Plant and Soil

, Volume 65, Issue 3, pp 345–349 | Cite as

Availability of fixed NH4+ to crops

I. Native fixed form
  • Dipankar Saha
  • R. Mukherjee
  • Asit K. Mukhopadhyay


Significantly lower amounts of exchaneable NH4, soluble NO3 and clay-fixed NH4 forms of N were observed in the unfertilized fields with high rather than low-density cropped plots. Irrespective of planting densitites, the fixed NH4 content in soil increased with increase in the period of crop growth. N uptake by plant and total bacterial population of rhizosphere soil were significantly higher in the plots with the high than with the low-density planting. Availability of native fixed NH4+ to crops and biological utilization of a considerable amount of recently mineralized NH4+ in fixed form is indicated.

Key words

Ammonium Fixed ammonium Maize Mineralization Nitrate Nitrite Rhizosphere 


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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1982

Authors and Affiliations

  • Dipankar Saha
    • 1
  • R. Mukherjee
    • 1
  • Asit K. Mukhopadhyay
    • 1
  1. 1.Agricultural Chemistry and Soil Science DepartmentFaculty of AgricultureKalyaniIndia

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