RESPONSE OF BLACKGRAM ( Vigna mungo L.) TO BRADYRHIZOBIUM INOCULATION AS INFLUENCED BY PHOSPHORUS LEVELS

A thesis Submitted to the Department of Soil Science Sher-e-Bangla Agricultural University, Dhaka In partial flit flhlment of the requirements for the degree of MASTER OF SCIENCE (MS) IN SOIL SCIENCE SEMESTER: JULY-DECEMBER, 2007

A pot culture experiment was conducted at the Net I-louse and laboratory of Soil Science Division in Bangladesh Agricultural Research Institute (BAR!), Joydebpur, Gazipur during September to December 2007 to evaluate the performance of phosphorus levels and Thmlyrinzohwm on growth. nodulation, yield, phosphorus, nitrogen content and uptake and other yield contributing characters of blackgram variety BAR? Mash-I. Bradvrhi :uhiiw, inoculant (BAR] ltVm-301) was used for the above experiment. 'lucre were ten treatment combinations with two lircsc4rhjzohjum namely non-inoculated and inoculated and five levels of phosphorus cã 0. 10, 20. 30 and 40 kg ha with thur replications. Signilicant influences of phosphorus level were observed in nodulation and yield (seed, pod and stover) and nutrient content and uptake by seed and other yield contributing characters. Application of phosphorus up to 20 kg ha'1 progressively increased the values of all the parameters. Further. higher doses application of phosphorus decreased the value of all of these parameters. Rradt'rhizobium inocutant significantly increased nodule number and weight, root and shoot weights, root and shoot lengths. seed yield. pot yield, stover yield. plant height. 100-seed weight. pods plant". seeds pod". N. P content in seed and N. I' uptake b> seed, protein content in seed and protein yield compared to non-inoculation. /?radi','Izi:obi,,,,: inoctihition 4 along with application ofphosphorus 20 kg ha' produced the highest nodulation. yield and other parameters compared to other treat,flen( combinations