Inoculation response of wheat to selected indigenous Azorhizobium
2002
Khokhar, S.N. (National Agricultural Research Centre, Islamabad (Pakistan). Land Resources Research Programme) | Razzaq, A. | Majeed, A.
Two separate experiments were conducted to determine the response of wheat to selected indigenous azorhizobium inoculations in a low fertility soil at NARC, Islamabad. First experiment, a 2-factor randomized complete block design (RCBD) included two wheat varieties (Chakwal 86 and Kohistan 90) and three diazotrophs namely NFD-srn2/95 (Azorhizobium caulinodans, indigenous), IRBG 42 (Azorhizobium caulinodans, exotic) and PAC-19/1(8k-8/Tha18, Chickpea- rhizobium). The second experiment, a single factor RCBD, included wheat variety, MH97, treated with NFD-srn2/95, IRBG 42, NFD/srn-2/95+ IRBG 42, and mixed inoculant in combination with two nitrogen levels (50 kg/ha and 100 kg/ha) and an uninoculated control. Results indicated significant effect of Azorhizobium inoculation in both experiments as well as significant inoculation x variety interaction, in the first experiment. Significant differences in terms of root dry biomass, total nitrogen/ plant and 1000-grain weight were observed in the first experiment. Inoculation with PAC-19/1 and NFD-srn2/95 resulted in 50% and 30% more nitrogen accumulation in shoot, respectively. Highest grain yield of 5163 kg/ha was obtained in variety Kohistan 90 inoculated with IRBG 42. In second experiment, number of tillers, root dry biomass, nitrogen content, and grain yield differed significantly between the treatments. All inoculated treatments, except mixed inoculant application, produced significantly higher grain yield than control. Inoculation brought an increase in the range of 35%-99% in grain yield over uninoculated unfertilized control.
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