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Long-term Missing Element Trial at BRRI Farm

S. M. Mofizul Islam
Scientific Officer
Soil Science Division, BRRI Gazipur

A. Latif Shah
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

It appears from the result that the intensity of yield decreased was more with N & K omission in both T.Aman and Boro season. Higher yield decrease was observed in Boro than T.Aman season due to omission of P fertilizer. Increase rate of K along with 18 kg N/ha than previous complete fertilizer treatment dose increase yield was found in the experimental condition.

Keywords: Missing nutrient element, Poultry manure, Cowdung, Oil cake, Saw dust, Mixed manure, STB

Location: BRRI farm, Gazipur

Start Date: 01-07-2011

End Date: 30-06-2012

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To monitor the changes of the soil fertility status due to fertilizer addition/omission and organic source addition.

Methodology:

The experiment was initiated on a permanent layout at the BRRI farm Gazipur in 1985 Boro season. Since Boro 2000, each plot was split to include a reverse treatment, and additional varieties, BRRI dhan29 and BRRI dhan31 to evaluate the reverse trends of missing elements. In Boro season NPKSZn @ 120-25-35-20-5 kg/ha was used but in T.Aman season it was 100-25-35-20-5 kg/ha. After the 47 th crop, the treatments were modified with the omission of Zn fertilizer. Again in Boro 2009-10, organic materials were used as third modification in T5, T8, T9 T10 and T11 treatment. Different sources of organic materials were used in selected treatment such as oil cake (OC) (2 t/ha), saw dust (SD) (3 t/ha), cow dung (CD) (3 t/ha), mixed manure (CD: PM: SD: OC= 1:1:1:0.5) and poultry manure (PM) (2 t/ha) in T10, T9, T5, T11 and T8 treatment and rest of the treatment keep as previous. Only N @ 138 kg/ha was applied as top dress. Again in Boro 2011-12, chemical fertilizers were used as fourth modification in T9 and T11 treatment instead of organic sources. Sixty kilogram of potassium was used in T9 and 40 kg K in T11 with NPSZn dose as complete treatment (T1) to observe the change of soil exchangeable K over time. Original treatment, 1985 Reserve treatment, 2000 Treatment, 2009-10 Treatment, 2011-12 NPKSZn All missing NPKSZn NPKSZn@138-7-80-3-5 kg/ha NPSZn(-K) NSZn(+K) NPSZn(-K) -K NKSZn(-P) NKSZn(+P) NKSZn(-P) -P PKSZn(-N) PKSZn(+N) PKSZn(-N) -N NSZn(-PK) NSZn(+PK) Cow dung@3.0 t/ha Cow dung(3 t/ha)+IPNS chem. fert. NPKS(-Zn) NPKS(+Zn) NPKS(-Zn) -Zn NPKZn(-S) NPKZn(+S) NPKZn(-S) -S NPK(-SZn) NPK(+SZn) Poultrymanure@ 2t/ha Poultry manure (2t/ha)+IPNS chem. fert NP(-KSZn) NP(+KSZn) Saw dust @3t/ha NPKSZn. @ 138-7-60-3-5 kg/ha NK(- PSZn) NK(+PSZn) Oilcake@2.0 t/ha Oil cake (2t/ha)+IPNS chem. fert N(-PKSZn) N(+PKSZn) Mixed Manure NPKSZn @138-7-40-3-5 kg/ha All missing + NPKSZn Control Control

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2011- 2012

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Omission of each major nutrient (N, P & K) from complete treatment decreased yield significantly than complete treatment (NPKSZn) in both Boro and T.Aman season with a exception of P in T.Aman season. The omission of S & Zn did not decrease yield due to its higher availability in soil. When different organic sources were applied only in T₅ (-PK), T₈ (-SZn), T9 (-KSZn), T₁₀ (-PSZn) and T₁₁ (-PKSZn) treatments, yield level remains below than complete treatment but higher than that of control plot except saw dust in T.Aman season. It might be the reason that the higher carbon and nitrogen ratio of saw dust causes N immobilization in soil. The trend of grain yield decrease during Boro 2012 due to omission of major nutrients has a similarity with previous Boro 2011 results. It appears that addition of 60 kg K/ha with other nutrients as per complete fertilizer treatment produced higher yield than 40 kg K/ha with the same other fertilizer, which was statistically similar as longer period of complete fertilizer treatment. It means longer period of K omission in soil required higher rates of K fertilizer. It also noted that in Boro 2007 when soil test based fertilizer dose was determined in this experiment the K rate was fixed at 80 kg K/ha with additional increment of 18 kg N/ha produced yield similar as experimental inception yield (Boro 1985).

Knowledge Management: Report/Proceedings