Mineralization and gaseous losses of nitrogen from urea and ammonium sulphate in salt-affected soils

Gandhi, A.P.; Paliwal, K. V.

doi:10.1007/bf00011146

Cited by 37 publications

(14 citation statements)

References 8 publications

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“…However, the reported leakiness of roots under saline conditions (Meharg and Killham 1991;Vieira-Santos et al 2001) and the role of cellular material thus released in affecting rhizospheric microbial functions will have a significant influence on the plant growth and productivity. Form and availability of N further add to these effects since nitrification is retarded under saline conditions (Gandhi and Paliwal 1976;Westerman and Tucker 1974), leaving the plants with NH 4 + as the predominant source of N. In the present study, rooting medium salinity had in general a growth retarding effect (Fig. 2).…”

Section: Discussionmentioning

confidence: 70%

“…The inhibitory effects of NH 4 are more severe for plants grown under saline conditions (Lewis et al 1989;Khan et al 1994). Incidentally, however, NH 4 + should generally be considered as the predominant form of N in saline soils due to inhibition of nitrification (Westerman and Tucker 1974;Gandhi and Paliwal 1976). Therefore, plant species capable of growing under saline conditions may have evolved both morphological and physiological adaptations for uptake and assimilation of NH 4 + (Martins-Loução et al 2000).…”

Section: Introductionmentioning

confidence: 97%

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RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

et al. 2008

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Carbon-14 pulse labeling technique was used to study the effect of rooting medium salinity and form and availability of N on growth and rhizodeposition of wheat (Triticum aestivum L.). Thirty days old plants grown in continuously aerated Arnon and Hoagland nutrient solution were subjected to 14 C pulse labeling for 24 h and transferred to aqueous rooting medium containing 0, 150, and 300 mM NaCl in all combinations with different forms (calcium nitrate, ammonium sulphate, and ammonium nitrate) and amounts (0.5, 1.0, 1.5, and 2.0 times the standard N concentration (150 ppm) of Arnon and Hoagland plant growth medium). Plant samples immediately after pulse labeling, following 7 days of growth under different rooting medium conditions, and the freeze-dried rooting medium were analyzed for total C and 14 C. Length and fresh/dry weight of root and shoot portions and calculated values of unaccounted 14 C were determined. Presence of NaCl in the rooting medium led to a decrease in root and shoot portions. However, NO 3 --fed plants showed better growth than NH 4 + -fed plants at all the three salinity levels. Salinity in rooting medium led to higher rhizodeposition and lower loss of 14 C. Relatively higher proportion of 14 C was released as rhizodeposits and retained in root/shoot portions of plants fed with NH 4 + or NH 4 + +NO 3 -, than those with NO 3 -, while less was respired. The specific activity of the rhizodeposits (kBq 14 C g -1 C) was also higher under saline conditions. The rhizodeposits in NH 4 + -fed plants were more highly labeled as compared to NO 3 --plants.

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Section: Discussionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 97%

RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

et al. 2008

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“…This helps to reduce the ammonium concentration of soil solution, a soil has high CEC, there will be minimum chances of NH3 volatilization and vice versa (Whitehead and Raistrick, 1993). Soil salinity: With many other factors, high level of soil salinity is also an important factor involved in ammonia volatilization (Gandhi and Paliwal, 1976;McClung and Frankenberger. 1985).…”

Section: Factors Affecting Ammonia Volatilizationmentioning

confidence: 99%

Nitrogen Management in Calcareous Soils: Problems and Solutions

Maqsood¹,

Awan²,

Aziz³

et al. 2016

PAKJAS

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Nitrogen (N) is the most widely applied plant nutrient and is a key constituent of animal manures. Improvement in crop yields and high economic returns have been made possible through supplementation of crops with organic and inorganic fertilizers. The movement of N in the environment has been extensively studied and documented. The fate of N ranges from nitrification, denitrification, nitrous oxide formation, leaching of nitrate, and volatilization of ammonia. Even with this knowledge the variation in N movement within the soil, air and water varies greatly with changed edaphic factors. For instance the fate of N fertilizer under calcareous soil systems still has not been investigated widely. We reviewed the sporadic information available on N fate and management in calcareous soils especially in Pakistan. We discussed the sources and fate of N in calcareous soils of Pakistan and also the currently adopted and newly developed method to reduce the N losses.

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“…However, the losses increased with the increase in salinity. Gandhi and Paliwal (2004) measured about 35 ± 5% gaseous N losses at a maximum salinity value (ECe = 45 to 50 mmhos cm -1 ). They also observed that salinity and pH both correlated negatively with the N mineralization and positively with the gaseous losses of ammonia.…”

Section: Introductionmentioning

confidence: 99%

Influence of Salinity on Nitrogen Transformations in Soil

Akhtar

Hussain

Ashraf

et al. 2012

Communications in Soil Science and Plant Analysis

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Laboratory experiments were carried out to study the influence of various salinity levels [1 (control), 9 (medium), 17 (high), and 27 dS m -1 (strong)] on nitrogen (N) transformations in soil fertilized with urea and ammonium sulfate. Generally, soil salinization affected the normal pathway of N transformations. The results showed that salinity (medium to high) inhibited the second step of nitrification, causing nitrite (NO 2 − ) accumulation in soil. The inhibition was more severe in cases of high level of salinity. The greatest salinity level caused inhibition of even the first step of nitrification, leaving more ammonium (NH 4 )-N accumulation in soil. Severity in nitrification inhibition was observed with increase in salinity and rate of N application, which declined with time. Ammonium accumulation with increased salinity caused N losses in the form of ammonia (NH 3 ) volatilization.After 14 days, the NH 3 losses were 1.4-, 2-, and 5-fold greater at 9, 17, and 27 dS m -1 than that of the control (1 dS m -1 ). After 42 days, the losses reached up to 6-fold more than the control at the greatest salinity level. Initially (up to 14 days), NH 3 losses were more from urea than from ammonium sulfate, whereas at the later stages (42 days), the losses were almost equal from both the fertilizers. The overall results revealed significant adverse effects of salinity on N transformations in soil.

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Mineralization and gaseous losses of nitrogen from urea and ammonium sulphate in salt-affected soils

Cited by 37 publications

References 8 publications

RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

RETRACTED ARTICLE: Effect of root-zone salinity and form of N on photosynthate partitioning in wheat (Triticum aestivum L.)

Nitrogen Management in Calcareous Soils: Problems and Solutions

Influence of Salinity on Nitrogen Transformations in Soil

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