Vol. 6, Issue 4 (2018)
Effect of integrated nutrient management on nitrogen dynamics under groundnut-wheat system of typic haplustepts in long term fertilizer experiment
Author(s): Pradip Tripura, KB Polara, KB Parmar and KH Bodar
Abstract: Our study on soil N dynamics was conducted in the year 2015 after wheat. It focused on the effects of soil managements with sole and combined applications of mineral and organic fertilizers in the long-term experiment conducted since 1999 at instructional farm, College of Agriculture, Junagadh Agricultural University, Junagadh, Gujarat. The long-term fertilizer experiment included twelve fertilization treatments and each treatment had four replicates were arranged in a randomized block design. With respect to forms of nitrogen it can be deduced that there was a declined in soil nitrogen levels. After 16 year application of sole and combined applications of mineral and organic fertilizers in the long-term fertilizer experiment the available-N status marginally increased in treatments which received FYM (T8 and T9). At initial stage of experiment (1st year) average available nitrogen status of LTFE soils falls under medium range (250-500 kg N ha-1), but after 16th year all treatments exhibited low range of available nitrogen status in soil, except treatments which received FYM (T8 and T9) which showed medium range in available-N status of long term fertilizer experiment soils. The overall, organic carbon and total-N status increased significantly after 16 year of experiment, whereas ammonical-N and nitrate–N status of LTFE soils in general decreased after long run, but ammonical-N increased in the treatment T10 due to fixation of atmospheric nitrogen by Rhizobium bacteria. It was established here that for maintaining N fertility of soil at long run, addition of FYM is essential with inorganic fertilizers. In long term fertilizer experiment soils, the per cent depletion of different forms of nitrogen was interesting under all treatments. The total-N and organic carbon showed negative depletion after a span of 16 year, whereas mixed trend was observed in available-N fraction, where maximum positive per cent depletion was recorded in T7 and T12 treatment and maximum negative per cent depletion was noted in T9 treatment which received FYM.
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How to cite this article:
Pradip Tripura, KB Polara, KB Parmar, KH Bodar. Effect of integrated nutrient management on nitrogen dynamics under groundnut-wheat system of typic haplustepts in long term fertilizer experiment. Int J Chem Stud 2018;6(4):3234-3239.
