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Comparative Study of Different Application Methods of Potassiumon in Aroid

F S Shikha
Regional Agricultural Research Station, BARI, Jamalpur

M Yasmin
Regional Agricultural Research Station, BARI, Jamalpur

M A Rahman
Regional Agricultural Research Station, BARI, Jamalpur

S Akhter
Regional Agricultural Research Station, BARI, Jamalpur

Abstract/ Executive Summary:

A field trial was conducted at Regional Agricultural Research Station (RARS), Jamalpur during the period of 2017-2018 with the objectives to study the effect of basal and top dress application of Potassium on quality of aroid and to increase the yield of aroids through Potassium management. There were seven treatments comprising T₁= 100 % K of Recommended Dose of Chemical Fertilizer (RDCF) as basal, T₂= 100 % K of RDCF as top dress (one split), T₃ = 50 % K of RDCF as basal + 50 % K of RDCF as top dress (two splits, T₄ = 50 % K of RDCF as basal + 50 % K of RDCF as top dress (three splits), T₅ = 50 % K of RDCF as basal + 50 % K of RDCF as top dress (four splits), T₆ = Farmer’s practice, T₇ = Native fertility. The experiment was laid out in a randomized complete block design with three replications.The yield attributes and yield of aroids were increased through Potassium management. The highest stolon yield (27.81 t ha^-1) and highest rhizome yield (27.65 t ha^-1)was found in T₅ = 50 % K of RDCF as basal + 50 % K of RDCF as top dress (four splits) treatment, which was significantly higher than the other treatments. The treatment T₆ = Farmer’s practice (CD_{20 t} N_270.00P_50.00K_263.00S_20.00kg ha^-1) showed the second highest yield (26.58 t ha^-1). The lowest stolon yield (8.34 t ha^-1) was in the control.

Keywords: Agro-Ecological Zone, Potassium, Aroid

Location: Regional Agricultural Research Station (RARS), BARI, Jamalpur

Start Date: 00-00-2017

End Date: 00-00-2018

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Aroids

Objectives:

This study was undertaken to evaluate the relative cost and return in Aroid production as influenced by different application methods of Potassium fertilizers.

Methodology:

The experiment was started in 2017-18 period at the field of Regional Agricultural Research Station (RARS) under Jamalpur district in Bangladesh. Before initiation the experiment, the soil samples were collected from a depth of 0-20 cm for each replication and analyzed following standard methods. The chemical properties of soils in the experimental site was silt clay loam in texture belonging to Sonalata series under Agro-Ecological Zone-8 and 9 (AEZ-8 and 9), 24?56´11´´N latitude and 89?55´54´´E longitude and an altitude of 16.46m. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Cowdung, Urea, triple superphosphate (TSP), muriate of potash (MoP) and gypsum, Zinc Sulphate and Boric acid were used as the sources of N, P, K, S, Zn and B respectively. The entire quantities of phosphorus, sulphur , Zinc and Boron were applied before planting and mixing into the soil. Nitrogen was applied in six splits (starting, at 60 DAP (days after planting) and then rest of 15 days intervals). The Potassium were applied in two splits (equally as basal and 60 DAP) The application methods and doses of Muriate of Potash was followed as per treatment. In the farmers practice, cowdung was applied in two times(half as basal and rest half applying after rainy season). On the other hand, Urea and MoP were applied every time of after weeding. Swamp taro (Colocasia esculenta L.) variety of BARI Panikachu - 2 was used as a test crop. The unit plot size was 3 m × 4 m. Seedlings of Swamp taro were planted with a spacing of 60 cm × 45 cm on 11 December of 2017. The stolon was harvested at 60 DAP and harvesting was continued 10 days interval throughout the growing season. The crop (rhizome) was harvested on 15 June,2018. The field was intensively kept free from weeds for the first three months. Standing water of 8-10 cm was maintained in the field. Sometimes, the standing water was shaken and drained out. Dead leaves were removed regularly from the field. In some areas of the field, was infested by Provonia catterpiller and this was controlled by spraying Malathion 57 EC @ 02 ml L^-1 water for 3 times at 15 days interval. Soil samples were collected, dried and ground for chemical analysis. Bulk density was determined by using core sampler Method (Blake, 1965), soil pH by glass electrode pH meter (1:2.5) and organic carbon by wet oxidation method (Walkley & Black, 1935). Total N content of soil was determined by using the Kjeldahl method (Jackson, 1973), whereas available P, exchangeable K and available S contents by using 0.5M NaHCO3 (pH 8.5), NH4OAc and CaCl₂ extraction methods, respectively, as outlined by Page et al. (1982). (These works had been done at the laboratory of Soil Science Division, BARI, Gazipur.). Yield attributes (plant height, number of leaves, number of stolon and stolon length) were recorded from 10 randomly selected plants. Stolon yield per plot was recorded and based on that, per hectare yield was calculated.

Source of Information: Annual Research Report - 2018-19, Regional Agricultural Research Station (RARS), BARI Jamalpur

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The different methods of Potassium fertilizer application showed significant effects on the yield parameters and yield of aroids. The highest stolon yields (27.81 t ha^-1 )and rhizome yield (27.65 t ha^-1) were found in the 50 % K of RDCF as basal + 50 % K of RDCF as top dress (four splits) treatment.This is the first year experiment, the experiment should be repeated to the next year for conformation of the result.

Knowledge Management: Report/Proceedings