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Effect of Concentrations and Time of Application of Naa on Malformation of Mango

M. N. A. Chowdhury
Spices Research Center, Shibganj, Bogra

M. A. Rahim
Department of Horticulture, Bangladesh Agricultural University, Mymensingh,

Abstract/ Executive Summary:

The experiment was carried out for controlling mango malformation and achieving higher yield and quality of mango cv. Amrapali at the Germplasm Centre of the Fruit Tree Improvement Project (GPC-FTIP), Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from July 2000 to July 2001. The treatments were different concentration of NAA viz. 100, 200 and 300 ppm and spray times viz. 1st week of October and 1st week of November. The highest sex ratio (1:5.33) was found in 1st November and the lowest (1:6.02) was found in 1St October spray. It was found that the highest (8.49 t/ha) yield was recorded from 1st October application of NAA and the lowest (7.22 t/ha) was observed in 1st November. NAA at 200 ppm gave the highest (10.17 t/ha) yield while control treatment gave the lowest (4.65 t/ha) yield. 1st October × 200 ppm NAA produced the highest (11.39 t/ha) yield than 1St November × control (4.48 t/ha).

Keywords: Mango, NAA, Time of application, Malformation, Yield

Location: Germplasm Centre (GPC), FTIP, Department of Horticulture, BAU, Mymensingh

Start Date: 00-07-2000

End Date: 00-07-2001

Program Area: Quality and Nutrition

Commodity: Mango

Objectives:

1. To evaluate the effect of NAA and its time of application to control malformation.

Methodology:

The experiment was carried out from July 2000 to July 2001 at Germplasm Centre (GPC), FTIP, Department of Horticulture, BAU, Mymensingh. The two-factor experiment was conducted in randomized complete block design (RCBD) with 3 replications. The treatments were different concentration of NAA viz. 100, 200 and 300 ppm and spray times viz. 1st week of October and 1st week of November. The spacing was 2.5m × 2.5m. Plants, which were severely affected by floral malformation in previous season, were selected for the treatment. Fertilizers were applied after harvest of the previous year’s fruit. The stock solution of NAA along with adhesive agent (Tween-80) was sprayed individually by hand sprayer. Three plants were sprayed with each NAA solution. Spray was done in the 1st October and 1st November. Amount of spray solution per plant was determined by spraying water in the plant. All exposed surfaces of the plants including leaves, twigs, and branches were sprayed. Data were recorded on total number of inflorescences per plant; percentage of healthy and malformed inflorescences per plant; percentage of unopened male and hermaphrodite flowers per inflorescence; sex ratio; fruit retention per inflorescence and per plant (%); total number of fruit per plant, fruit weight (g); yield/plant; yield (t/ha), benefit cost ratio and Total Soluble Solids (TSS).

Source of Information: J. Agrofor. Environ. 2(1): 1-6, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was found that the highest (8.49 t/ha) yield was recorded from 1^st October application of NAA and the lowest (7.22 t/ha) was observed in 1^st November. NAA at 200 ppm gave the highest (10.17 t/ha) yield while control treatment gave the lowest (4.65 t/ha) yield. 1^st October × 200 ppm NAA produced the highest (11.39 t/ha) yield than 1^St November × control (4.48 t/ha).

Knowledge Management: Journal