Abstract
Legume plants capable of fixing N 2 in the presence of abundant N in the soil are desirable to better integrate legumes into crop rotations including high N-demanding cereals. It has been suggested that the exotic bean line 'Puebla 152' may be insensitive to nitrate levels that normally inhibit bean nodulation and/or rate of fixation. Four levels (0, 30, 60, 120 Kg N/ha) of N as 15 N-depleted ammonium nitrate were partialized into five weekly applications and imposed on Puebla 152, snap bean `Eagle', and non-nodulating soybean `Clay', in field experiments conducted in 1991 and 1992 on a very low N soil. CIAT's non-nod bean line Nod 125 was included in 1992. Each increment of added N increased the total N accumulated by the plants, in all genotypes. No significant genotype × N fertilizer interactions were detected. In average, Puebla 152 accumulated 25 and 46% more N than Eagle and Clay, respectively, in 1991, and 53, 119 and 119% more N than Eagle, Clay and Nod 125, respectively, in 1992. The analysis of 15 N to estimate the proportion of N derived from the atmosphere is underway and will be presented at the meeting.
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Claims 7
Claim · model-written summary
Each nitrogen increment increased accumulated nitrogen in every genotype.
Not reportedTaxonComparator
Verbatim
e0“Each increment of added N increased the total N accumulated by the plants, in all genotypes”
t0“COMMON BEAN (Phaseolus vulgaris)”
Claim · model-written summary
No significant genotype by nitrogen fertilizer interaction was detected.
Not reportedTaxonDirection
Verbatim
e0“No significant genotype × N fertilizer interactions were detected”
t0“COMMON BEAN (Phaseolus vulgaris)”
Claim · model-written summary
Puebla 152 accumulated 25% more nitrogen than Eagle in 1991.
Not reportedTaxon
Verbatim
e0“Puebla 152 accumulated 25 and 46% more N than Eagle and Clay, respectively, in 1991”
t0“COMMON BEAN (Phaseolus vulgaris)”
Claim · model-written summary
Puebla 152 accumulated 46% more nitrogen than Clay in 1991.
Not reportedTaxon
Verbatim
e0“Puebla 152 accumulated 25 and 46% more N than Eagle and Clay, respectively, in 1991”
t0“COMMON BEAN (Phaseolus vulgaris)”
Claim · model-written summary
Puebla 152 accumulated 53% more nitrogen than Eagle in 1992.
Not reportedTaxonMaterial
Verbatim
e0“53, 119 and 119% more N than Eagle, Clay and Nod 125, respectively, in 1992”
t0“COMMON BEAN (Phaseolus vulgaris)”
Claim · model-written summary
Puebla 152 accumulated 119% more nitrogen than Clay in 1992.
Not reportedTaxon
Verbatim
e0“53, 119 and 119% more N than Eagle, Clay and Nod 125, respectively, in 1992”
t0“COMMON BEAN (Phaseolus vulgaris)”
Claim · model-written summary
Puebla 152 accumulated 119% more nitrogen than Nod 125 in 1992.
Not reportedTaxon
Verbatim
e0“53, 119 and 119% more N than Eagle, Clay and Nod 125, respectively, in 1992”
t0“COMMON BEAN (Phaseolus vulgaris)”