EFFICIENCY OF SEED INOCULATION WITH N-FIXING BACTERIA IN DECREASING THE MINERAL N REQUIREMENTS FOR EARLY AND LATE SOWN COTTON PLANTINGS | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 29, Issue 2, February 2004, Page 515-526 PDF (1.77 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2004.238495 | ||||
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| Authors | ||||
| M. M. A. Kassem,1; B. A. Hassouna2 | ||||
| 1Cotton Research Institute, Agric. Res. Center, Giza, Egypt. | ||||
| 2Soil, Water and Environment Research Institute, Agric. Res. Center, Giza, Egypt. | ||||
| Abstract | ||||
| The hypothesis that seed inoculation -vith the N-fixing bacteria: Azotobacter ctucococcum and Azospiril/um brasilense cou d reduce the meniral N requirements fer early and late sown cotton plantings was tested at the experimental farm of II/allawi Agric: Res. Station, Agric. Res. Center, Minia. Egypt, during 2002 and 2003 Seasons, using Giza 83 cotton cultivar. Seed bacterial inoculation was combined with five \ raded rates of chemical N; 0, 15, 30, 45 and 60 kgN/fed., while the control treatment was 60 kgNlfed. without bacterial inoculation, The obtained results from that study could be summarized as follow: Delaying cotton sowing tended to give taller plants with longer internodes, but it markedy reduced most of yield compor ents and seed cotton yield/fed. While sowing date had no effect on leaves content of chlorophyll. Across planting dates, reducing the chemical N rate to be 0 or 15 kgN/fed. at earlv sowing, even with seed bacterial inoculation, significantly reduced leaves content of chlorophyll, most of growth parameters and yield components, and seed cotton yield/fed. However, with seed inoculation with N-fixing bacteria, leaves content of chlrophyll a, b and total chlorophylls as well as seed cotton yield per fed. were not significantly reduced with decreasing the meniral N rate to 45 kgN/fad., and all studied growth parameters and yield components were not significantly reduced with reducing the mineral N rateto 30 kgN/fad. at late sowing. The interactlon of planting date X N hac significant effects on leaves content of total chlorophyll, number of open bolls/plant, and seed cotton yield/fad. as :h~ reduction in these traits due to reducing the rneniral N rate under early planting da> was higher than under late one. It could be concluded from this study that due to inocutation of cotton seed with N-fixing bacteria, the chemical N rate could be decreased to 45 N/fad. for early planting and to 30kgN/fad. for late planting without significant reduction in seed cotton yield, saving at least 15 kg/fad. from the recommended mineral N rate, reducinq the costs of meniral N fertilizers and environmental pollution at the same time. | ||||
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