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Long-term Effect of Conservation Tillage on Soil Chemical 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
Soil Science Division, BRRI

Dr. Md. Mosharraf Hossain
ARD, BRRI

Abstract/ Executive Summary:

In the first year, Initial data of soil K concentration, potassium and nitrogen were recorded at two depth. Data were also recorded at the end of each crops. At the end of the first cropping sequence, at the top layer, the value of soil organic matter (%) for CT, SPWT/ZT, BP, ST was 1.39, 1.35, 1.42, 1.33. The value of soil phosphorus (µg g soil^-1) for CT, SPWT/ZT, BP, ST was 19.14, 12.91, 12.82, 8.79. The value of soil nitrogen for CT, SPWT/ZT, BP, ST 0.07, 0.07, 0.07, 0.06.

Keywords: Minimum tillage, Unpuddled transplanting, Zero tillage, Strip tillage, Bed planting, Residue retention, Potassium, Nitrogen, Phosphorus, Organic matter

Location: BRRI Regional Station, Rajshahi

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Crop-Soil-Water Management

Commodity: Farm machineries, Land management

Objectives:

To investigate the changes on soil chemical properties to develop useful tillage and residue retention system

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 in regional station, Bangladesh Rice Research Institute, Rajshahi. Field experiment involved conventional tillage (CT), single pass wet tillage (SPWT), zero tillage (ZT), bed planting (BP) and strip tillage (ST) with three levels of residue retention (100%, 50% and 0%). In maize season, treatment SPWT was changed to treatment ZT. Rice was grown in wet season (Aman) and maize was grown in dry season (Rabi). In rice cultivation, CT consisted of 2 passes primary tillage by 2 WT and exposed to sun for two days followed by inundating whole plot and puddling by 2WT with 2 passes to complete land preparation. In SPWT, one pass tillage by 2 WT after inundating the field. The land was fully inundated one day before transplanting in unpuddled plots. As per treatment sequence, previous crop residue was spread in between rows of rice and maize at 20 days after transplanting/seeding. Residue incorporation was started after first rice crop. Rice variety BR11 and maize variety NK40 were grown in this experiment. Soil samples were taken randomly in three places in subplots between rows of crops and top of bed at two depths for chemical analysis. Chemical analysis was done in Soil Resource Development Institute (SRDI) laboratory, Rajshahi. Soil total N was determined following procedure of semi-micro Kjeldahl method. The content of available P was determined by Olsen method (Olsen et al., 1954). Phosphorus was determined colorimetrically (Murphy and Riley, 1962). Soil exchangeable K was determined by 1 M ammonium acetate extraction method.

Source of Information: FMPHT Division Report, 2010

Article Link (Online Journal):

Funding Source:

1.	Budget:
2. Government	Budget:

Total Budget (Tk.) :

Achievement/Findings:

At the end of the first cropping sequence, at the top layer, the value of soil organic matter (%) for CT, SPWT/ZT, BP, ST was 1.39, 1.35, 1.42, 1.33. The experiment need to be continued for the second season in rice-maize cropping sequence

Knowledge Management: Report/Proceedings