PJB-2019-770
INOCULATION OF NITROGEN-FIXING BACTERIA IN CONJUGATION WITH ORGANIC AND INORGANIC FERTILIZERS INDUCE CHANGES IN GROWTH, NITROGEN ASSIMILATION AND PRODUCTIVITY OF WHEAT
Imadud Din
Abstract
Nitrogen being an essential nutrient for plant growth and development strongly influence crops productivity around the world. Proper management of nitrogen (N) fertilization of crops is required for the optimization of N accumulation, plant growth and productivity. A field experiment was conducted during 2016-17 to test the effects of N-fixing bacteria inoculation in conjugation with farmyard manure (FYM) and urea on growth, N assimilation and grain yield of wheat crop. Wheat seeds were inoculated with N-fixing bacterial strains such as Azotobacter, Rhizobium Sk-8, Pseudomonas K-1 and Azospirillum Er-20, whereas N was applied from different combinations of farmyard manure (FYM) and urea (U) such 100% urea, FYM-75+U-25, FYM-50+U-50. Analysis of the data revealed that seeds inoculation with N-fixing bacterial strains and N sources significantly (P<0.05) delayed days to anthesis and physiological maturity, improved leaf area duration (LAD), crop growth rate (CGR), net assimilation rate (NAR), physiological nitrogen use efficiency (PNUE), apparent N re-translocation, relative N accumulation rate (RN), nitrogen harvest index (NHI) and grain yield against control. The planned mean comparison depicted significant variation in treatments vs control. Higher PNUE, apparent N re-translocation, RN, NHI and grain yield were increased by inoculation of Pseudomonas K-1, while days to anthesis, days to physiological maturity and CGR were increased by inoculation of Azospirillum Er-20 with application of N from FYM-50+U-50. However, higher LAD and NAR was attained on inoculation of Rhizobium SK-8 with FYM-50+U-50 and 100% N from urea respectively. Grain yield shown strong correlation with CGR (0.75), PNUE (0.69) and NHI (0.72). The regression analysis exhibited that grain yield (R2 = 0.71) was strongly dependent on soil available N. Overall result indicated that strains of N-fixing bacteria under integration of FYM and urea augmented plant growth, N accumulation and productivity of wheat crop. Long term experiments are, however, required to explore the potential of N-fixing bacteria with integration of organic and inorganic N sources in wheat crop.
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