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Measurement of Soil Moisture Depletion Rate in Irrigated Rice Field-2007

Dr. M A Rashid
CSO and Head
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted at BRRI farm Gazipur during T Aman, 2006 and Boro 2006-07. Data was collected on soil texture, bulk density of the soil, water status, rainfall, soil moisture content, variety and yield. Total water supply was recorded for determination of water requirement. Irrigation water was supplied after 3, 4 and 5 days of disappearing of standing water. Soil moisture content was measured everyday after disappearing of standing water until next irrigation. Soil samples were collected from 0-15 cm and 15-30 cm depth. Treatments were-T₁ = Daily soil moisture measurement for 3 days after disappearing of standing water, T₂ = Daily soil moisture measurement for 4 days after disappearing of standing water, T₃ = Daily soil moisture measurement for 5 days after disappearing of standing water, T₄ = Continuous standing water (5-7 cm). The soil moisture content in rice field after disappearing of standing water for the two seasons for the plots of treatments T₁, T₂ and T₃ . The moisture content was expressed in percentage of oven dry soil on weight basis. During T. Aman season, the average soil moisture content (average of 3 treatments) were 53.9%, 51.0% and 49.2% after 1^st, 2^nd and 3^rd day of disappearing standing water, respectively, at a soil depth of 0-15 cm and the corresponding soil moisture for the depth of 15-30 cm were 53.7%, 51.5% and 49.2% respectively. So, the soil moisture depletion rate per day was 2 – 3%. Frequent rainfall during T Aman season caused standing water in the plot which stopped collection of soil sample on 4^th and 5^th day of disappearing standing water. In Boro season, the average soil moisture content at a depth of 15 -30 cm were 54.6%, 51.6%, 47.3%, 43.4% and 38.8% after 1^st, 2^nd, 3^rd, 4^th and 5^th day of disappearing standing water, respectively and the moisture content for the soil depth of 15-30 cm were 48.3%, 44.6%, 40.6%, 36.5% and 35.5% after 1^st, 2^nd, 3^rd, 4^th and 5^th day of disappearing standing water, respectively. So, in Boro season the soil moisture depletion rate per day was 3-5%. The moisture content of bottom layer was slightly lower than that of the upper layer.

Keywords: Soil moisture depletion, Moisture content, Water requirement

Location: BRRI farm, Gazipur

Start Date: 00-00-2006

End Date: 00-00-2007

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

To determine the soil moisture depletion rate in unsaturated soil condition, and
To quantify irrigation requirements for rice.

Methodology:

The experiment was conducted at BRRI farm Gazipur during T Aman, 2006 and Boro 2006-07. Data was collected on soil texture, bulk density of the soil, water status, rainfall, soil moisture content, variety and yield. Total water supply was recorded for determination of water requirement. Irrigation water was supplied after 3, 4 and 5 days of disappearing of standing water. Soil moisture content was measured everyday after disappearing of standing water until next irrigation. Soil samples were collected from 0-15 cm and 15-30 cm depth. Treatments were-T₁ = Daily soil moisture measurement for 3 days after disappearing of standing water, T₂ = Daily soil moisture measurement for 4 days after disappearing of standing water, T₃ = Daily soil moisture measurement for 5 days after disappearing of standing water, T₄ = Continuous standing water (5-7 cm).

Source of Information: Proceedings of the BRRI Annual Review for 2007, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

During T. Aman season, the average soil moisture content (average of 3 treatments) were 53.9%, 51.0% and 49.2% after 1^st, 2^nd and 3^rd day of disappearing standing water, respectively, at a soil depth of 0-15 cm and the corresponding soil moisture for the depth of 15-30 cm were 53.7%, 51.5% and 49.2% respectively. In Boro season, the average soil moisture content at a depth of 15 -30 cm were 54.6%, 51.6%, 47.3%, 43.4% and 38.8% after 1^st, 2^nd, 3^rd, 4^th and 5^th day of disappearing standing water, respectively and the moisture content for the soil depth of 15-30 cm were 48.3%, 44.6%, 40.6%, 36.5% and 35.5% after 1^st, 2^nd, 3^rd, 4^th and 5^th day of disappearing standing water, respectively.

Knowledge Management: Report/Proceedings