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- W4289843038 abstract "Abstract Studies were undertaken to determine the critical Zn levels for cowpea [ Vigna unguiculata (L.) Walp] grown in low N medium and inoculated with Rhizobium. Cowpea ‘California Blackeye No. 5’ was grown for 40 days in a sand culture using Zn application rates of 0, 0.06, 0.5, 1.0, 1.5, 2.0, 2.5, 2.8, 3.0, 3.1, 3.4, 3.7, 4.0, and 4.5 ppm Zn as ZnSO 4 . N 2 fixation was estimated by acetylene reduction. Critical Zn deficiency levels were determined as 12.5, 20, 30, and 50 ppm for upper leaf petioles, upper leaf blades, lower leaf petioles and lower leaf blades, respectively, Critical Zn toxicity levels for these tissues was determined as 145, 273, 300, and 440 ppm, respectively. It was concluded that upper, recently matured, leaf petiole tissue should be used to assess plant Zn status. The percentage of reduction of N 2 fixation was greater than the percentage of reduction in dry-matter accumulation under Zn-deficient conditions. N 2 fixation increased linearly with increased Zn content of nodules and roots. At Zn levels above 150 ppm for both tissues, however, N 2 fixation declined significantly. Applied Zn did not affect the growth and development of the root system and had little effect on reproductive development." @default.
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- W4289843038 date "1985-05-01" @default.
- W4289843038 modified "2023-09-26" @default.
- W4289843038 title "Critical Deficiency and Toxicity Levels of Tissue Zinc in Relation to Cowpea Growth and N2 Fixation" @default.
- W4289843038 doi "https://doi.org/10.21273/jashs.110.3.365" @default.
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