RESPONSE OF HYBRID MAIZE (Zea mays L.) TO INTEGRATED NUTRIENT MANAGEMENT UNDER DIFFERENT MICROCLIMATIC REGIMES

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dc.contributor.advisorRinjumoni Dutta
dc.contributor.authorGogoi, Tapan
dc.date.accessioned2024-01-18T12:49:17Z
dc.date.available2024-01-18T12:49:17Z
dc.date.issued2021
dc.description.abstractA field experiment entitled “Response of hybrid maize (Zea mays L.) to integrated nutrient management under different microclimatic regime” was conducted at Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat during summer season of 2020 and 2021 with a view to study the effect of microclimatic regime and integrated nutrient management in maize and also the nutrient uptake by the crop and its availability in soil after harvest. The experiment was laid out in a split plot design with three replications. The treatments consisted of three microclimatic regimes viz., M1: 15th February, M2: 1st March and M3: 15th March and four INM viz., N1: 100% RDF (60-40-40 kg/ha) N2: 75% of RDN as inorganic + 25% RDN as vermicompost, N3: 75% of RDN as inorganic + 25% RDN as FYM and N4: 75% of RDN as inorganic + 25 % RDN as enrich compost. The soil of the experimental site was sandy loam in texture, acidic in reaction (pH 5.12 and 5.18), medium in organic carbon (0.65 % and 0.71 %), available P2O5 (22.68 kg/ha and 22.87 kg/ha) and available K2O (144.50 kg/ha and 147.60 kg/ha) while low in available N (229.47 kg/ha and 221.32 kg/ha) in 2020 and 2021 respectively. Experimental findings revealed that different microclimatic regime significantly influenced the growth parameters, yield attributing characters, kernel and stover yield, harvest index and uptake of N, P and K by maize. Among the different microclimatic regimes, crop sown on 15th March resulted in significantly higher values in almost all the growth characters (viz., per cent plant emergence, plant height, leaf area index, dry matter production per plant, crop growth rate, relative growth rate) as compare to the first date of sowing in both the years. Crop sown on 15th March recorded highest values in respect of yield attributing characters like number of kernel rows per cob, kernels per row, number of kernels per cob, weight of cob with husk and weight of cob without husk. Cob yield with husk and cob yield without husk were also significantly higher in 15th March as compared to 15th February sowing in both the years. The highest kernel yield was obtained in 15th March sowing (40.72 kg/ha and 41.30 kg/ha in 2020 and 2021 respectively), which was at par with crop sown on 1st March (39.37 kg/ha and 40.28 kg/ha) and significantly higher than 15th February sowing. The highest stover yield was also obtained in 15th March sowing (79.83 kg/ha and 80.42 kg/ha in 2020 and 2021, respectively). Harvest index was significantly higher in 15th March (33.82 % and 33.90 %) in 2020 and 2021 and was at par with crop sown on 1st March. The uptake of N, P, K by kernel and stover of maize and total uptake were also highest in 15th March sowing in both the years but N uptake by kernel, stover and total uptake remain statistically at par with 1st March. The effect of microclimatic regime on available N, P and K content in soil after harvest of the crop was found to be non-significant. All the integrated nutrient management practices were better as compared to recommended doses of fertilizers (RDF) in terms of growth, yield attributes and yield. Application of 75 % of RDN as inorganic + 25 % RDN as enrich compost (N4) gave significantly higher value in respect of growth parameters studied viz., plant height, leaf area index, dry matter production per plant, crop growth rate, relative growth rate than recommended doses of fertilizers in both the years and remain at par with 75% of RDN as inorganic + 25 % RDN as vermicompost (N2). Among the different integrated nutrient management practices, 75 % of RDN as inorganic + 25 % RDN as enrich compost (N4) proved superior in terms yield attributing characters like number of kernel rows per cob, kernels per row, number of kernels per cob, weight of cob with and without husk. Cob yield with and without husk were significantly higher in 75 % of RDN as inorganic + 25 % RDN as enrich compost (N4) than RDF, but remain at par with 75 % of RDN as inorganic + 25 % RDN as vermicompost (N2). During both the years of experiment, the kernel yield (41.33 kg/ha and 42.55 kg/ha), stover yield (80.00 kg/ha and 80.78 kg/ha) and harvest index (34.79 % and 34.47 %) were found to be significantly higher in 75 % of RDN as inorganic + 25 % RDN as enrich compost (N4) as compared to RDF which was statistically at par with 75 % of RDN as inorganic + 25 % RDN as vermicompost (N2). No treatment differences were observed in respect of number of cob per plant, length of cob without husk, 1000 kernel weight, shelling percentage and N, P, K content in grain and stover due to different integrated nutrient management. However, the available N and K content in soil after harvest of the crop were found to be significantly higher in the control over other treatments. From the economic analysis, it has found that crop sown on 15th March recorded the highest gross return (Rs 89,576.67 and Rs 90,860.00), net return (Rs 62,000.17 and Rs 63,283.50) and B-C ratio (2.35 and 2.40) in 2020 and 2021, respectively. In case of integrated nutrient management practices, the treatment combination of 75 % of RDN as inorganic + 25 % RDN as enrich compost (N4) recorded maximum gross return (Rs 90,933.33 and Rs 93,622.22) and net return (Rs 62,097.33 and Rs 64,786.22) in 2020 and 2021, respectively.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810206396
dc.language.isoEnglish
dc.subAgronomy
dc.themeRESPONSE OF HYBRID MAIZE (Zea mays L.) TO INTEGRATED NUTRIENT MANAGEMENT UNDER DIFFERENT MICROCLIMATIC REGIMES
dc.these.typeM.Sc
dc.titleRESPONSE OF HYBRID MAIZE (Zea mays L.) TO INTEGRATED NUTRIENT MANAGEMENT UNDER DIFFERENT MICROCLIMATIC REGIMES
dc.typeThesis
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