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Influences of Phosphorus and Potassium on Nutritive Value and Shelf Life of Sub-tropical Strawberry

M. J. Rezowana
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

H. Sultana
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. M. Hossain
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

A. J. M. S. Karim
Department of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

E. Kayesh
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. S. Biswas*
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

An adequate management of nutrient elements is crucial to guarantee plant growth and development as well as for longer shelf life of fruit. The present experiment was conducted to observe the response of various combinations of phosphorus (P) and potassium (K)fertilization on the nutritional quality and shelf life of subtropical strawberry. The first part of the experiment for nutritive value was designed in Randomized Complete Block Design (RCBD) including seven combined doses of P and K fertilizer (viz., T1 - P0 K100 kg/ha, T2 - P25 K100 kg/ha, T3 - P50 K100 kg/ha, T4 - P75 K100 kg/ha, T5 - P50 K0 kg/ha, T6 - P50 K50 kg/ha and T7 - P50 K150 kg/ha)with three replications. In the second part, the shelf life was evaluated byfactorialCompletely Randomized Design (CRD) with three replications. The results revealed that under fresh conditions, the maximum amount of ?- carotene (15.13 IU/100 g), TSS (13.16 %), K (0.85 %), reducing sugar (6.18 g/100 g) and total sugar (8.57 g/100 g) was recorded in T7. The highest amount of non-reducing sugar (2.51 g/100 g) and P (0.08 %) were found in T4andascorbic acid (55.94 mg/100 g) in T3. In terms of shelf life and packaging conditions, treatment T4 showed the longest shelf life (25.33 days) compared to others at 4⁰C with polyethylene package. Therefore, P50 K150 kg/ha (T7) showed better performance for most of the nutritive values and P75 K100 kg/ha (T4) was better for enhancing the shelf life of strawberries. However, further investigation is necessary to determine whether nonreducing sugar or P content is related to the extended shelf life of strawberries.

Keywords: Strawberry, Phosphorus, Potassium, Nutritional value, Shelf life

Location: Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur-1706.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Strawberry, Phosphorus, Potash

Objectives:

Strawberry is one of the most sensitive plants in horticultural production and fruits have a very short shelf-life and senescent period due to their high degree of perishability and infection caused by several pathogens that can rapidly reduce fruit quality. Hence, an adequate amount of phosphorus and potassium is required to provide high-quality postharvest attributes needed for longer shelf life. Considering the above facts, the present study was, therefore, undertaken to observe the influence of phosphorus and potassium fertilization on the nutritive value and shelf life of subtropical strawberry

Methodology:

The experiment was conducted at the farm and laboratory of the Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur-1706. Seven different doses of triple superphosphate (TSP) and muriate of potash (MP) representing the treatments (T1 - P0 K100 kg/ha, T2 - P25 K100 kg/ha, T3 - P50 K100 kg/ha, T4 - P75 K100 kg/ha, T5 - P50 K0 kg/ha, T6 - P50 K50 kg/ha and T7 - P50 K150 kg/ha) of the experiment were used in the experiment as the source of P and K nutrients, respectively. The field experiment was designed in accordance with randomized Complete Block Design (RCBD) and the laboratory experiment was designed with factorial Completely Randomized Design (CRD) with three replications. Freshly harvested strawberry fruits were sampled for nutritional quality assessment. Then the fruits were packed with polyethylene pack and plastic punnet and kept at different temperature (room temperature, refrigerated condition at 4⁰C and moderate condition at 12⁰C)keeping the packs unsealed for shelf-life determination. During investigation, different fruit quality parameters were evaluated. Ascorbic acid content (mg/100g) in fruit was determined by titration method described by [6]. ß-Carotene content (mg/100g) was measured spectrophotometrically and calculated by the following formula:

ß-Carotene (mg/100g) = 0.216(OD₆₆₃)+0.452(OD₄₅₃)- 1.22(OD₆₄₅) - 0.304(OD₅₀₅) Where, OD indicates optical density.

Source of Information: IOSR Journal of Agriculture and Veterinary Science (IOSR-JAVS) e-ISSN: 2319-2380, p-ISSN: 2319-2372. Volume 11, Issue 8 Ver. I (August 2018), PP 06-10

Article Link (Online Journal): DOI: 10.9790/2380-1108010610

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, it can be concluded that application of phosphorus @ 50 kg/ha and potassium @ 150 kg/ha gave the highest nutritional value such as ß-carotene, TSS, K content, reducing sugar, total sugar content etc. in strawberry. On the contrary, phosphorus @ 75 kg/ha and potassium @ 100 kg/ha accumulated the highest amount of non-reducing and P content, simultaneously the following treatment showed extended shelf life of strawberry.

Knowledge Management: Journal