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Long-term Effect of Conservation Tillage on Soil Physical Properties in Rice-maize Cropping System

AKM Saiful Islam
Senior Scientific Officer
Farm Machinery and Postharvest Technology Division, Bangladesh Rice Research Institute, Gazipur-1701

Dr. Md. Abu Saleque
Principal Scientific Officer
Soil Science Division, Bangladesh Rice Research Institute, Gazipur-1701.

Dr. Md. Mosharraf Hossain
Professor
Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh-2202.

Abstract/ Executive Summary:

Objective of the study was to investigate the effects of various tillage practices and residue retention on physical properties of soil. Minimum tillage along with crop residue retention, after three years, slightly improved physical properties of soil such as bulk density and penetration resistance. Bulk density and penetration resistance values under different tillage residue retention level under rice-maize cropping systems was below the critical value regarded as sufficient to promote the growth and development of crops.

Keywords: Bulk density, Penetration resistance, Minimum tillage, Unpuddled transplanting, Zero tillage, Strip tillage, Bed planting, Residue retention

Location: BRRI Regional Station, Rajshahi

Start Date: 00-07-2011

End Date: 00-06-2012

Program Area: Farm Mechanization

Commodity: Land management

Objectives:

To investigate the effects of various tillage practices and residue retention on physical properties of soil

Methodology:

The experiment was laid out in a strip plot design with tillage options as main plot and crop residue retention as subplot with three replications. The sequence of treatment imposition was given below. For rice A. Tillage options Puddled CT = Conventional tillage SPWT = Single pass wet tillage Unpuddled BP = Bed formed by VMP ST= Strip tillage by VMP For maize A. Tillage options CT = Conventional tillage ZT = Zero tillage by VMP BP = Bed formed by VMP ST = Strip tillage by VMP B. Residue incorporation C1 = 100% crop residue retention C2 = 50% crop residue retention C3 = 0% crop residue retention Soil sample collection: Cores of undisturbed soil (0-7.5 cm and 7.5-15 cm layers) were taken with a 7.5 cm long cylinder made from cold rolled steel tubing having a 5.6 cm inside diameter. One end of the cylinder was sharpened to a knife edge. The cylinder was forced into the soil (by pounding on a piece of wood placed over the cylinder when the cylinder could no longer be manually forced into the soil) until the top edge of the cylinder was level with the adjacent ground surface. The core then was removed with a tiling spade, the cutting knife inserted, excess soil trimmed off the bottom edge, and the 0 to 7.5 and 7.5 to 15 cm cores gently placed into separate containers. Bulk density: Soil samples were oven dried in the laboratory for the calculation of bulk density and total porosity using methods described by Blake and Hartge, 1986, Danielson and Sutherland™, respectively. Soil strength: Hand penetrometer was used to measure the soil penetration resistance (Model: Ejkelkemo, Serial no. 27180909, Netherlands).

Source of Information: BRRI Annual Research Review, 2011-12, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government	Budget:
2.	Budget:

Total Budget (Tk.) :

Achievement/Findings:

Bulk density and penetration resistance increases as the depth increases in both crops. Values of bulk density and penetration resistance were below the critical level and did not restrict the crop stand. In three years study, tillage and residue retention showed no significant effect on some of soil physical properties i.e. bulk density and penetration resistance in rice-maize cropping system.

Knowledge Management: Report/Proceedings