Effect of a High Nodulating Selection of Chickpea Cultlvar ICC 4948 on 5011 Properties of a Chlckpea- Sorghum Cropping System Yield and uri icon

abstract

  • Plants of widely different nodulation capacities occurring in a chickpea variety ICC 4948(=0 130) and lat-er developed into separate lines were compared in ch ickpcap$orghum field. aexperiment. The high nodul,'ing (liN) chickpca scl.clion produced only marginally h i g her'grai n yield (3.3·6.9%, mean or the two N levels) than th.'lt of the unselected normal variety and the:low nodulating (LN) sd?ction. Out t h e liN selection fixed signiricanUy more atmospheric nitrogenat low soil N (as measured by acetylene reduction a\.:tivity). and also liupported increased microbial plotsactivity in the rhizosphcre. Also. at low soil mineral N I.::vel. the microbial (lush C:N ratio in the of theof the liN selection was narrower (16.0) than that in plols LN (24.4) nnd nonnodulating(20.4) selections. (ncreased microbial activity. along with a narrower flush C:N ratio in the case.of HN seh:clions compared with the LN selection, lead to nil increased availability of N forthe following sorghum crop. This resulted in an extra uptake of 20 kg N ha·1 by chickpea and!sorghum together. These studies indicated the benefits of liN selections of chickpea under low soilN and inigated conditions for increased N yield and incrensed microbial activity in a chickpea?sorghumcropping syslem These results are for I year only and suggesl tile need 10 s lu dy the cumul.tive crre? .of the high BNF lines on crop productivity over lime in a cropping systems perspective:

publication date

  • 1995