M.A. Quayyum
Bangladesh Agricultural Research Institute, Gazipur 1701
A.F.M. Maniruzzaman
Bangladesh Agricultural Research Institute, Gazipur 1701
Mohammad H. Mandal
Bangladesh Agricultural Research Institute, Gazipur 1701
S.M. Altaf Hossain
Department of Agronomy, Bangladesh Agricultural University, Mymensingh
Cropping sequence, Equivalent yield, Inter/strip cropping
Central Research Station, Joydebpur, Gazipur
Crop-Soil-Water Management
Rice, Intercropping, Maize, Manures
The experiment was conducted at the Central Research Station, Joydebpur, Gazipur during kharif season of 1987, 1988, 1989, and 1990. The soil was clay loam with pH 6.3 belonging to Chhiatta series of Grey Terrace soil having moderately slow permeability. The soil is low in organic matter (1.10%), NH4-N (14 mg/kg) , P (15 mg/kg) and S (16 mg/kg). Geographically Joydebpur is situated at 24.0'N latitude and 92.5'E longitude, 8 meter above the sea level. The treatment tested were: 1) Broadcast Aus rice (sale), 2) Row seeded Aus rice (sale) 25 cm apart, 3) Row seeded blackgram, 25 cm apart (sole), 4) Uniform maize row (sale), 75 cm x 25 cm, 5) Maize paired row (37.5 cm row distance within a paired row with 150 cm between two such paired rows + blackgram rows (44%), 25 cm apart, 6) Row seeded Aus rice, 25 cm apart (67%) alternated with sesbania broadcast (33%), 7) Row seeded Aus rice, 25 cm apart (100%) + sesbania broadcast between rice rows (50%), and 8) Row seeded Aus rice, 25 cm apart (67%) alternated with blackgram rows (33%), 25 cm apart. The experiment was set up in a randomized block design with 4 replications. The unit plot size was 11 m x 4.5 m. The varieties Barnali, BR21, and Barimash were used for maize, rice and blackgram, respectively, The experimental plot was fertilized with 20 kg N/ha as basal dose for blackgram (sole), 23 k N/ha as top dressing 15-20 DAS (Days after owing), 23 kg N/ha 35-40 DAS, and rest 23 kg N/ha 55-60 DAS for Aus rice in sole and intercropped situation, 40 kg N/ha as basal dose, 40 kg N 25 DAS and 40 kg N 42 DAS to maize rows only. Full doses of 60 P205 40 K20 and 20 S kg/ha were applied at final land preparation to all treatments except sole blackgram where 40 P205 and 20 K20 were applied. Soil samples at 0-30 cm depth were collected for analysis before sowing early kharif crops and before T.Aman rice. The crops were sown on 15, 18, and 12 April in 1987,1988, 1990, and 3 May 1989. When sesbania plants attained height of 60 cm (45DAS), these were chopped into small pieces and spread within the rice rows and trampled by feet. Blackgram pods were picked once only 70 DAS and then the biomass of blackgram were incorporated into the soil. Maize and rice harvested 90 and 105 DAS. Yield attributes were recorded from 20 plants, which were tagged after germination. Rice equivalent yields were computed by converting yield of intercrops into yield of rice on the basis of prevailing market price of individual crops. After the harvest of early kharif crops transplanted aman rice was grown under four variables N (0, 40, 80 and 120 kg/ha) treatments. Nitrogen treatments were superimposed over the previous cropping experiment splitting each of the plots into sub plots (2m x 4.5 m) for accommodating the N treatments. Nitrogen in transplanted aman rice was applied in three equal splits; 15, 30, and 45 days after transplanting. Triple super phosphate (60 kg/ha) and muriate of potash (40 kg/ha) were applied before transplanting rice seedlings. The crop was harvested at maturity. The data were statistically and the means were computed by LSD test.
Bangladesh Agron. J. 1998, 8 (1 & 2): 21-27
Journal