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Effect of K Rates on the Yield of BRRI Mv Rice Varieties

M. Nazrul Islam
Scientific Officer
Soil Science Division, BRRI Gazipur

Farjana Alam
Scientific Officer
Soil Science Division, BRRI Gazipur

Pranesh Kumar Saha
Pranesh Kumar Saha
Soil Science Division, BRRI Gazipur

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

Abstract/ Executive Summary:

Objective of this study was to find the K response of BRRI released lines/varieties and determine the status of available K in different soil layer. The experiment was conducted on a long-term permanent K response plot both in T. Aman (24th crop) and Boro seasons (25th crop) at BRRI farm, Gazipur. The initial soil available K at surface layer was 0.18 meq/100g at starting of the experiment Boro 2003. In T. Aman season, BRRI dhan49 produced maximum yield at the K rates of 50 kg/ha while in Boro season it was 100 kg/ha for BRRI dhan28. Soil available K deposited at the lower layer.

Keywords: K response, Optimum dose, Economic dose

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2012

End Date: 30-06-2013

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To find the K response of BRRI released lines/varieties
To determine the status of available K in different soil layer

Methodology:

The experiment was conducted on a long-term permanent K response plot both in T. Aman (24th crop) and Boro seasons (25th crop) at BRRI farm, Gazipur. The initial soil available K at surface layer was 0.18 meq/100g at starting of the experiment Boro 2003. The available K status in soil ranged from 0.19 to 0.22 meq/100g soil after the harvest of T. Aman 2012. In T. Aman and Boro season K rates were 0, 50, 100, 150 and 200 kg/ha. The design of the experiment was RCB. Each plot received a blanket dose of NPS@ 145-25-24 kg/ha and 97-15-14 kg/ha in Boro and T. Aman seasons, respectively. The test varieties were BRRI dhan49 and BRRI dhan28 in T. Aman and Boro season, respectively.

Source of Information: Proceedings of BRRI Annual Internal Review for 2012- 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A significant yield increase was observed with the application of 50 kg K/ha than K control plot but beyond that rate increase of grain yield was not observed. The highest grain yield (4.80 t/ha) was found in the treatment K150, which was statistically similar with the treatments K50, K100 and K200. The lowest grain yield (3.68 t/ha) was found with the K control plot. The grain yield of BRRI dhan49 increased with increased K rates up to 150 kg/ha. The optimum K rate for BRRI dhan49 was 108 and the maximum yield benefit 114 kg/ha respectively. Like T. Aman, significant effect of different dose of K rates on grain and straw yield was found over K control plot. The highest grain yield (5.51 t/ha) was found in the treatment K100. The lowest grain yield (3.48 t/ha) was found with the K control plot. The grain yield of BRRI dhan28 increased with increased K rates up to 100 kg/ha beyond this rate the grain yield decreased gradually. At Boro season, the optimum K rate for BRRI dhan28 was 115 and the maximum yield benefit 127 Kg/ha respectively. There was no significant effect of different K doses on soil available K at 0-15 cm and 15-30 cm soil layer. But at 30-45 cm soil layer, there was a significant effect of K100 and K150 level over K0. The value of soil available K at these levels was higher at 30-45 cm layer than that of 0-15 cm and 15-30 cm layers i.e. soil available K (meq/100g soil) was deposited in the lower layer.

Knowledge Management: Report/Proceedings