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Yield and Nutritional Changes in Brinjal Seedlings by Arbuscular Mycorrhizal Inoculation Under Different P Levels

M.A.M. Rashid
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh

M.A.H. Chowdhury
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh

M.A.H. Bhuiyan
Soil Science Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur

Abstract/ Executive Summary:

A pot trial was conducted to study the response of brinjal (Solanum melongenum L.) cv. BARI Begun-8 to different phosphorus levels (0, 15, 30, 45 and 60 kg P ha^-1) using with and without vesicular-arbuscular mycorrhizal fungus, Glomus fasciculatum during the period from November, 2007 to January, 2008 in the net house of the Department of Agricultural Chemistry, Bangladesh Agricultural University (BAU), Mymensingh. At the seedling stage of brinjal, dry biomass and N, P, K, S, Ca, Mg, B, Zn, Mn, Cu and Na uptake differed significantly between inoculated and uninoculated control plants. Total biomass and all the above nutrient uptakes increased with increasing P level in uninoculated plants @ 30 kg P ha^-1, except for Zn and Cu which increased up to 15 kg P ha^-1 and further higher levels of P, showed decreasing trend. The positive effect of AM (G. fasciculatum), inoculation and along with P application up to inoculated with AM when applied phosphorus @ 15 and 30 kg ha^-1 and then after decreased with increasing P level above 30 kg P ha^-1, due to decreased percent root colonization and spore count at higher P levels. Thus the result suggested that mycorrhiza work better under low level of P.

Keywords: AM (Glomus fasciculatum), Macro and micro nutrients, Brinjal.

Location: Net house in the BAU, Mymensingh

Start Date: 00-11-2007

End Date: 00-01-2008

Program Area: Crop-Soil-Water Management

Commodity: Brinjal

Objectives:

1. To evaluate the effect of AM and P on the total dry matter yield, nutrient contents and their uptake by brinjal seedlings and 2. To examine the efficiency of AM with various levels of P in raising brinjal seedlings.

Methodology:

The experiment was conducted in a net house in the BAU, Mymensingh. The experiment was laid out in a completely randomized design (CRD), with three replicates and ten treatments. Each treatment consisted of five P rates i.e., P₀ = 0, P₁ = 7.5, P₂ = 15.0, P₃ = 22.5, P₄ = 30.0 mg P kg^-1 soil (from TSP) in combination with and without AM inoculation. Brinjal (Solanum melongenum L.) cv. BARI Begun-8 was used as plant material for the experiment. Seeds were collected from Horticultural Research Centre, BARI, Joydebpur. The inoculum of AM fungi (G. fasciculatum) was collected from trap crop of sorghum as infected root with soil which was preserved in the net house of Soil Science Division of the Bangaladesh Agricultural Reasearch Institute (BARI), Joydebpur, Gazipur. To conduct the experiment, (35 x 25 cm²) polyethylene bags were collected and each polyethylene was poured with 3 kg finely ground mixer of soil and well decomposed cowdung with the ratio of 5:1. Urea, muriate of potash and gypsum were applied according to the Fertilizer Recommendation Guide. Half amount of urea and full doses of other fertilizers were applied one day before seeds sowing. The rest half amount of urea was applied at 20 days after sowing (DAS). Triple superphosphate was applied as per treatments of the experiment dividing into five doses (0, 15, 30, 45, and 60 kg ha^-1). Soil based AM inoculum containing about 200 spores (Measured by wet sieving and decanting method under stereomicroscope) and infected root pieces was used in the seed furrows of about 3 cm depth at the rate of 15 g kg^-1 soil. Then 20 seeds were sown on 10 November 2007 in each furrow on AM inoculum and covered them by side soil. After sowing the seed, the soil was saturated with water. The seedlings were harvested at full maturity on 15 December 2007 after 35 days of germination. The harvesting was done by uprooting the whole plants. The soil adhering to the roots could be easily thrown away by jerking and washing with water. Weights of the plants with attached roots and without roots were taken immediately after harvesting and after oven dried to determine total dry matter yield. Total N, P, K, Ca, Mg, S and micro-nutrient contents, and their uptakes of whole plant by brinjal seedlings were determined. The data were analysed using the appropriate statistical tools.

Source of Information: J. Agrofor. Environ. 2 (2): 15-21, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The positive effect of mycorrhizal inoculation and along with P application up to inoculated with AM when applied phosphorus @ 15 and 30 kg ha^-1 and then after decreased with increasing P level above 30 kg Pha^-1. The study ventilated that AM use as a biofertilizer for production of brinjal seedlings reduced 50% phosphatic fertilizer as recommended dose. Further studies may be under taken to explore the possibility of more effective for tomato and brinjal up to yield as well as for other crops to minimize the use of costly phosphatic fertilizer in the country. Finally repeated field trials also necessary to use them as biophosphorus fertilizer.

Knowledge Management: Journal