RESPONSE OF GRASSPEA (Lathyrus sativus L.) VARIETIES TO DIFFERENT NITROGEN MANAGEMENTS

Abstract

An experiment was conducted at the research field of Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka during the period from November to March 2011 to study the response of grasspea varieties to different nitrogen managements using RCBD (Randomized Complete Block Design) with three replications. During the experiment, three varieties of grasspea (V = BARI khesari-1, V 2 =BARI khesari-2 and V = Local khesari) and six nitrogen management treatments (N 0 = Control, N 3 1 1 = Basal application with 20 kg N ha , N 2 = Basal application with 40 kg N ha and 20 kg N ha and 20 kg N ha -1 -1 at branch initiation stage, N -1 , N at flower initiation stage and N 3 =Basal application with 20 kg N ha 4 =Basal application with 20 kg N ha =Basal application with 20 kg N ha -1 and 20 kg N ha -1 5 at pod initiation stage) were used as treatments. In most of the growth stages the tallest plants, highest number of branches plant , plant dry weight, nodule number plant -1 , nodule dry weight and pod number plant , seed number pod -1 , maximum 1000-seed weight, grain yield, stover yield and harvest index was found from BARI khesari-2, which was followed by BARI khesari-1.In case of nitrogen management, distinct variations were observed between initial and later stages. Though N 2 (basal application with 40 kg N ha ) gave higher results for growth parameters initially, it was found that N (basal application with 20 kg N ha -1 and 20 kg N ha -1 3 at branch initiation) was better at later stages than the previously mentioned treatment. Yield parameters like pod number plant , seed number pod -1 , maximum1000-seed weight, grain yield, stover yield and harvest index were also highest in N 3 followed by N .On the other hand, for different nitrogen management techniques, the lowest results were recorded from N 0 2 . For combination effect of variety and nitrogen management it was observed that initial growth was better in V 1 N (BARI khesari-1 + Basal application with 40 kg N ha -1 ) and V 2 N 2 2 (BARI khesari-2 + Basal application with 40 kg N ha ) while later growth and yield parameters were better in V 2 N (BARI khesari-2 + Basal application with 20 kg N ha -1 and 20 kg N ha -1 3 at branch initiation stage) closely followed byV 1 N 3 (BARI khesari-1 + Basal application with 20 kg N ha and 20 kg N ha -1 at branch initiation stage). -1 -1 -1 -1 -1 -1 -1 -1 -1