Distribution and Status of Different Forms of Nitrogen in Soils of Haryana

Nitrogen status of soils of Haryana was studied by taking profile and surface soil samples from different agro-climatic-regions. In surface soil samples total N rangedfrom 150 to 1000 ppm, organic N 108 to 711 ppm, fixed NH₄⁺-N 9 to 380 ppm, and available N from 38 to 211 ppm. Tn general, the total, organic and fixed NH₄⁺-N decreased with depth in all profiles, whereas there was 110 consistent trend in the distribution of N₄⁺ and NO₃⁻-N in soils. Organic cwhon gave signficant positive correlations with total N, organic N, fixed NH₄⁺ and available N. Clay content was positively correlated with fixed NH₄ and available N. Organic carbon and mineral N were the prime factors affecting available N status of these soils.