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Rice Stubble Manure as Organic K Fertilizer

Pranesh Kumar Saha
Principle Scientific Officer
Soil Science Division, BRRI Gazipur

Masuda Akhter
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

M Abdul Mazid Miah
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

S. Kaiser Zaman
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The application of 4.5 t/ha rice straw could substitute chemical K (66 kg K/ha/season) requirement of rice. In addition to K supplement, continuous rice straw application results in an increase of soil organic matter (0.74% in 5 years) in rice – rice cropping pattern.

Keywords: Rice stubble, Potassium, Organic matter

Location: BRRI farm, Gazipur (AEZ 28, Madhupur Tract, Medium High Land)

Start Date: 01-07-2007

End Date: 30-06-2008

Program Area: Crop-Soil-Water Management

Commodity: Manures

Objectives:

1. to find out the appropriate dose of K fertilizer in soils of the investigated area for existing cropping pattern 2. to find out the alternative source of K for wet land rice cultivation.

Methodology:

Six doses of potassium were tested. These were: K control (K0), 33 kg K/ha (K33), 50 kg K/ha (K50), 66 kg K/ha (K66), farmers’ K fertilizer rates based on 25 local farmers (KFP) and recycling of rice straw (4.5 t/ha as oven dry basis) but no K fertilizer (K0 + CR). The soil test based flat doses of N, P, S and Zn was applied in all the plots. Nitrogen fertilizer was applied in 3 equal splits (1/3 N as basal, + 1/3 N at active tillering stage (ATS) + 1/3 N at 7 days before panicle initiation (PI) stage). All other fertilizers (P, K, S & Zn) were applied at the final land preparation. Rice straw of the previous crop @ 4.5 t/ha as oven dry basis were incorporated into soil 10-14 days before transplanting. Thirty day old seedling in T.Aman and 40 day old seedling in Boro were transplanted at 20 cm X 20 cm spacing. The tested cropping pattern was Boro-fallow-T. Aman. In T .Aman season BRRI dhan31 and in Boro season BRRI dhan29 were tested. The experiment was laid out in a RCB design with 4 replications. At maturity, the crop was harvested 5 m2 areas at the centre part of each plot and 16 hills were collected for straw yield. The grain yield was recorded at 14% moisture content and straw yield as oven dry basis. Potassium content from plant samples were determined by standard analytical procedure.

Source of Information: Proceedings of BRRI Annual Internal Review, 2008-2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A significantly positive change in soil organic matter status was observed in those treatments where higher doses of K from inorganic or organic sources were applied through the 5 years in a Rice-fallow-Rice cropping sequence. The status of initial soil organic matter was 2.02%. After 5 years in K-control plot it decreased up to 1.72%. It significantly increased up to 2.05% at 66 kg K/ha, up to 2.21% at farmers’ fertilization practice and up to 2.76% at rice straw incorporation plot over K-control plot. No perceptible changes in soil exchangeable K status occurred through the 5 year use of organic and inorganic K fertilizer in a Rice-fallow-Rice cropping sequence

Knowledge Management: Report/Proceedings