Kassem,, M., Hassouna, B. (2004). 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, 29(2), 515-526. doi: 10.21608/jpp.2004.238495
M. M. A. Kassem,; B. A. Hassouna. "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, 29, 2, 2004, 515-526. doi: 10.21608/jpp.2004.238495
Kassem,, M., Hassouna, B. (2004). '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, 29(2), pp. 515-526. doi: 10.21608/jpp.2004.238495
Kassem,, M., Hassouna, B. 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, 2004; 29(2): 515-526. doi: 10.21608/jpp.2004.238495
EFFICIENCY OF SEED INOCULATION WITH N-FIXING BACTERIA IN DECREASING THE MINERAL N REQUIREMENTS FOR EARLY AND LATE SOWN COTTON PLANTINGS
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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