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Effect of Different Levelsof Potassium Supplied from Two Different Sources on the Growth and Yield of Rice (cv. BRRI Dhan49)

A Huda*
Department of Soil Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

M RIslam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

K Sumi
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An experiment was carried out during T. aman season of 2014 at Soil Science Field Laboratory of the Department of Soil Science, Bangladesh Agricultural University, Mymensingh to study the effect of different levels of potassium supplied from two different sources on the growth and yield of rice variety BRRI dhan49. The experiment was laid out in a randomized complete block design with three replications having 5 m × 4 m unit plot size. There were seven treatment combinations viz. Control i.e K 0 kg ha^-¹ (T1), K 40 kg ha^-1 as MoP (T2), K 50 kg ha^-1 as MoP (T3), K 60 kg ha^-1 as MoP (T4), K 40 kg ha^-1 as K2SO4 (T5), K 50 kg ha^-1 as K2SO4 (T6) and K 60 kg ha^-1 as K2SO4 (T7) in the experiment. Basal dose of fertilizers @ 100 kg N, 15 kg P, 12 kg S and 2 kg Zn ha^-¹ were applied from urea, TSP, gypsum, zinc oxide, respectively for all treatments. The full doses of MoP were applied as per treatments. The results revealed that growth and yield contributing characters like plant height, number of tillers hill^-1, panicle length, grains panicle-1and 1000-grain weight responded significantly to different levels of applied K. The grain and straw yields of BRRI dhan49 were also significantly influenced due to different treatments. The highest grain yield of 4.9 t ha^-1 and straw yield of 5.0 t ha-1were obtained in T4 which was statistically similar to T3.The lowest grain yield of 3.5 t ha^-1 and straw yield of 3.9 t ha^-1 were found in T1. The K content and uptake by grain and straw were also higher in the treatment T4. The potassium supplied from MoP performed better than that supplied from K2SO4. Hence, the application of K @ 50 kg ha^-1 as MoP may be recommended for successful cultivation of BRRI dhan49.

Keywords: Potassium, Growth, Yield, BRRI dhan49.

Location: Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-2014

End Date: 00-12-2014

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Rice

Objectives:

To evaluate the effect of different levels and sources of potassium on the growth and yield of rice cv. BRRI dhan49.

Methodology:

The experiment was carried out in the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during T. aman season in 2014. The study was performed to evaluate the effect of different levels of potassium supplied from two different sources on the growth and yield of rice. The soil of the experimental site belongs to the Sonatala series under the AEZ of Old Brahmaputra Floodplain. The soil was silt loam in texture having pH 6.7, organic matter 2.70%, total N 0.141%, available P 4.2 ppm, exchangeable K 0.09 meq% and available S 14.9 ppm. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications of each treatment. There were seven treatments in the experiment. Three rates of K; 40, 50 and 60 kg ha-1 from muriate of potash (MoP) and potassium sulphate (K₂SO₄) were used in the experiment. The treatment combinations were T1 -Control i.e. K 0 kg ha^-1, T2 -K 40 kg ha^-1 as MoP, T3 -K 50 kg ha^-1 as MoP, T4 -K 60 kg ha^-1 as MoP, T5 -K 40 kg ha^-1 as K2SO4, T6 -K 50 kg ha^-1 as K2SO4 and T7 -K 60 kg ha^-1 as K2SO4. The variety was BRRI dhan49 which is widely grown in Bangladesh. The unit plot size was 5m x 4m. Thirty-four days old seedlings of BRRI dhan49 were transplanted in the experimental plots on 1 August 2014 maintaining spacing at 20 cm x20 cm. Three seedlings were planted hill^-1. All the treatments received a basal dose of 100 kg N, 15 kg P, 12 kg S and 2 kg Zn ha^-¹ from urea, TSP, gypsum and zinc oxide, respectively as per soil test basis (FRG, 2012). Full amount of TSP, MoP, gypsum and zinc oxide along with K as per treatments were applied during final land preparation. Urea was applied in three equal splits. The first split was applied during final land preparation, the second split was in active tillering stage and the third one was in panicle initiation stage. Different intercultural operations such as irrigation, weeding, pest control etc. were done as and when required. The crop was harvested plot wise at full maturity and the data on plant height, panicle length, number of effective tillers hill^-1, number of filled grains panicle^-1, 1000 grain weight, grain and straw yields were recorded. Five hills from each plot were sampled randomly for agronomic data collection prior to harvest. The grain and straw samples were analyzed for K content and uptake. All the data were statistically analyzed by F-test and the mean differences were adjudged by Duncan’s Multiple Range Test (DMRT) (Gomez and Gomez, 1984) at 5% level of significance using statistical package MSTAT-C.

Source of Information: J. Sylhet Agril. Univ. 3(1):25-29, 2016 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study suggests that application of K @ 60 kg ha^-¹ as MoP is luxurious for maximized grain yield of BRRI dhan49. Hence, among the potassium fertilizer treatments, the T3 i.e. K 50 kg ha^-1 as MoP may be recommended for optimum grain yield of BRRI dhan49 in the Old Brahmaputra Floodplain.

Knowledge Management: Journal