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Optimizing Leaf Color Chart (lcc) with the Aid of Chlorophyll Meter (spad)

S. S. Parul
Training Division, Bangladesh Rice Research Institute, Gazipur – 1701, Bangladesh.

Abstract/ Executive Summary:

The study was conducted to find out a relationship of SPAD meter reading and LCC value in respect of grain yield in BRRI dhan28 and BRRI dhan29. The treatments were SPAD 35, 37 and 40 with 30 kg ha^-1 N in each application. The control plot did not receive any additional nitrogen. Both SPAD and LCC readings were taken at the same date and time with same leaf but the N was applied on the basis of SPAD reading only. Field experiment was conducted at the research farm of BRRI, Gazipur during Boro season of 2003 with BRRI dhan28 and BRRI dhan29 as test varieties. Rice leaf greenness was observed weekly starting from 24 to 94 DAT during the growing season and N fertilizer was top dressed when leaf chlorophyll went below certain levels on the SPAD meter reading. The BRRI recommended three split N fertilizer application schedule served as the control treatment. Rice grain yield and N use efficiency parameters were used as indicators of efficiency of the N management techniques. A strong positive relationship between SPAD meter reading and LCC value was observed with R² = 0.8538 for BRRI dhan28 and R² = 0.8746 for BRRI dhan29.

Keywords: BRRI dhan28, BRRI dhan29, LCC, Nitrogen and SPAD

Location:

Start Date: 10-11-2002

End Date: 01-05-2003

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1.To determine the optimum LCC value with the aid of SPAD meter value for Boro rice

2. To find out the relationship between LCC and SPAD value.

Methodology:

The field experiment was conducted in Boro season of 2003. The seeds of BRRI dhan28 and BRRI dhan29 were sown in the seed bed on 10 November 2002 and 43-day-old seedlings were transplanted. Except the N which was considered with the treatments, all other cultural and management issues were taken care of for growing an ideal crop.The Treatments were N-fertilization at 3 different levels of SPAD meter readings, a control (no N) and BRRI recommended N dose. Three SPAD-based N management practices (SPAD₃₅, SPAD₃₇ and SPAD₄₀), an N control and BRRI recommended N dose were compared for BRRI dhan28 and BRRI dhan29. In this study, both SPAD and LCC readings were taken at the same date and time with same leaf but the N was applied on the basis of SPAD reading only. The experiment was laid in RCB design with four replications. A detailed description of the treatments is given below:

T₁= N-control (Zero N)

T₂= BRRI recommended N

(Optimum N-dose recommended by BRRI)

T₃= SPAD₃₅ based N management

(N was applied @ 30 kg ha^-1 when SPAD meter reading became ≤ 35).

T₄= SPAD₃₇ based N management

(N was applied @ 30 kg ha^-1 when SPAD meter reading became ≤ 37).

T₅= SPAD₄₀ based N management

(N was applied @ 30 kg ha^-1 when SPAD meter reading became ≤ 40).

The SPAD meter readings were collected at seven days interval starting from 24 days after transplanting and continued up to 87 DAT. SPAD readings were taken at 24, 31, 38, 45, 52, 59, 66, 73, 80 and 87 DAT for both the test varieties. Nitrogen (as prilled urea) was applied @ 30 kg N ha^-1 when the mean SPAD readings were found equal or below the predefined threshold levels. Treatments T₃_,T₄ and T₅ received a basal N application of 10 kg ha^-1. In addition to SPAD, LCC readings were taken from the same leaves on the same dates and almost the same time.

Source of Information: J. Patuakhali Sci. and Tech. Univ. 2010, 2(1):63-70

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A strong positive relationship between SPAD meter reading and LCC value was observed with R² = 0.8538 for BRRI dhan28 and R² = 0.8746 for BRRI dhan29.The LCC and SPAD offered a good opportunity to decrease the amount of N fertilizer use and to increase the N use efficiency in the rice fields of Bangladesh. Through these studies the recommendation of LCC value and SPAD meter reading became more specific for BRRI dhan28 and BRRI dhan29 rather than a generalized recommendation for BRRI released Boro varieties in Bangladesh.

Knowledge Management: Journal