in roots as compared to shoots.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00464778

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