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Effect of Nitrogen and Potassium on the Nutrients Content in Summer Onion ( Allium Cepa) and Post Harvest Soil

M. K. Hossain
Assistant Professor
Dept. of Soil Sci., PSTU

Abstract/ Executive Summary:

The highest soil pH, organic carbon, % total N and exchangeable K content in post harvest soil was found in N₁₅₀, K₁₅₀ and N₁₅₀K₁₅₀ treatments.Combined effects of N and K showed significant differences in respect of K content in post harvest soil in Table 3. The K content in the post harvest soil ranged from 0.650 to 1.086 Cmol kg^-1. The highest K content (1.086 Cmol kg^-1) was observed in N₁₅₀K₁₅₀treatment combination and the lowest value (0.650 Cmol kg^-1) was found in control treatment.

Keywords: Nitrogen,Post harvest soil,Potassium, Summer onion

Location:

Start Date: 00-03-2010

End Date: 00-06-2010

Program Area: Crop-Soil-Water Management

Commodity: Onion

Objectives:

To determine the proper doses of N and K fertilizer to optimize the nutrients content of summer onion and post harvest soil.

Methodology:

The experiment was conducted at the Research Farm of Patuakhali Science and Technology University, Dumki, Patuakhali, during March - June 2010 to find out the effects of Nitrogen (N) and potassium (P) application on the nutrient content in summer onion (Allium cepa) and post harvest soil.Three levels of nitrogen (N₀: Control, N₇₅: 75 kg N ha^-1 and N₁₅₀: 150 kg N ha^-1 and 3 levels of potassium K₀: Control, K₇₅: 75 kg K ha^-1 and K₁₅₀: 150 kg K ha^-1) on the nutrient content in summer onion (Allium cepa) and post harvest soil. Nine treatment combinations of nitrogen and potassium levels as follows: T₁ = N₀K₀(Control), T₂ = N₀K₇₅ kg ha^-1, T₃ = N₀K₁₅₀ kg ha^-1, T₄ = N₇₅ K₀ kg ha^-1, T₅ = N₇₅ K₇₅ kg ha^-1, T₆ = N₇₅K₁₅₀ kg ha^-1, T₇ = N₁₅₀ K₀ kg ha^-1, T₈ = N₁₅₀K₇₅ kg ha^-1, T₉ = N₁₅₀K₁₅₀ kg ha^-1. The experiment was laid out in RCBD with three replications. Nitrogen and potassium as the source of Urea and Muriate of potash were applied as per treatments and half of nitrogen and whole of potassium, phosphorus, zinc and sulphur were applied during final land preparation in the form of urea, muriate of potash (M_OP), triple super phosphate (TSP), zinc Sulphate (ZnSO₄) and gypsum (CaSO₄.2H₂O), respectively were applied in the whole plots as basal dose according to the fertilizer recommendation guide (BARC, 2005). Data were collected on the following parameters- N and K content in bulb of onion, leaves of onion, soil pH, organic carbon, % total N and exchangeable K. The data obtained from the experiment were analyzed to find out the statistical significance differences among the treatments. Mean differences were adjusted by Duncan’s Multiple Range Test (DMRT) was calculated (Gomez and Gomez, 1984).

Source of Information: Journal of PSTU Vol 5 No. 2 December 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the findings of the present study it may be concluded that the nutrient content in summer onion and post harvest soils were influenced by Nitrogen (N) and potassium (K) fertilization. Both the nutrients content in summer onion and post harvest soils were increased with the increasing doses of nitrogen and potassium up to 150 kg N ha^-1and 150 kg K ha^-1. Like single effect, the interaction effects of N and K on the nutrients content in the summer onion and chemical properties of post harvest soils were considerably affected with the increasing dose. This study suggested that the farmers of this study area could provide 150 kg N ha^-1 and 150 kg K ha^-1for summer onion cultivation.

Knowledge Management: Journal