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Efficiency of Lpns-based Chemical Fertilizer Application in Wet Land Rice

P.K. SAHA
Principal Scientific Officer
Soil Science Division, BRRI, Gazipur-1701

M.A. M. MIAH
Chief Scientific Officer
Soil Science Division, BRRI, Gazipur-170l.

Abstract/ Executive Summary:

A field trial was conducted to validate some fertilizer application approaches for Boro-Green manure (GM) -T. Aman cropping system at the Bangladesh Rice Research Institute (BRRI) Farm, Gazipur (AEZ-28: high land) during the period from Boro 1999-2000 to T. Aman 2000. Five different application approaches of inorganic and organic fertilizers along with their residual values were evaluated. A positive effect of GM on the yield of T. Aman rice was observed. Application of cowdung (CD)@ 6 t/ha (at 15 %moisture) along with integrated plant nutrient system (lPNS) based chemical fertilizer in Boro season followed by green manuring with dhaincha (in Kharif-1 season) and then growing T. Aman rice (in Kharif-11 season) with reduced doses of chemical fertilizer (60% N, 50% P, 50% K, and 50% S) substantially increased grain yield and narrowed down the N, P, and K balance in soil. This fertilizer application approach may be practiced for sustainable crop production. No appreciable yield loss in T. Aman rice (2nd crop) occurred due to the application of reduced doses of P, K, S, and Zn indicating the beneficial residual effect of fertilizer applied to the first crop (Boro rice) of the cropping pattern. The N uptake was in excess of the N added as fertilizer. An improved balance of P, S, and Zn was observed. But the K balance was negative. However, application of cowdung and incorporation of dhaincha slightly improved the K balance of the soil. The highest gross return of Tk. 86,270 was obtained with the above practice (treatment T₄).

Keywords: IPNS based chemical fertilizer application, Dhaincha, Wet land rice

Location: Bangladesh Rice Research Institute (BRRI)Farm, Gazipur

Start Date: 00-00-1999

End Date: 00-00-2000

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the IPNS-based chemical fertilizer application approach.

Methodology:

A field trial with Boro-GM-T. Arnan cropping pattern was conducted at the BRRI Farm, Gazipur (AEZ-28; high land) during the period of Boro 1999-2000 to T. Aman 2000. The experiment was laid out in a randomized complete block design with three replications. The treatment combinations for the first crop (Boro) of the cropping pattern were, no fertilizer (T₁) BARC recommendation as FRG, 1997 (T₂), soil test based (STB) (_T3), CD at the rate of 6 t/ha (at 15% moisture)+ lPNS based chemical fertilizers (T₄), and local farmers' practice (based on interview of 10/15 local farmers) (FP) (T₅). In Kharif-1, each original plot under treatments T₂, T₃ and T₄ was divided into four sub-plots. The treatments were No GM for T ₁ T_2a T_3a T_4a and T₅ and GM for rest of the treatments. Dhaincha (S. aculeata) was the second crop (Kharif I) as a green manure. In T. Arnan, the treatments for these sub-plots were full inorganic fertilizer doses as for the first crop without green manure (T_2a/Ja/4a), full inorganic fertilizer doses plus green manure (T_2b_/3b/4b), 60% N and 50% other nutrients plus green manure (T2_c_/3c/4c), and 60% N only plus green manure (T_2d_/3d/4d). Chemical fertilizers were applied to each crop (except dhaincha) as per treatments following the usual procedure. In Boro,BRRI dhan29 and in T. Aman, BRRI dhan31 were tested with 20 cm x 20 cm spacing. BRRI dhan29 and in T. Aman, BRRI dhan-31 were tested with 20 cm x 20 cm spacing. In Boro and T. Aman, a portion of straw and grain samples were analyzed for P, K, S, and Zn content by digesting with di-acid mixture of nitric and perchznoric acid at the ratio 5:2 following the method described by Yoshida eta!. (1976) and N by Micro-Kjeldahl distillation method (Yoshida eta/., 1976). Statistical analyses were performed and means were compared by DMRT. Economic analyses were done for net benefit and benefit cost ratio for different treatment combinations.

Source of Information: Bangladesh J. Agril. Res. 34( l) : 5-13; March 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

T. Aman rice (in Kharif-11 season) with reduced doses of chemical fertilizer (60% N, 50% P, 50% K, and 50% S) substantially increased grain yield and narrowed down the N, P, and K balance in soil. This fertilizer application approach may be practiced for sustainable crop production. No appreciable yield loss in T. Aman rice (2nd crop) occurred due to the application of reduced doses of P, K, S, and Zn indicating the beneficial residual effect of fertilizer applied to the first crop (Boro rice) of the cropping pattern. The N uptake was in excess of the N added as fertilizer. An improved balance of P, S, and Zn was observed. But the K balance was negative. However, application of cowdung and incorporation of dhaincha slightly improved the K balance of the soil. The highest gross return of Tk. 86,270 was obtained with the above practice (treatment T₄).

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