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Effect of Different Doses of Potassium for Maximized Potato Production

M.H. Rahman
Soil Science Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh

M.H. Rahman
Soil Science Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh

M.Q. Haque
Soil Science Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh

Abstract/ Executive Summary:

Experiments were carried out at BINA substation, Comilla and farmer's field, Kaonia, Rangpur during 2003-2004 and 2004-2005 to evaluate the effect of different level K on the yield of potato. The experiments were laid out in a randomized complete block design with five treatments in three replications. The treatment combinations were T₁: K₀, T₂: K₃₀, T₃: K₆₀, T₄: K₉₀, T₅: K₁₂₀, and T₁: K₀, T₂: K₂₄, T₃: K₄₈, T₄: K₇₂, T₅: K₉₆ respectively. The average tuber yield of potato varied from 15.62 to 24.70 t ha-1 and the highest yield recorded in the treatment T5; while lowest in T1 (control) in Comilla. On the other hand, the average tuber yield of potato ranged from 19.74 to 27.73 t ha-1 in Rangpur with the maximum yield observed in T₅ treatment and minimum in control (T₁). In both the locations N, P, K and S uptake by tuber were highest in T₅ and the lowest in T₁ treatment. The highest gross margin of Tk. 83,644 ha^-1and Tk. 1,31,149 ha^-1 were obtained in treatment T₅ at Comilla and Rangpur, respectively.

Keywords: Potassium, Potato, Soil

Location: BINA substation, Comilla and farmer's field, Kaonia, Rangpur

Start Date: 00-00-2003

End Date: 00-00-2005

Program Area: Crop-Soil-Water Management

Commodity: Potato

Objectives:

1. To determine the optimum and profitable dose of K fertilizer for potato production at varied K levels soil.

Methodology:

The experiments were conducted with potato var. Diamond in Rabi season during the period from 4th week of November to 4th week of March 2003-2004 and 2004-2005 for two years at BINA substation, Comilla and farmer's field, Kaonia, Rangpur simultaneously to assess the response of potato as a test crop to added K. Fertilizers were applied as soil test basis. The experiments were laid out in a randomized complete block design with five treatments including K control and each replicated thrice. Treatments for comilla location ( K deficient soil) were T₁ : Without K + Full dose of NPSZn, T₂: 25% of estimated K (30 kg K) + Full dose of NPSZn , T₃: 50% of estimated K (60 kg K) + Full dose of NPSZn, T₄: 75% of estimated K (90 kg K) + Full dose of NPSZn, T₅: 100% of estimated K (120 kg K) + Full dose of NPSZn and treatments for Rangpur site (medium k level soil) were T₁ : Without K + Full dose of NPSZn, T₂: 25% of estimated K (24 kg K) + Full dose of NPSZn , T₃: 50% of estimated K (48 kg K) + Full dose of NPSZn, T₄: 75% of estimated K (72 kg K) + Full dose of NPSZn, T₅: 100% of estimated K (96 kg K) + Full dose of NPSZn. All fertilizers except N were applied at the time of final land preparation. Nitrogen fertilizer was applied in two equal splits. A blanket doses of fertilizer N₁₃₀ P₁₀ S₁₅ Zn₃ and N₁₃₀ P₂₅ S₁₅ Zn₃ B₁ kg/ha was applied at Comilla and Rangpur sites respectively. In both locations the seed rate of potato was 2000 kg/ha. The seeds of potato were sown in 4th week of November and harvested in 4th week of March. Irrigation and intercultural operations were done as and when necessary.

Source of Information: J. Agrofor. Environ. 4 (2): 163-165, 2010; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The amounts of N, P, K and S uptake by potato was affected by different rates of potassium. Nutrients uptake increased with increase of yield. Potassium application remarkably increased uptake of potassium and other nutrients in both test locations. In Comilla, result demonstrated that the highest gross margin of Tk. 83,644/ha was obtained in treatment T₅ followed by Tk. 78,194/ha in T₄. Another attempt has been made to find out the marginal benefit cost ratio (MBCR) of the treatments. The highest MBCR (21.68) was obtained in T₄ followed by 19.70 and 20.58 in T₃ and T₅treatments. In Rangpur, the highest gross return of Tk. 1,31,149/ha was obtained in treatment T₅followed by Tk. 1,14,829/ha in T₄ and Tk. 1,11,709/ha in T₃ respectively. The highest MBCR (22.85) was obtained in T₂ followed by 22.49 in T₃ and 21.37 in T₅treatments.

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