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A Profitable Deepwater Rice Based Cropping Sequence in Root-knot Nematode Infested Field

M. L. Rahman
Plant Pathology Division. Bangladesh Rice Research Institute. Joydebpur. Gazipur-1701. Bangladesh

S. A Miah
Plant Pathology Division. Bangladesh Rice Research Institute. Joydebpur. Gazipur-1701. Bangladesh

Abstract/ Executive Summary:

Five cropping sequences were tested in a field to investigate their effects on the incidence of root-knot nematode (Meloidogyne graminicola), yield of deepwater rice and economic return. The cropping sequences were deep water rice based, the other crops being mustard, guzttil, sesame and khesari. The nematode population had declined to a considerable level in all the cropping sequences. The cropping sequence, DWR + sesame - mustard + guzitil had the lowest reproduction rate of nematode (0.07) with the hihgest net return and benefit-cost ratio. The traditional pattern, DWR - khesari showed the poor performances.

Keywords: Deepwater rice, Nematode, Cropping sequence.

Location: Manikganj District

Start Date: 00-04-1988

End Date: 00-09-1990

Program Area: Farming System

Commodity: Rice

Objectives:

To see the effect of five selected cropping sequences on the magnitude of nematode infestation in a DWR area of Manikganj.

Methodology:

The experiment was carried out at Manikganj in farmer's field which was naturally infested with M. graminicola. The land was divided into 15 plots (each being 12 m x 7 m) to accommodate five cropping sequences with three replications in randomized block design. The cropping sequences were DWR- khesari, DWR + sesame - khesari, DWR + sesame - mustard. DWR + sesame - guzitil and DWR + sesame - mustard + guzitil. The plots used for any of the Cs remained the same throughout the experiment from April. 1988 to November. 1990. DWR and sesame were sown in ploughed soil between 19 and 30 April. Khesari was sown as relay crop with DWR between 27 October and 7 November. a few days before harvesting of DWR. Guzitil and mustard were sown in ploughed soil between 16 and 23 November. Sesame was harvested between 9 and 11 July. DWR between 7 and 15 November. mustard and guzitil between 14 February and 5 March. Ten soil samples. five. from each diagonal. were collected randomly from each plot using an auger during the months of April. June. August and November in each year. The samples were bulked and three l kg sub-samples were taken from each plot. One hundred ml soil sample was processed from each sub- sample for nematode extraction following the tray method. The reproductive rate (Rr) was calculated by dividing the final nematode population at the end of the experiment in November, 1990 by the initial population in April. 1988. Three months after sowing of DWR. fifty seedlings from each plot were randomly uprooted to count the number of galls in the roots. Two 2 m x 2 m area were marked with bamboo sticks in each plot to record number of tillers before flood (June). at flood (August) and panicles at harvest (November). Yield (t/ha) at 14 % moisture content was taken from crop cut of the whole plot. The grains of other crops from the whole plot were sun dried and weighed. The DWR was damaged due to high flood in 1988 and therefore data on tiller and yield were not taken.

Source of Information: Bangladesh J. Bot. 23 (1): 107-112, 1994 (june)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Findings revealed that it is possible to reduce M. graminicola to a considerable level and to increase economic return from an infested field if DWR is sown mixed with sesame after harvesting of mustard or guzitil.The practice will obviously improve the economy of the poor farmers in the DWR areas at Mainkganj and other parts of the country having the similar problem.

Knowledge Management: Journal