Forms and magnitude of leaching loss of nitrogen in wetland rice soils of Cauvery Delta.

摘要

The forms and magnitude of leaching loss in N under different sources and levels of N in the three major wetland rice soils of Cauvery Delta, Tamil Nadu, India were studied. The coarse-textured Madukkur series registered a higher leaching loss of Nunder all N sources, than the heavy-textured Kalathur and Padugai series soils. Out of the total leaching loss, ?1% was in the form of NH2-N, and 77% as NO3-N. Among the N sources tried, application of USG [?urea super granules] recorded the highest leaching loss of N-irrespective of the soil studied. Use of coated fertilizers as well as ammonium chloride was effective in reducing the leaching loss of N in the Madukkur series compared to their performance in heavy-textured soils.