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Weed Seed Bank Dynamics in Maize – Mungbean – Rice Cropping System at BRRI Farm

Rakiba Shulatana
Senior Scientific Officer
Agronomy Division, BRRI, Gazipur

Lutfun Nahar Laila
Scientific Officer
Agronomy Division, BRRI, Gazipur

Abstract/ Executive Summary:

An experiment was conducted during January to June 2014. Soil samples were collected from field following cropping pattern Maize – Mungbean – Rice maintaining three different soil depths. Viz. 0-10 cm, 10-20 cm and 20-30 cm. After every month the emerging seedlings were identified counted and removed from the pot. Among twelve different weed species three were grasses, three were sedges and six were broad leaf. Higher weed seed germination was found in upper layer (10 cm) of soil (1258 weed/m²). Most of the species showed significant differences among three different soil depth except Echinochloa crusgalli, Eleusine indica, Desmodium trifolium and Oxalis europea. The density of Lindernia ciliata was higher in 30 cm soil depth (365 weeds/m²). Cyperus rotundus (307m²) was second in position which shows higher density in upper layer of soil (10 cm depth). Lindernia ciliata showed highest percent of abundance (29.30%) while Cyperus rotundus under the family Cyperaceae was second in position (22.65%). Lowest abundance percent was found in case of Tridax procumbens (1.02%). Among twelve different weed species Lindernia ciliata ranked in number 1 while Tridax procumbens ranking was 12.

Keywords: Cropping system, Soil depth, Weed seed bank dynamics

Location: BRRI, Gazipur

Start Date: 01-01-2014

End Date: 30-06-2014

Program Area: Farming System

Commodity: Weed management

Objectives:

To find out the richness of weed seed population in Maize – Mungbean – Rice cropping system with different soil depth.

Methodology:

Experiment was conducted during January to June 2014. Soil samples were collected from field following cropping pattern Maize – Mungbean – Rice maintaining three different soil depths. Thirty soil samples were collected randomly from three soil depth: 0-10 cm, 10-20 cm and 20-30 cm using a PVC pipe with a diameter of 8 cm and depth 30 cm. The collected soil samples were stored in labeled paper bags and transported to net house. All the collected soil samples were mixed together according to soil depth. The soil was spread on a plastic trays following length 58 cm, breath 24 cm and depth 2.5cm. The treatments were distributed in single factor CRD with three replications. Sprinkler irrigation was applied regularly to keep the soil moist all the time. After every month the emerging seedlings were identified counted and removed from the pot. The weed species were counted and tabulated then values were converted to one m² and DMRT were done by MSTAT-C software.

Source of Information: BRRI Annual Report, 2009-10, Page: Agronomy 86

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Twenty thousand taka

Total Budget (Tk.) : Twenty thousand taka

Achievement/Findings:

During the reported season, it was found that the broad leaf weed lindernia ciliata abundance was higher even in deeper layer (30 cm) of soil. It can be concluded that the broad leaf weed prevalence was higher in Maize- Mungbean- Rice cropping pattern.

Knowledge Management: Report/Proceedings